1051 lines
No EOL
35 KiB
C
1051 lines
No EOL
35 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h> // for the uintx_t's
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#include <unistd.h> // for sleep
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#include <gtk/gtk.h>
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// gcc emulator_shell.c `pkg-config --cflags --libs gtk+-3.0` -o emulator
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#define FREQUENCY 500
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void keyDown(uint8_t key);
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void keyUp(uint8_t key);
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//===== GTK SETUP =====
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static gboolean on_key_press(GtkWidget *widget, GdkEventKey *event, gpointer user_data)
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{
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switch (event->keyval)
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{
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case GDK_KEY_Left:
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// Code to be executed when the left arrow key is pressed down
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g_print("Left arrow key pressed down\n");
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keyDown(1);
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break;
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case GDK_KEY_Right:
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// Code to be executed when the right arrow key is pressed down
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g_print("Right arrow key pressed down\n");
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keyDown(2);
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break;
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case GDK_KEY_space:
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// Code to be executed when the space bar is pressed down
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g_print("Space bar pressed down\n");
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keyDown(3);
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break;
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case GDK_KEY_c:
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// Code to be executed when the 'c' key is pressed down
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g_print("'c' key pressed down\n");
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keyDown(0);
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break;
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case GDK_KEY_s:
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// Code to be executed when the 's' key is pressed down
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g_print("'s' key pressed down\n");
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keyDown(4);
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break;
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}
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return FALSE;
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}
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static gboolean on_key_release(GtkWidget *widget, GdkEventKey *event, gpointer user_data)
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{
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switch (event->keyval)
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{
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case GDK_KEY_Left:
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// Code to be executed when the left arrow key is released
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g_print("Left arrow key released\n");
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keyUp(1);
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break;
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case GDK_KEY_Right:
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// Code to be executed when the right arrow key is released
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g_print("Right arrow key released\n");
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keyUp(2);
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break;
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case GDK_KEY_space:
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// Code to be executed when the space bar is pressed down
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g_print("Space bar released\n");
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keyUp(3);
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break;
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case GDK_KEY_c:
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// Code to be executed when the 'c' key is pressed down
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g_print("'c' key released\n");
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keyUp(0);
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break;
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case GDK_KEY_s:
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// Code to be executed when the 's' key is pressed down
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g_print("'s' key released\n");
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keyUp(4);
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break;
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}
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return FALSE;
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}
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//===== EMULATOR SETUP =====
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uint8_t in_port; //GLOBALLY DECLARED
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char which_interrupt = 1; //GLOBALLY DECLARED
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typedef struct ConditionCodes {
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//bitfields for condition codes
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//the number following the variables sets the number of bits
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uint8_t z:1;
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uint8_t s:1;
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uint8_t p:1;
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uint8_t cy:1;
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uint8_t ac:1;
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uint8_t pad:3;
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} ConditionCodes;
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typedef struct State8080 {
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uint8_t a;
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uint8_t b;
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uint8_t c;
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uint8_t d;
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uint8_t e;
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uint8_t h;
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uint8_t l;
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uint16_t sp;
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uint16_t pc;
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uint8_t *memory;
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ConditionCodes cc;
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uint8_t int_enable;
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uint8_t shift_offset;
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uint8_t shift0;
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uint8_t shift1;
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} State8080;
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unsigned char cycles8080[] = {
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4, 10, 7, 5, 5, 5, 7, 4, 4, 10, 7, 5, 5, 5, 7, 4, //0x00..0x0f
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4, 10, 7, 5, 5, 5, 7, 4, 4, 10, 7, 5, 5, 5, 7, 4, //0x10..0x1f
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4, 10, 16, 5, 5, 5, 7, 4, 4, 10, 16, 5, 5, 5, 7, 4, //etc
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4, 10, 13, 5, 10, 10, 10, 4, 4, 10, 13, 5, 5, 5, 7, 4,
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5, 5, 5, 5, 5, 5, 7, 5, 5, 5, 5, 5, 5, 5, 7, 5, //0x40..0x4f
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5, 5, 5, 5, 5, 5, 7, 5, 5, 5, 5, 5, 5, 5, 7, 5,
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5, 5, 5, 5, 5, 5, 7, 5, 5, 5, 5, 5, 5, 5, 7, 5,
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7, 7, 7, 7, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 7, 5,
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4, 4, 4, 4, 4, 4, 7, 4, 4, 4, 4, 4, 4, 4, 7, 4, //0x80..8x4f
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4, 4, 4, 4, 4, 4, 7, 4, 4, 4, 4, 4, 4, 4, 7, 4,
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4, 4, 4, 4, 4, 4, 7, 4, 4, 4, 4, 4, 4, 4, 7, 4,
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4, 4, 4, 4, 4, 4, 7, 4, 4, 4, 4, 4, 4, 4, 7, 4,
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11, 10, 10, 10, 17, 11, 7, 11, 11, 10, 10, 10, 10, 17, 7, 11, //0xc0..0xcf
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11, 10, 10, 10, 17, 11, 7, 11, 11, 10, 10, 10, 10, 17, 7, 11,
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11, 10, 10, 18, 17, 11, 7, 11, 11, 5, 10, 5, 17, 17, 7, 11,
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11, 10, 10, 4, 17, 11, 7, 11, 11, 5, 10, 4, 17, 17, 7, 11,
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};
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//===== EMULATOR FUNCTIONS =====
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int disassemble8080(unsigned char* code) {
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int opbytes = 1;
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switch (*code) {
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case 0x00: printf("NOP"); break;
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case 0x01: printf("LXI B,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x02: printf("STAX B"); break;
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case 0x03: printf("INX B"); break;
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case 0x04: printf("INR B"); break;
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case 0x05: printf("DCR B"); break;
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case 0x06: printf("MVI B,#$%02x", code[1]); opbytes = 2; break;
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case 0x07: printf("RLC"); break;
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case 0x08: printf("NOP"); break;
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case 0x09: printf("DAD B"); break;
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case 0x0a: printf("LDAX B"); break;
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case 0x0b: printf("DCX B"); break;
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case 0x0c: printf("INR C"); break;
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case 0x0d: printf("DCR C"); break;
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case 0x0e: printf("MVI C,#$%02x", code[1]); opbytes = 2; break;
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case 0x0f: printf("RRC"); break;
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case 0x10: printf("NOP"); break;
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case 0x11: printf("LXI D,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x12: printf("STAX D"); break;
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case 0x13: printf("INX D"); break;
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case 0x14: printf("INR D"); break;
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case 0x15: printf("DCR D"); break;
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case 0x16: printf("MVI D,#$%02x", code[1]); opbytes = 2; break;
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case 0x17: printf("RAL"); break;
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case 0x18: printf("NOP"); break;
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case 0x19: printf("DAD D"); break;
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case 0x1a: printf("LDAX D"); break;
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case 0x1b: printf("DCX D"); break;
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case 0x1c: printf("INR E"); break;
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case 0x1d: printf("DCR E"); break;
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case 0x1e: printf("MVI E,#$%02x", code[1]); opbytes = 2; break;
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case 0x1f: printf("RAR"); break;
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case 0x20: printf("NOP"); break;
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case 0x21: printf("LXI H,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x22: printf("SHLD $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x23: printf("INX H"); break;
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case 0x24: printf("INR H"); break;
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case 0x25: printf("DCR H"); break;
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case 0x26: printf("MVI H,#$%02x", code[1]); opbytes = 2; break;
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case 0x27: printf("DAA"); break;
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case 0x28: printf("NOP"); break;
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case 0x29: printf("DAD H"); break;
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case 0x2a: printf("LHLD $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x2b: printf("DCX H"); break;
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case 0x2c: printf("INR L"); break;
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case 0x2d: printf("DCR L"); break;
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case 0x2e: printf("MVI L,#$%02x", code[1]); opbytes = 2; break;
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case 0x2f: printf("CMA"); break;
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case 0x30: printf("NOP"); break;
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case 0x31: printf("LXI SP,#$%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x32: printf("STA $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x33: printf("INX SP"); break;
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case 0x34: printf("INR M"); break;
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case 0x35: printf("DCR M"); break;
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case 0x36: printf("MVI M,#$%02x", code[1]); opbytes = 2; break;
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case 0x37: printf("STC"); break;
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case 0x38: printf("NOP"); break;
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case 0x39: printf("DAD SP"); break;
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case 0x3a: printf("LDA $%02x%02x", code[2], code[1]); opbytes = 3; break;
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case 0x3b: printf("DCX SP"); break;
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case 0x3c: printf("INR A"); break;
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case 0x3d: printf("DCR A"); break;
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case 0x3e: printf("MVI A,#$%02x", code[1]); opbytes = 2; break;
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case 0x3f: printf("CMC"); break;
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case 0x40: printf("MOV B,B"); break;
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case 0x41: printf("MOV B,C"); break;
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case 0x42: printf("MOV B,D"); break;
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case 0x43: printf("MOV B,E"); break;
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case 0x44: printf("MOV B,H"); break;
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case 0x45: printf("MOV B,L"); break;
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case 0x46: printf("MOV B,M"); break;
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case 0x47: printf("MOV B,A"); break;
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case 0x48: printf("MOV C,B"); break;
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case 0x49: printf("MOV C,C"); break;
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case 0x4a: printf("MOV C,D"); break;
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case 0x4b: printf("MOV C,E"); break;
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case 0x4c: printf("MOV C,H"); break;
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case 0x4d: printf("MOV C,L"); break;
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case 0x4e: printf("MOV C,M"); break;
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case 0x4f: printf("MOV C,A"); break;
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case 0x50: printf("MOV D,B"); break;
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case 0x51: printf("MOV D,C"); break;
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case 0x52: printf("MOV D,D"); break;
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case 0x53: printf("MOV D,E"); break;
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case 0x54: printf("MOV D,H"); break;
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case 0x55: printf("MOV D,L"); break;
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case 0x56: printf("MOV D,M"); break;
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case 0x57: printf("MOV D,A"); break;
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case 0x58: printf("MOV E,B"); break;
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case 0x59: printf("MOV E,C"); break;
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case 0x5a: printf("MOV E,D"); break;
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case 0x5b: printf("MOV E,E"); break;
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case 0x5c: printf("MOV E,H"); break;
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case 0x5d: printf("MOV E,L"); break;
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case 0x5e: printf("MOV E,M"); break;
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case 0x5f: printf("MOV E,A"); break;
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case 0x60: printf("MOV H,B"); break;
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case 0x61: printf("MOV H,C"); break;
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case 0x62: printf("MOV H,D"); break;
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case 0x63: printf("MOV H,E"); break;
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case 0x64: printf("MOV H,H"); break;
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case 0x65: printf("MOV H,L"); break;
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case 0x66: printf("MOV H,M"); break;
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case 0x67: printf("MOV H,A"); break;
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case 0x68: printf("MOV L,B"); break;
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case 0x69: printf("MOV L,C"); break;
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case 0x6a: printf("MOV L,D"); break;
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case 0x6b: printf("MOV L,E"); break;
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case 0x6c: printf("MOV L,H"); break;
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case 0x6d: printf("MOV L,L"); break;
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case 0x6e: printf("MOV L,M"); break;
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case 0x6f: printf("MOV L,A"); break;
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case 0x70: printf("MOV M,B"); break;
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case 0x71: printf("MOV M,C"); break;
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case 0x72: printf("MOV M,D"); break;
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case 0x73: printf("MOV M,E"); break;
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case 0x74: printf("MOV M,H"); break;
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case 0x75: printf("MOV M,L"); break;
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case 0x76: printf("HLT"); break;
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case 0x77: printf("MOV M,A"); break;
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case 0x78: printf("MOV A,B"); break;
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case 0x79: printf("MOV A,C"); break;
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case 0x7a: printf("MOV A,D"); break;
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case 0x7b: printf("MOV A,E"); break;
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case 0x7c: printf("MOV A,H"); break;
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case 0x7d: printf("MOV A,L"); break;
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case 0x7e: printf("MOV A,M"); break;
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case 0x7f: printf("MOV A,A"); break;
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case 0x80: printf("ADD B"); break;
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case 0x81: printf("ADD C"); break;
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case 0x82: printf("ADD D"); break;
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case 0x83: printf("ADD E"); break;
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case 0x84: printf("ADD H"); break;
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case 0x85: printf("ADD L"); break;
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case 0x86: printf("ADD M"); break;
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case 0x87: printf("ADD A"); break;
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case 0x88: printf("ADC B"); break;
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case 0x89: printf("ADC C"); break;
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case 0x8a: printf("ADC D"); break;
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case 0x8b: printf("ADC E"); break;
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case 0x8c: printf("ADC H"); break;
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case 0x8d: printf("ADC L"); break;
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case 0x8e: printf("ADC M"); break;
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case 0x8f: printf("ADC A"); break;
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case 0x90: printf("SUB B"); break;
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case 0x91: printf("SUB C"); break;
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case 0x92: printf("SUB D"); break;
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case 0x93: printf("SUB E"); break;
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case 0x94: printf("SUB H"); break;
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case 0x95: printf("SUB L"); break;
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case 0x96: printf("SUB M"); break;
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case 0x97: printf("SUB A"); break;
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case 0x98: printf("SBB B"); break;
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case 0x99: printf("SBB C"); break;
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case 0x9a: printf("SBB D"); break;
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case 0x9b: printf("SBB E"); break;
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case 0x9c: printf("SBB H"); break;
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case 0x9d: printf("SBB L"); break;
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case 0x9e: printf("SBB M"); break;
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case 0x9f: printf("SBB A"); break;
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case 0xa0: printf("ANA B"); break;
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case 0xa1: printf("ANA C"); break;
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case 0xa2: printf("ANA D"); break;
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case 0xa3: printf("ANA E"); break;
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case 0xa4: printf("ANA H"); break;
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case 0xa5: printf("ANA L"); break;
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case 0xa6: printf("ANA M"); break;
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case 0xa7: printf("ANA A"); break;
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case 0xa8: printf("XRA B"); break;
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case 0xa9: printf("XRA C"); break;
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case 0xaa: printf("XRA D"); break;
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case 0xab: printf("XRA E"); break;
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case 0xac: printf("XRA H"); break;
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case 0xad: printf("XRA L"); break;
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case 0xae: printf("XRA M"); break;
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case 0xaf: printf("XRA A"); break;
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case 0xb0: printf("ORA B"); break;
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case 0xb1: printf("ORA C"); break;
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case 0xb2: printf("ORA D"); break;
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case 0xb3: printf("ORA E"); break;
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case 0xb4: printf("ORA H"); break;
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case 0xb5: printf("ORA L"); break;
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case 0xb6: printf("ORA M"); break;
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case 0xb7: printf("ORA A"); break;
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case 0xb8: printf("CMP B"); break;
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case 0xb9: printf("CMP C"); break;
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case 0xba: printf("CMP D"); break;
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case 0xbb: printf("CMP E"); break;
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case 0xbc: printf("CMP H"); break;
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case 0xbd: printf("CMP L"); break;
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case 0xbe: printf("CMP M"); break;
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case 0xbf: printf("CMP A"); break;
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case 0xc0: printf("RNZ"); break;
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case 0xc1: printf("POP B"); break;
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case 0xc2: printf("JNZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xc3: printf("JMP $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xc4: printf("CNZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xc5: printf("PUSH B"); break;
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case 0xc6: printf("ADI,#$%02x", code[1]); opbytes = 2; break;
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case 0xc7: printf("RST 0"); break;
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case 0xc8: printf("RZ"); break;
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case 0xc9: printf("RET"); break;
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case 0xca: printf("JZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xcb: printf("NOP"); break;
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case 0xcc: printf("CZ $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xcd: printf("CALL $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xce: printf("ACI,#$%02x", code[1]); opbytes = 2; break;
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case 0xcf: printf("RST 1"); break;
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case 0xd0: printf("RNC"); break;
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case 0xd1: printf("POP D"); break;
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case 0xd2: printf("JNC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xd3: printf("OUT #$%02x", code[1]); opbytes = 2; break;
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case 0xd4: printf("CNC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xd5: printf("PUSH D"); break;
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case 0xd6: printf("SUI,#$%02x", code[1]); opbytes = 2; break;
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case 0xd7: printf("RST 2"); break;
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case 0xd8: printf("RC"); break;
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case 0xd9: printf("NOP"); break;
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case 0xda: printf("JC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xdb: printf("IN #$%02x", code[1]); opbytes = 2; break;
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case 0xdc: printf("CC $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xdd: printf("NOP"); break;
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case 0xde: printf("SBI,#$%02x", code[1]); opbytes = 2; break;
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case 0xdf: printf("RST 3"); break;
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case 0xe0: printf("RPO"); break;
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case 0xe1: printf("POP H"); break;
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case 0xe2: printf("JPO $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xe3: printf("XTHL"); break;
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case 0xe4: printf("CPO $%02x%02x",code[2],code[1]); opbytes = 3; break;
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case 0xe5: printf("PUSH H"); break;
|
|
case 0xe6: printf("ANI,#$%02x", code[1]); opbytes = 2; break;
|
|
case 0xe7: printf("RST 4"); break;
|
|
|
|
case 0xe8: printf("RPE"); break;
|
|
case 0xe9: printf("PCHL"); break;
|
|
case 0xea: printf("JPE $%02x%02x",code[2],code[1]); opbytes = 3; break;
|
|
case 0xeb: printf("XCHG"); break;
|
|
case 0xec: printf("CPE $%02x%02x",code[2],code[1]); opbytes = 3; break;
|
|
case 0xed: printf("NOP"); break;
|
|
case 0xee: printf("XRI,#$%02x", code[1]); opbytes = 2; break;
|
|
case 0xef: printf("RST 5"); break;
|
|
|
|
case 0xf0: printf("RP"); break;
|
|
case 0xf1: printf("POP PSW"); break;
|
|
case 0xf2: printf("JP $%02x%02x",code[2],code[1]); opbytes = 3; break;
|
|
case 0xf3: printf("DI"); break;
|
|
case 0xf4: printf("CP $%02x%02x",code[2],code[1]); opbytes = 3; break;
|
|
case 0xf5: printf("PUSH PSW"); break;
|
|
case 0xf6: printf("ORI,#$%02x", code[1]); opbytes = 2; break;
|
|
case 0xf7: printf("RST 6"); break;
|
|
|
|
case 0xf8: printf("RM"); break;
|
|
case 0xf9: printf("SPHL"); break;
|
|
case 0xfa: printf("JM $%02x%02x",code[2],code[1]); opbytes = 3; break;
|
|
case 0xfb: printf("EI"); break;
|
|
case 0xfc: printf("CM $%02x%02x",code[2],code[1]); opbytes = 3; break;
|
|
case 0xfd: printf("NOP"); break;
|
|
case 0xfe: printf("CPI,#$%02x", code[1]); opbytes = 2; break;
|
|
case 0xff: printf("RST 7"); break;
|
|
|
|
}
|
|
printf("\n");
|
|
return opbytes;
|
|
}
|
|
|
|
|
|
void unknownInstruction(State8080* state) {
|
|
printf("Error: Unknown instruction");
|
|
return exit(1);
|
|
}
|
|
|
|
int parity(int x, int size)
|
|
{
|
|
int i;
|
|
int p = 0;
|
|
x = (x & ((1<<size)-1));
|
|
for (i=0; i<size; i++)
|
|
{
|
|
if (x & 0x1) p++;
|
|
x = x >> 1;
|
|
}
|
|
return (0 == (p & 0x1));
|
|
}
|
|
|
|
void printState(State8080* state) {
|
|
printf("\tC=%d,P=%d,S=%d,Z=%d\n", state->cc.cy, state->cc.p,
|
|
state->cc.s, state->cc.z);
|
|
printf("\tA $%02x B $%02x C $%02x D $%02x E $%02x H $%02x L $%02x SP %04x\n",
|
|
state->a, state->b, state->c, state->d,
|
|
state->e, state->h, state->l, state->sp);
|
|
}
|
|
|
|
uint8_t machineIn(State8080* state, uint8_t port) {
|
|
uint8_t a;
|
|
switch(port) {
|
|
case 0:
|
|
a = 1;
|
|
break;
|
|
case 2:
|
|
a = in_port;
|
|
break;
|
|
case 3:
|
|
{
|
|
uint16_t v = (state->shift1<<8) | (state->shift0);
|
|
a = ((v >> (8-state->shift_offset)) & 0xff);
|
|
}
|
|
break;
|
|
}
|
|
return a;
|
|
}
|
|
|
|
void machineOut(State8080* state, uint8_t port, uint8_t value) {
|
|
switch(port) {
|
|
case 2:
|
|
{
|
|
state->shift_offset = value & 0x7;
|
|
} break;
|
|
case 4:
|
|
{
|
|
state->shift0 = state->shift1;
|
|
state->shift1 = value;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
int emulate8080(State8080* state) {
|
|
unsigned char *opcode = &(state->memory[state->pc]);
|
|
|
|
printf("%04x ", state->pc);
|
|
|
|
disassemble8080(opcode);
|
|
state->pc++;
|
|
|
|
switch(*opcode) {
|
|
case 0x00: break; // NOP does nothing
|
|
case 0x01: // LXI B, word
|
|
state->c = opcode[1];
|
|
state->b = opcode[2];
|
|
state->pc += 2;
|
|
break;
|
|
case 0x05: // DCR B
|
|
{
|
|
uint8_t res = state->b - 1;
|
|
state->b = res;
|
|
state->cc.z = (res == 0);
|
|
state->cc.s = (0x80 == (res & 0x80));
|
|
state->cc.p = parity(res, 8);
|
|
}
|
|
break;
|
|
case 0x06: // MVI B, byte
|
|
state->b = opcode[1];
|
|
state->pc += 1;
|
|
break;
|
|
case 0x09: // DAD B
|
|
{
|
|
uint32_t h1 = (state->h << 8) | state->l;
|
|
uint32_t bc = (state->b << 8) | state->c;
|
|
uint32_t result = h1 + bc;
|
|
state->h = (result & 0xff00) >> 8;
|
|
state->l = result & 0xff;
|
|
state->cc.cy = ((result & 0xffff0000) != 0);
|
|
}
|
|
break;
|
|
|
|
case 0x0d: // DCR C
|
|
{
|
|
uint8_t res = state->c - 1;
|
|
state->c = res;
|
|
state->cc.z = (res == 0);
|
|
state->cc.s = ((res & 0x80) == 0x80);
|
|
state->cc.p = parity(res, 8);
|
|
}
|
|
break;
|
|
case 0x0e: // MVI C, byte
|
|
state->c = opcode[1];
|
|
state->pc++;
|
|
break;
|
|
case 0x0f: // RRC
|
|
{
|
|
uint8_t x = state->a;
|
|
state->a = ((x & 1) << 7) | (x >> 1);
|
|
state->cc.cy = (1 == (x & 1));
|
|
}
|
|
break;
|
|
case 0x11: // LXI D, word
|
|
{
|
|
state->d = opcode[2];
|
|
state->e = opcode[1];
|
|
state->pc += 2;
|
|
}
|
|
break;
|
|
case 0x13: // INX D
|
|
{
|
|
state->e++;
|
|
if (state->e == 0) {
|
|
state->d++;
|
|
}}
|
|
break;
|
|
case 0x19: // DAD D
|
|
{
|
|
uint32_t h1 = (state->h << 8) | state->l;
|
|
uint32_t de = (state->d << 8) | state->e;
|
|
uint32_t result = h1 + de;
|
|
state->h = (result & 0xff00) >> 8;
|
|
state->l = result & 0xff;
|
|
state->cc.cy = ((result & 0xffff0000) != 0);
|
|
}
|
|
break;
|
|
case 0x1a: // LDAX D
|
|
{
|
|
uint16_t de = (state->d << 8) | state->e;
|
|
state->a = state->memory[de];
|
|
}
|
|
break;
|
|
|
|
case 0x21: // LXI H, word
|
|
{
|
|
state->h = opcode[2];
|
|
state->l = opcode[1];
|
|
state->pc += 2;
|
|
break;
|
|
}
|
|
case 0x23: // INX H
|
|
{
|
|
state->l++;
|
|
if (state->l == 0) {
|
|
state->h++;
|
|
}}
|
|
break;
|
|
case 0x26: // MVI H, byte
|
|
{
|
|
state->h = opcode[1];
|
|
state->pc++;
|
|
}
|
|
break;
|
|
case 0x27: // DAA
|
|
{
|
|
if ((state->a & 0x0f) > 9) {
|
|
state->a += 6;
|
|
} else if ((state->a & 0xf0) > 0x90) {
|
|
uint16_t res = (uint16_t) state->a + 0x60;
|
|
state->a = res & 0xff;
|
|
state->cc.cy = (res > 0xff);
|
|
state->cc.z = ((res & 0xff) == 0);
|
|
state->cc.s = (0x80 == (res & 0x80));
|
|
state->cc.p = parity((res & 0xff), 8);
|
|
}
|
|
}
|
|
case 0x29: // DAD H
|
|
{
|
|
uint32_t hl = (state->h << 8) | state->l;
|
|
uint32_t result = hl + hl;
|
|
state->h = (result & 0xff00) >> 8;
|
|
state->l = result & 0xff;
|
|
state->cc.cy = ((result & 0xffff0000) != 0);
|
|
}
|
|
break;
|
|
case 0x31: // LXI SP, word
|
|
state->sp = ((opcode[2] << 8) | opcode[1]);
|
|
state->pc += 2;
|
|
break;
|
|
case 0x32: // STA adress
|
|
{
|
|
uint16_t adress = (opcode[2]<<8) | (opcode[1]);
|
|
state->memory[adress] = state->a;
|
|
state->pc += 2;
|
|
}
|
|
break;
|
|
|
|
case 0x36: // MVI M, byte
|
|
{
|
|
uint16_t adress = (state->h <<8) | (state->l);
|
|
state->memory[adress] = opcode[1];
|
|
state->pc++;
|
|
}
|
|
break;
|
|
|
|
case 0x3a: // LDA adress
|
|
{
|
|
uint16_t adress = (opcode[2]<<8) | (opcode[1]);
|
|
state->a = state->memory[adress];
|
|
state->pc += 2;
|
|
}
|
|
break;
|
|
case 0x3e: // MVI A, byte
|
|
state->a = opcode[1];
|
|
state->pc++;
|
|
break;
|
|
case 0x41: // MOV B, C
|
|
state->b = state->c;
|
|
break;
|
|
case 0x42: // MOV B, D
|
|
state->b = state->d;
|
|
break;
|
|
case 0x43: // MOV B, E
|
|
state->b = state->e;
|
|
break;
|
|
case 0x56: // MOV D, M
|
|
{
|
|
uint16_t adress = (state->h<<8) | (state->l);
|
|
state->d = state->memory[adress];
|
|
}
|
|
break;
|
|
case 0x5e: // MOV E, M
|
|
{
|
|
uint16_t adress = (state->h<<8) | (state->l);
|
|
state->e = state->memory[adress];
|
|
}
|
|
break;
|
|
case 0x66: // MOV H, M
|
|
{
|
|
uint16_t adress = (state->h<<8) | (state->l);
|
|
state->h = state->memory[adress];
|
|
}
|
|
break;
|
|
case 0x6f: // MOV L, A
|
|
state->l = state->a;
|
|
break;
|
|
case 0x77: // MOV M, A
|
|
{
|
|
uint16_t adress = (state->h<<8) | (state->l);
|
|
state->memory[adress] = state->a;
|
|
}
|
|
break;
|
|
case 0x7a: // MOV A, D
|
|
state->a = state->d;
|
|
break;
|
|
case 0x7b: // MOV A, E
|
|
state->a = state->e;
|
|
break;
|
|
case 0x7c: // MOV A, H
|
|
state->a = state->h;
|
|
break;
|
|
case 0x7e: // MOV A, M
|
|
{
|
|
uint16_t adress = (state->h<<8) | (state->l);
|
|
state->a = state->memory[adress];
|
|
}
|
|
break;
|
|
case 0x80: // ADD B
|
|
{
|
|
uint16_t answer = (uint16_t) state->a + (uint16_t) state->b;
|
|
state->cc.z = ((answer & 0xff) == 0);
|
|
state->cc.s = ((answer & 0x80) != 0);
|
|
state->cc.cy = (answer > 0xff);
|
|
state->cc.p = parity(answer & 0xff, 8);
|
|
state->a = answer & 0xff;
|
|
}
|
|
break;
|
|
|
|
case 0x86: // ADD M
|
|
{
|
|
uint16_t offset = (state->h<<8) | (state->l);
|
|
uint16_t answer = (uint16_t) state->a + state->memory[offset];
|
|
state->cc.z = ((answer & 0xff) == 0);
|
|
state->cc.s = ((answer & 0x80) != 0);
|
|
state->cc.cy = (answer > 0xff);
|
|
state->cc.p = parity(answer & 0xff, 8);
|
|
state->a = answer & 0xff;
|
|
}
|
|
break;
|
|
case 0x1f: // RAR
|
|
{
|
|
uint8_t x = state->a;
|
|
state->a = (state->cc.cy << 7) | (x >> 1);
|
|
state->cc.cy = (1 == (x & 1));
|
|
}
|
|
break;
|
|
|
|
case 0xa7: // ANA A
|
|
state->a &= state->a;
|
|
state->cc.z = (state->a == 0);
|
|
state->cc.s = (0x80 == (state->a & 0x80));
|
|
state->cc.p = parity(state->a, 8);
|
|
state->cc.cy = 0;
|
|
state->cc.ac = 0;
|
|
break;
|
|
case 0xaf: // XRA A
|
|
state->a ^= state->a;
|
|
state->cc.z = (state->a == 0);
|
|
state->cc.s = (0x80 == (state->a & 0x80));
|
|
state->cc.p = parity(state->a, 8);
|
|
state->cc.cy = 0;
|
|
state->cc.ac = 0;
|
|
break;
|
|
case 0xc1: // POP B
|
|
state->c = state->memory[state->sp];
|
|
state->b = state->memory[state->sp+1];
|
|
state->sp += 2;
|
|
break;
|
|
|
|
case 0xc2: // JNZ adress
|
|
if (0 == state-> cc.z) {
|
|
state->pc = (opcode[2] << 8) | opcode[1];
|
|
} else {
|
|
state->pc += 2;
|
|
}
|
|
break;
|
|
|
|
case 0xc3: // JMP adress
|
|
state->pc = (opcode[2] << 8) | opcode[1];
|
|
break;
|
|
|
|
case 0xc5: // PUSH B
|
|
state->memory[state->sp-1] = state->b;
|
|
state->memory[state->sp-2] = state->c;
|
|
state->sp -= 2;
|
|
break;
|
|
case 0xc6: // ADI byte
|
|
{
|
|
uint16_t answer = (uint16_t) state->a + (uint16_t) opcode[1];
|
|
state->cc.z = ((state->a & 0xff) == 0);
|
|
state->cc.s = ((state->a & 0x80) == 0x80);
|
|
state->cc.cy = (state->a > 0xff);
|
|
state->cc.p = parity(state->a & 0xff, 8);
|
|
state->pc++;
|
|
}
|
|
break;
|
|
case 0xc9: // RET
|
|
state->pc = (state->memory[state->sp+1] << 8) | state->memory[state->sp];
|
|
state->sp += 2;
|
|
break;
|
|
case 0xcd: // CALL adress
|
|
{
|
|
uint16_t ret = state -> pc+2;
|
|
state->memory[state->sp-1] = (ret >> 8) & 0xff;
|
|
state->memory[state->sp-2] = (ret & 0xff);
|
|
state->sp -= 2;
|
|
state->pc = (opcode[2] << 8) | opcode[1];
|
|
}
|
|
break;
|
|
case 0xd1: // POP D
|
|
state->e = state->memory[state->sp];
|
|
state->d = state->memory[state->sp+1];
|
|
state->sp += 2;
|
|
break;
|
|
case 0xd3: // OUT byte
|
|
{
|
|
uint8_t port = opcode[1];
|
|
machineOut(state, port, 0x00); // PROBLEM: We need to pass a value to machineOUT
|
|
state->pc++;
|
|
}
|
|
break;
|
|
case 0xd5: // PUSH D
|
|
state->memory[state->sp-1] = state->d;
|
|
state->memory[state->sp-2] = state->e;
|
|
state->sp -= 2;
|
|
break;
|
|
case 0xdb: // IN byte
|
|
{
|
|
uint8_t port = opcode[1];
|
|
state->a = machineIn(state, port);
|
|
state->pc++;
|
|
}
|
|
break;
|
|
case 0xe1: // POP H
|
|
state->l = state->memory[state->sp];
|
|
state->h = state->memory[state->sp+1];
|
|
state->sp += 2;
|
|
break;
|
|
case 0xe5: // PUSH H
|
|
state->memory[state->sp-1] = state->h;
|
|
state->memory[state->sp-2] = state->l;
|
|
state->sp -= 2;
|
|
break;
|
|
|
|
case 0x2f: // CMA (NOT)
|
|
state->a = ~state->a;
|
|
break;
|
|
case 0xe6: // ANI byte
|
|
{
|
|
uint8_t x = state->a & opcode[1];
|
|
state->cc.z = (x == 0);
|
|
state->cc.s = (0x80 == (x & 0x80));
|
|
state->cc.cy = 0;
|
|
state->cc.p = parity(x, 8);
|
|
state->pc++;
|
|
}
|
|
break;
|
|
|
|
case 0xeb: // XCHG
|
|
{
|
|
uint8_t tmp = state->h;
|
|
state->h = state->d;
|
|
state->d = tmp;
|
|
tmp = state->l;
|
|
state->l = state->e;
|
|
state->e = tmp;
|
|
}
|
|
break;
|
|
|
|
case 0xf1: // POP PSW
|
|
{
|
|
state->a = state->memory[state->sp+1];
|
|
uint8_t psw = state->memory[state->sp];
|
|
state->cc.z = (0x01 == (psw & 0x01));
|
|
state->cc.s = (0x02 == (psw & 0x02));
|
|
state->cc.p = (0x04 == (psw & 0x04));
|
|
state->cc.cy = (0x08 == (psw & 0x08));
|
|
state->cc.ac = (0x10 == (psw & 0x10));
|
|
state->sp += 2;
|
|
}
|
|
break;
|
|
|
|
case 0xf5: // PUSH PSW
|
|
state->memory[state->sp-1] = state->a;
|
|
state->memory[state->sp-2] = (state->cc.z | (state->cc.s << 1) | (state->cc.p << 2) | (state->cc.cy << 3) | (state->cc.ac << 4));
|
|
state->sp -= 2;
|
|
break;
|
|
|
|
case 0xfb: // EI
|
|
state->int_enable = 1; break;
|
|
break;
|
|
|
|
case 0xfe: // CPI byte
|
|
{
|
|
uint8_t x = state->a - opcode[1];
|
|
state->cc.z = (x == 0);
|
|
state->cc.s = (0x80 == (x & 0x80));
|
|
state->cc.cy = (state->a < opcode[1]);
|
|
state->cc.p = parity(x, 8);
|
|
state->pc++;
|
|
}
|
|
break;
|
|
|
|
default: unknownInstruction(state); break;
|
|
}
|
|
printState(state);
|
|
return cycles8080[*opcode];
|
|
}
|
|
|
|
void generateInterrupt(State8080* state, int interrupt_num)
|
|
{
|
|
//perform "PUSH PC"
|
|
state->memory[state->sp-1] = ((state->pc & 0xFF00) >> 8);
|
|
state->memory[state->sp-2] = (state->pc & 0xff);
|
|
state->sp -= 2;
|
|
|
|
//Set the PC to the low memory vector.
|
|
|
|
state->pc = 8 * interrupt_num;
|
|
state->int_enable = 0;
|
|
}
|
|
|
|
|
|
void read_Space_Invaders_ROM(State8080* state, const char* filename, int offset) {
|
|
//Works exclusively with the memory system of Space Invaders
|
|
FILE* file = fopen(filename, "rb");
|
|
if (file == NULL) {
|
|
printf("Issue opening the file.\n");
|
|
exit(1);
|
|
}
|
|
//Get the file size and read it into a memory buffer
|
|
fseek(file, 0L, SEEK_END);
|
|
int fsize = ftell(file);
|
|
fseek(file, 0L, SEEK_SET);
|
|
|
|
uint8_t *buffer = &state->memory[offset];
|
|
|
|
fread(buffer, fsize, 1, file);
|
|
fclose(file);
|
|
}
|
|
|
|
void keyDown(uint8_t key)
|
|
{
|
|
switch(key) {
|
|
case 0: // COIN
|
|
in_port |= 0x1;
|
|
break;
|
|
case 1: // LEFT
|
|
in_port |= 0x20;
|
|
break;
|
|
case 2: // RIGHT
|
|
in_port |= 0x40;
|
|
break;
|
|
case 3: // FIRE
|
|
in_port |= 0x10;
|
|
break;
|
|
case 4: // START
|
|
in_port |= 0x04;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void keyUp( uint8_t key)
|
|
{
|
|
switch(key) {
|
|
case 0: // COIN
|
|
in_port &= ~0x1;
|
|
break;
|
|
case 1: // LEFT
|
|
in_port &= ~0x20;
|
|
break;
|
|
case 2: // RIGHT
|
|
in_port &= ~0x40;
|
|
break;
|
|
case 3: // FIRE
|
|
in_port &= ~0x10;
|
|
break;
|
|
case 4: // START
|
|
in_port &= ~0x04;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void simulateNanoseconds(unsigned int numNanoseconds)
|
|
{
|
|
struct timespec sleepTime;
|
|
sleepTime.tv_sec = 0;
|
|
sleepTime.tv_nsec = numNanoseconds;
|
|
|
|
// Pause the program execution for the specified duration
|
|
nanosleep(&sleepTime, NULL);
|
|
}
|
|
|
|
|
|
int main (int argc, char *argv[]) {
|
|
|
|
// GTK INIT
|
|
gtk_init(&argc, &argv);
|
|
GtkWidget *window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
|
|
g_print("Test\n");
|
|
g_signal_connect(window, "key-press-event", G_CALLBACK(on_key_press), NULL);
|
|
g_signal_connect(window, "key-release-event", G_CALLBACK(on_key_release), NULL);
|
|
gtk_widget_show(window);
|
|
|
|
|
|
// EMULATOR INIT
|
|
|
|
State8080 *state = (State8080*) calloc(1, sizeof(State8080)); //memset obsolte with calloc
|
|
state->cc.z = 1;
|
|
state->cc.s = 1;
|
|
state->cc.p = 1;
|
|
state->cc.cy = 0;
|
|
state->cc.ac = 1;
|
|
state->pc = 0;
|
|
state->memory = malloc(0x10000);
|
|
|
|
read_Space_Invaders_ROM(state, "ROM/invaders.h", 0);
|
|
read_Space_Invaders_ROM(state, "ROM/invaders.g", 0x800);
|
|
read_Space_Invaders_ROM(state, "ROM/invaders.f", 0x1000);
|
|
read_Space_Invaders_ROM(state, "ROM/invaders.e", 0x1800);
|
|
gtk_main();
|
|
|
|
|
|
|
|
int i = 0;
|
|
char done = 0;
|
|
int counter;
|
|
int total_count = 0;
|
|
|
|
while (!done) {
|
|
counter = emulate8080(state);
|
|
total_count += counter;
|
|
|
|
i++;
|
|
simulateNanoseconds(FREQUENCY * counter); // EMULATION OF THE PROCESSOR ŠPEED
|
|
if ((total_count > 16000000) && (state->int_enable)) //1/60 second has elapsed
|
|
{
|
|
// draw_screen(state);
|
|
if (which_interrupt == 2) {
|
|
generateInterrupt(state, 2); //interrupt 2
|
|
total_count = 0;
|
|
which_interrupt = 1;
|
|
} else {
|
|
generateInterrupt(state, 1); //interrupt 0
|
|
total_count = 0;
|
|
which_interrupt = 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
free(state->memory);
|
|
free(state);
|
|
return 0;
|
|
|
|
} |