mirror of
https://github.com/Russell-S-Harper/COMMON.git
synced 2024-06-14 21:29:36 +00:00
101 lines
2.2 KiB
C
101 lines
2.2 KiB
C
#include <stdint.h>
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#include <stdio.h>
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#include "emulator.h"
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/* Register I6 maintains common status */
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#define _R0 0xb0
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#define _R8 0xd0
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#define _I0 0xd8
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#define _I6 0xf0
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#define _I7 0xf4
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#define _I8 0xf8
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/* (dd cc bb aa) aa: index for register stack RS / ccbb: program counter PC / dd: flags F UONPZLGE */
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#define _RSI _I6 /* register stack index */
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#define _PCL _RSI + 1 /* program counter low */
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#define _PCH _PCL + 1 /* program counter high */
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#define _F _PCH + 1 /* flags */
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#define _PC _PCL /* program counter */
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/* register I7 maintains locations of code and allocated memory */
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#define _CRL _I7 /* code low and high bytes */
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#define _CRH _CRL + 1
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#define _ARL _CRH + 1 /* allocated low and high bytes */
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#define _ARH _ARL + 1
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#define _CR _CRL /* code memory address */
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#define _AR _ARL /* allocated memory address */
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#define CODE 0xaa /* to indicate CODE section */
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#define DATA 0x55 /* to indicate DATA section */
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uint8_t memory[65536];
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uint8_t read6502(uint16_t address) {
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return memory[address];
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}
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void write6502(uint16_t address, uint8_t value) {
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memory[address] = value;
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}
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void hook() {
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int i, j;
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printf("\n%04x %u %u\n", pc, instructions, clockticks6502);
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for (i = _R0; i < _R8; i += 4) {
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printf("R%d: ", (i - _R0) / 4);
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for (j = 0; j < 4; ++j)
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printf("%02x ", memory[i + j]);
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if (((i - _R0) / 4) % 4 == 3)
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printf("\n");
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}
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for (i = _I0; i < _I8; i += 4) {
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printf("I%d: ", (i - _I0) / 4);
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for (j = 0; j < 4; ++j)
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printf("%02x ", memory[i + j]);
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if (((i - _I0) / 4) % 4 == 3)
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printf("\n");
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}
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}
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int main() {
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uint8_t header[5];
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while (fread(header, sizeof(header), 1, stdin))
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{
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uint8_t type = header[0];
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uint16_t index = header[1] + (header[2] << 8);
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uint16_t length = header[3] + (header[4] << 8);
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printf("\n%x %04x %u\n", type, index, length);
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if (fread(memory + index, length, 1, stdin))
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{
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switch (type) {
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case CODE:
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memory[_CRL] = header[1];
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memory[_CRH] = header[2];
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break;
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case DATA:
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memory[_ARL] = header[1];
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memory[_ARH] = header[2];
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break;
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}
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}
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}
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memory[_PCL] = memory[_CRL];
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memory[_PCH] = memory[_CRH];
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hookexternal(hook);
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reset6502();
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do
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step6502();
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while (memory[pc]);
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return 0;
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}
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