35 lines
891 B
C
35 lines
891 B
C
#include <stdio.h>
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#include <stdint.h>
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#include <string.h>
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uint8_t mem[0x10000];
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void cpu6502_dump(
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uint16_t pc, uint8_t a, uint8_t x, uint8_t y, uint8_t sp, uint8_t sr) {
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printf("*** dump *** PC=$%04x A=$%02x X=$%02x Y=$%02x SP=$%02x "
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"NV-B_DIZC=%d%d-%d_%d%d%d%d\n",
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pc, a, x, y, sp, (sr >> 7) & 1, (sr >> 6) & 1, (sr >> 4) & 1,
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(sr >> 3) & 1, (sr >> 2) & 1, (sr >> 1) & 1, sr & 1);
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}
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uint8_t cpu6502_load(uint16_t addr) {
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printf("load $%04x => $%02x\n", addr, mem[addr]);
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return mem[addr];
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}
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void cpu6502_store(uint16_t addr, uint8_t data) {
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printf("store $%04x <= $%02x\n", addr, data);
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mem[addr] = data;
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}
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int main(int argc, char** argv) {
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FILE* fp = fopen("applebasic.rom", "rb");
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memset(mem, 0, 0x10000);
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fread(&mem[0xd000], 1, 0x3000, fp);
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fclose(fp);
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cpu6502_reset();
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printf("quit: $%04x\n", cpu6502_run());
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return 0;
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}
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