101 lines
3.8 KiB
C
101 lines
3.8 KiB
C
#include <fcntl.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <malloc.h>
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#include <string.h>
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#include <sys/mman.h>
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extern uint32_t instructions;
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extern void reset6502(void);
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extern void step6502(void);
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uint8_t *ram, *screen, *a000, *b000, *c000, *d000, *e000, *f000;
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uint8_t read6502(uint16_t address) {
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if (address == 0xf27e) {
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printf("DONE\n");
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exit(0);
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}
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uint8_t value = 0x00;
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if (address < 0x4000) {
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// emulate memory error in uppermost page
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if (address >= 0x3ff0) {
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value = ram[address] & 0xf7;
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} else {
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value = ram[address];
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}
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0x8000 && address <= 0x8fff) {
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// screen buffer is mirrored 4 times, discard upper 2 bytes
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value = screen[address & 0x03ff];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0xa000 && address <= 0xafff) {
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value = a000[address-0xa000];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0xb000 && address <= 0xbfff) {
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value = b000[address-0xb000];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0xc000 && address <= 0xcfff) {
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value = c000[address-0xc000];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0xd000 && address <= 0xdfff) {
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value = d000[address-0xd000];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0xe000 && address <= 0xe7ff) {
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value = e000[address-0xe000];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else if (address >= 0xf000) {
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value = f000[address-0xf000];
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printf("%08x: READ %04x -> %02x\n", instructions, address, value);
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} else {
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printf("%08x: READ %04x -> not implemented\n", instructions, address);
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}
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return value;
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}
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void write6502(uint16_t address, uint8_t value) {
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if (address < 0x4000) {
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printf("%08x: WRITE %04x <- %02x\n", instructions, address, value);
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ram[address] = value;
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} else if (address >= 0x800 && address <= 0x8fff) {
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printf("%08x: WRITE %04x <- %02x, SCREEN(%d,%d)\n", instructions, address, value, (address&0x03ff)%40, (address&0x03ff)/40);
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screen[address & 0x03ff] = value;
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} else {
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printf("%08x: WRITE %04x <- %02x; READONLY\n", instructions, address, value);
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}
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}
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int main() {
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ram = (uint8_t*) malloc(0x4000);
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screen = (uint8_t*) malloc(0x400);
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memset(screen, 'X', 0x400);
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int afd = open("memtest-9000.901465.bin", O_RDONLY);
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a000 = mmap(0, 0x1000, PROT_READ, MAP_PRIVATE, afd, 0);
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int bfd = open("memtest-9000.901465.bin", O_RDONLY);
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b000 = mmap(0, 0x1000, PROT_READ, MAP_PRIVATE, bfd, 0);
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int cfd = open("basic-2-c000.901465-01.bin", O_RDONLY);
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c000 = mmap(0, 0x1000, PROT_READ, MAP_PRIVATE, cfd, 0);
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int dfd = open("basic-2-d000.901465-02.bin", O_RDONLY);
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d000 = mmap(0, 0x1000, PROT_READ, MAP_PRIVATE, dfd, 0);
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int efd = open("edit-2-n.901447-24.bin", O_RDONLY);
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e000 = mmap(0, 0x0800, PROT_READ, MAP_PRIVATE, efd, 0);
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//int ffd = open("kernal-2.901465-03.bin", O_RDONLY);
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int ffd = open("memtest-f000.901465+ascii.bin", O_RDONLY);
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f000 = mmap(0, 0x1000, PROT_READ, MAP_PRIVATE, ffd, 0);
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reset6502();
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while (1) {
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usleep(1);
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step6502();
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printf("pass: %02x, address: %02x%02x\n", ram[4], ram[1], ram[2]);
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printf("┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓\n");
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for (uint8_t row = 0; row < 25; ++row) {
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printf("┃%.40s┃\n", screen + 40*row);
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}
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printf("┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛\n");
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}
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}
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