Applerm-II/test.c

141 lines
3.8 KiB
C
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#include <assert.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
static uint8_t mem[0x10000];
static uint8_t key = 0x80;
static char keyString[] = "10 print \"hello\"\r20 end\rlist\rrun\r";
static uint32_t keyCount = 0;
static uint8_t last = 0x00;
void prn(int c) {
uint32_t fp;
__asm__("movs %0, r12": "=r"(fp));
fprintf(stderr, "### $%02x ###\n", c);
fflush(stderr);
__asm__("movs r12, %0":: "r"(fp));
}
void cpu6502_dump(uint32_t pc, uint32_t a, uint32_t x, uint32_t y,
uint32_t sp, uint32_t sr) {
/*
uint32_t fp;
__asm__("movs %0, r12": "=r"(fp));
assert(pc < 0x10000);
assert(a < 0x100);
assert(x < 0x100);
assert(y < 0x100);
assert(sr < 0x100);
assert(0x100 <= sp && sp < 0x200);
fprintf(stderr, "*** dump *** PC=$%04x A=$%02x X=$%02x Y=$%02x SP=$%02x "
"NV-B_DIZC=%d%d-%d_%d%d%d%d\n",
pc, a, x, y, sp & 0xff, (sr >> 7) & 1, (sr >> 6) & 1, (sr >> 4) & 1,
(sr >> 3) & 1, (sr >> 2) & 1, (sr >> 1) & 1, sr & 1);
fflush(stderr);
__asm__("movs r12, %0":: "r"(fp));
*/
}
uint8_t cpu6502_load(uint16_t addr) {
uint32_t fp;
uint8_t result = 0;
__asm__("movs %0, r12": "=r"(fp));
if (0x0400 <= addr && addr <= 0x7ff) {
// Fake text VRAM.
result = mem[addr];
} else if ((0x0300 <= addr && addr <= 0x03ff) ||
(0x0900 <= addr && addr <= 0x0fff)) {
// Fake memory impl to make it run on low memory chip.
result = last;
} else if (0x1000 <= addr & addr < 0xbfff) {
// Bus error due to minimum memory installation.
return 0xff;
fprintf(stdout, "\e[1;1Hinvalid load $%04x\n", addr);
fflush(stdout);
abort();
} else if (0xc000 <= addr & addr < 0xcfff) {
// I/O emulation.
if (0xc000 == addr) {
keyCount++;
if (keyCount < 0x800) {
result = key;
} else if (keyCount & 0xff) {
result = key;
} else {
uint32_t n = (keyCount - 0x800) >> 8;
if (n < sizeof(keyString))
key = keyString[n] | 0x80;
result = key;
}
} else if (0xc010 == addr) {
key &= 0x7f;
result = 0;
}
} else {
// Installed memory.
result = mem[addr];
}
fprintf(stderr, "load $%04x => $%02x\n", addr, result);
fflush(stderr);
__asm__("movs r12, %0":: "r"(fp));
return result;
}
void cpu6502_store(uint16_t addr, uint8_t data) {
uint32_t fp;
__asm__("movs %0, r12": "=r"(fp));
if (0x0400 <= addr && addr <= 0x7ff) {
// Fake text VRAM.
char ascii[0x40] =
"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?";
mem[addr] = data;
int y = (addr - 0x400) >> 7;
int x = addr & 0x7f;
if (x >= 0x50) {
x -= 0x50;
y += 0x10;
} else if (x >= 0x28) {
x -= 0x28;
y += 0x08;
}
if (y < 24) {
fprintf(stdout, "\e[%d;%dH%c", y + 7, x + 1, ascii[data & 0x3f]);
fflush(stdout);
}
} else if ((0x0300 <= addr && addr <= 0x03ff) ||
(0x0900 <= addr && addr <= 0x0fff)) {
// Fake memory impl to make it run on low memory chip.
last = data;
} else if (0x1000 <= addr & addr < 0xbfff) {
// Bus error due to minimum memory installation.
return;
fprintf(stdout, "\e[1;1Hinvalid store $%04x\n", addr);
fflush(stdout);
abort();
} else if (0xc000 <= addr & addr < 0xcfff) {
// I/O emulation.
if (0xc000 == addr)
key = data;
} else {
// Installed memory.
mem[addr] = data;
}
fprintf(stderr, "store $%04x <= $%02x\n", addr, data);
fflush(stderr);
__asm__("movs r12, %0":: "r"(fp));
}
int main(int argc, char** argv) {
FILE* fp = fopen("applebasic.rom", "rb");
//FILE* fp = fopen("apple2o.rom", "rb");
memset(mem, 0, 0x10000);
fread(&mem[0xd000], 1, 0x3000, fp);
fclose(fp);
cpu6502_reset();
fprintf(stderr, "quit: $%04x\n", cpu6502_run());
return 0;
}