Apple-1-Tools/Ryukojiro-apple1
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Added code to load and mirror the ROM

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git-svn-id: svn+ssh://svn.phoenixbox.net/svn/apple1/trunk@4 64f78de7-aa59-e511-a0e8-0002a5492df0
This commit is contained in:
Daniel Loffgren 2015-09-14 00:09:42 +00:00
parent ac87480ce8
commit 622d6aca9c
1 changed files with 37 additions and 0 deletions
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37
apple1/main.c
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@ -8,11 +8,40 @@
#include <v6502/cpu.h> #include <v6502/cpu.h>
#include <v6502/mem.h> #include <v6502/mem.h>
#include <stdio.h>
#define ROM_START 0xF000
#define ROM_SIZE 0x00FF
void fault(void *ctx, const char *e) { void fault(void *ctx, const char *e) {
(*(int *)ctx)++; (*(int *)ctx)++;
} }
static void loadRomFile(v6502_memory *mem, const char *fname, uint16_t address) {
FILE *f = fopen(fname, "r");
if (!f) {
fprintf(stderr, "Could not read from \"%s\"!\n", fname);
return;
}
uint8_t byte;
uint16_t offset = 0;
while (fread(&byte, 1, 1, f)) {
mem->bytes[address + (offset++)] = byte;
}
printf("Loaded %u bytes at 0x%x.\n", offset, address);
fclose(f);
}
uint8_t romMirrorCallback(struct _v6502_memory *memory, uint16_t offset, int trap, void *context) {
return memory->bytes[offset % ROM_SIZE];
}
int main(int argc, const char * argv[]) int main(int argc, const char * argv[])
{ {
int faulted = 0; int faulted = 0;
@ -22,6 +51,14 @@ int main(int argc, const char * argv[])
cpu->fault_callback = fault; cpu->fault_callback = fault;
cpu->fault_context = &faulted; cpu->fault_context = &faulted;
// Load Woz Monitor
loadRomFile(cpu->memory, "apple1.rom", ROM_START);
for (uint16_t start = ROM_START + ROM_SIZE + 1;
start < v6502_memoryStartCeiling && start > ROM_START;
start += ROM_SIZE + 1) {
v6502_map(cpu->memory, start, ROM_SIZE, romMirrorCallback, NULL, NULL);
}
v6502_reset(cpu); v6502_reset(cpu);
while (!faulted) { while (!faulted) {