6502
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COMMON
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Restructuring in preparation for setting up timer-based IRQ I/O routine

This commit is contained in:
Russell-S-Harper 2021-03-03 03:10:21 -05:00
parent fe780a8328
commit 10bc623f09
1 changed files with 35 additions and 27 deletions
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62
emulator/main.c
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@ -36,33 +36,10 @@
uint8_t memory[65536];
uint8_t read6502(uint16_t address) {
return memory[address];
}
void write6502(uint16_t address, uint8_t value) {
memory[address] = value;
}
void hook() {
int i, j;
printf("\n%04x %u %u\n", pc, instructions, clockticks6502);
for (i = _R0; i < _R8; i += 4) {
printf("R%d: ", (i - _R0) / 4);
for (j = 0; j < 4; ++j)
printf("%02x ", memory[i + j]);
if (((i - _R0) / 4) % 4 == 3)
printf("\n");
}
for (i = _I0; i < _I8; i += 4) {
printf("I%d: ", (i - _I0) / 4);
for (j = 0; j < 4; ++j)
printf("%02x ", memory[i + j]);
if (((i - _I0) / 4) % 4 == 3)
printf("\n");
}
}
/* Functions for emulator */
uint8_t read6502(uint16_t address);
void write6502(uint16_t address, uint8_t value);
void hook();
int main() {
@ -117,9 +94,40 @@ int main() {
reset6502();
/* TODO: access irq6502(); on a timer */
do
step6502();
while (memory[pc]);
return 0;
}
uint8_t read6502(uint16_t address) {
return memory[address];
}
void write6502(uint16_t address, uint8_t value) {
memory[address] = value;
}
void hook() {
int i, j;
printf("\n%04x %u %u\n", pc, instructions, clockticks6502);
for (i = _R0; i < _R8; i += 4) {
printf("R%d: ", (i - _R0) / 4);
for (j = 0; j < 4; ++j)
printf("%02x ", memory[i + j]);
if (((i - _R0) / 4) % 4 == 3)
printf("\n");
}
for (i = _I0; i < _I8; i += 4) {
printf("I%d: ", (i - _I0) / 4);
for (j = 0; j < 4; ++j)
printf("%02x ", memory[i + j]);
if (((i - _I0) / 4) % 4 == 3)
printf("\n");
}
}