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#include"apple.h"
void AppleOn(){
Memory = calloc(MEMORY_SIZE, sizeof(byte));
InitInstructionTable();
// Load ROM.
FILE *ROM = fopen ("rom.bin", "rb");
if (ROM == NULL) {
printf("\n\rROM does not exist.\n");
abort();
}
for (int i = 0; i < 256; i++) {
Memory[0xFF00+i] = fgetc(ROM);
}
}
void AppleReset(){
acc = 0; X = 0; Y = 0; P = 0; S = 0;
idata.cycles = 0; idata.length = 0; idata.add = 0; idata.value = 0;
PC = 0xFF00;
free(Memory);
Memory = calloc(MEMORY_SIZE, sizeof(byte));
}
byte ToAppleAscii(char x)
{
if (x < 0x20 || x >= 0x60)
return -1;
if (x >= 0x40)
x -= 0x40;
return x;
}
byte ToAscii(char x)
{
if (x < 0x20)
x += 0x40;
return x;
}
byte GetMemory(address x){
switch(x)
{
// I opted to make the kbd return successfully at all times for the sake of simplicity.
// This is not technically "accurate" behavior however.
case KBD:
return 0b10000000 | ToAppleAscii(UserInput());
case KBD_CR: case DSP:
return 0b10000000;
default:
return Memory[x];
}
}
void SetMemory(address x, byte y){
Memory[x] = y;
}
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