blob: b9fd6ae7f418dfaa7edb3a6035e8fdfaa37a69eb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
#include"apple.h"
void AppleOn(){
Memory = calloc(MEMORY_SIZE, sizeof(byte));
initInstructionTable();
// Load ROM
FILE *ROM = fopen ("rom.bin", "rb");
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 ToRegularASCII(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 "accurate" behavior however.
case KBD:
return 0b10000000 | ToAppleASCII(UserInput());
case KBD_CR: case DSP:
return 0b10000000;
}
return Memory[x];
}
void setMemory(address x, byte y){
Memory[x] = y;
}
|
