Apple-2-Tools/bradgrantham-apple2e
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This commit is contained in:
Brad Grantham 2016-11-06 13:55:29 -08:00
parent 2b3874879e
commit 6951e81c35
1 changed files with 88 additions and 23 deletions
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111
apple2e.cpp
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@ -180,11 +180,11 @@ struct MAINboard : board_base
{
if(addr >= text1_base && addr < text1_base + text1_size) {
printf("TEXT1 WRITE!\n");
textport_change(ram_bytes);
if(!PAGE2) textport_change(ram_bytes);
}
if(addr >= text2_base && addr < text2_base + text2_size) {
printf("TEXT2 WRITE!\n");
exit(0);
if(PAGE2) textport_change(ram_bytes);
}
if(addr >= io_base && addr < io_base + io_size) {
for(auto it = switches.begin(); it != switches.end(); it++) {
@ -364,22 +364,6 @@ struct CPU6502
unsigned char inst = read_pc_inc(bus);
switch(inst) {
case 0xCA: {
if(debug & DEBUG_DECODE) printf("DEC X\n");
x = x - 1;
flag_change(Z, x == 0x00);
flag_change(N, x & 0x80);
break;
}
case 0xC8: {
if(debug & DEBUG_DECODE) printf("INC Y\n");
y = y + 1;
flag_change(Z, y == 0x00);
flag_change(N, y & 0x80);
break;
}
case 0xEA: {
if(debug & DEBUG_DECODE) printf("NOP\n");
break;
@ -401,6 +385,14 @@ struct CPU6502
break;
}
case 0x9A: {
if(debug & DEBUG_DECODE) printf("TXS\n");
s = x;
flag_change(Z, s == 0x00);
flag_change(N, s & 0x80);
break;
}
case 0xA8: {
if(debug & DEBUG_DECODE) printf("TAY\n");
y = a;
@ -449,7 +441,7 @@ struct CPU6502
case 0xC6: {
int zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("DEC %04X\n", zpg);
if(debug & DEBUG_DECODE) printf("DEC %02X\n", zpg);
unsigned char m = bus.read(zpg) - 1;
flag_change(Z, m == 0);
flag_change(N, m & 0x80);
@ -467,6 +459,32 @@ struct CPU6502
break;
}
case 0xCA: {
if(debug & DEBUG_DECODE) printf("DEC X\n");
x = x - 1;
flag_change(Z, x == 0x00);
flag_change(N, x & 0x80);
break;
}
case 0xE6: {
int zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("INC %02X\n", zpg);
unsigned char m = bus.read(zpg) + 1;
flag_change(Z, m == 0);
flag_change(N, m & 0x80);
bus.write(zpg, m);
break;
}
case 0xC8: {
if(debug & DEBUG_DECODE) printf("INC Y\n");
y = y + 1;
flag_change(Z, y == 0x00);
flag_change(N, y & 0x80);
break;
}
case 0x10: {
int rel = (read_pc_inc(bus) + 128) % 256 - 128;
if(debug & DEBUG_DECODE) printf("BPL %02X\n", rel);
@ -502,6 +520,17 @@ struct CPU6502
break;
}
case 0xDD: {
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
if(debug & DEBUG_DECODE) printf("CMP %04X, X\n", addr);
unsigned char m = bus.read(addr + x);
flag_change(C, m <= a);
m = a - m;
flag_change(N, m & 0x80);
flag_change(Z, m == 0);
break;
}
case 0xD9: {
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
if(debug & DEBUG_DECODE) printf("CMP %04X, Y\n", addr);
@ -619,9 +648,18 @@ struct CPU6502
break;
}
case 0x25: {
unsigned char zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("AND %02X\n", zpg);
a = a & bus.read(zpg);
flag_change(Z, a == 0x00);
flag_change(N, a & 0x80);
break;
}
case 0x29: {
unsigned char imm = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("AND %02X\n", imm);
if(debug & DEBUG_DECODE) printf("AND #%02X\n", imm);
a = a & imm;
flag_change(Z, a == 0x00);
flag_change(N, a & 0x80);
@ -658,10 +696,10 @@ struct CPU6502
case 0x6C: {
int addr = read_pc_inc(bus) + read_pc_inc(bus) * 256;
if(debug & DEBUG_DECODE) printf("JMP (%04X)\n", addr);
unsigned char addrl = bus.read(addr);
unsigned char addrh = bus.read(addr + 1);
addr = addrl + addrh * 256;
if(debug & DEBUG_DECODE) printf("JMP %04X\n", addr);
pc = addr;
break;
}
@ -790,9 +828,32 @@ struct CPU6502
break;
}
case 0x51: {
unsigned char zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("EOR (%02x), Y\n", zpg);
int addr = bus.read(zpg) + bus.read(zpg + 1) * 256 + y;
unsigned char m = bus.read(addr);
a = a ^ m;
flag_change(N, a & 0x80);
flag_change(Z, a == 0);
break;
}
case 0xD1: {
unsigned char zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("CMP (%02x), Y\n", zpg);
int addr = bus.read(zpg) + bus.read(zpg + 1) * 256 + y;
unsigned char m = bus.read(addr);
flag_change(C, m <= a);
m = a - m;
flag_change(N, m & 0x80);
flag_change(Z, m == 0);
break;
}
case 0xC5: {
unsigned char zpg = read_pc_inc(bus);
if(debug & DEBUG_DECODE) printf("CMP %04X\n", zpg);
if(debug & DEBUG_DECODE) printf("CMP %02X\n", zpg);
unsigned char m = bus.read(zpg);
flag_change(C, m <= a);
m = a - m;
@ -888,6 +949,7 @@ struct CPU6502
unsigned char pcl = stack_pull(bus);
unsigned char pch = stack_pull(bus);
pc = pcl + pch * 256 + 1;
printf("%02X %02X, %04X\n", pcl, pch, pc);
break;
}
@ -940,6 +1002,9 @@ struct CPU6502
exit(1);
}
if(debug & DEBUG_STATE) {
unsigned char s0 = bus.read(0x100 + s + 0);
unsigned char s1 = bus.read(0x100 + s + 1);
unsigned char s2 = bus.read(0x100 + s + 2);
unsigned char pc0 = bus.read(pc + 0);
unsigned char pc1 = bus.read(pc + 1);
unsigned char pc2 = bus.read(pc + 2);
@ -952,7 +1017,7 @@ struct CPU6502
printf("%s", (p & I) ? "I" : "i");
printf("%s", (p & Z) ? "Z" : "z");
printf("%s ", (p & C) ? "C" : "c");
printf("S:%02X PC:%04X (%02X %02X %02X)\n", s, pc, pc0, pc1, pc2);
printf("S:%02X (%02X %02X %02X ...) PC:%04X (%02X %02X %02X ...)\n", s, s0, s1, s2, pc, pc0, pc1, pc2);
}
}
};