80486DX2-66/86Box-fork
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Reimplemented the 808x IN and OUT instructions, fixes the PIT test on the IBM PC and XT BIOS'es.

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OBattler
2023-07-07 19:33:44 +02:00
parent a926c7e844
commit 32116fdd8f
1 changed files with 34 additions and 28 deletions
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62
src/cpu/808x.c
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@@ -2375,7 +2375,7 @@ execx86(int cycs)
/* alu rm, r / r, rm */
bits = 8 << (opcode & 1);
do_mod_rm();
access(46, bits);
// access(46, bits);
tempw = get_ea();
cpu_alu_op = (opcode >> 3) & 7;
if ((opcode & 2) == 0) {
@@ -2392,10 +2392,10 @@ execx86(int cycs)
wait(1, 0);
if (cpu_alu_op != 7) {
if ((opcode & 2) == 0) {
access(10, bits);
set_ea(cpu_data);
if (cpu_mod == 3)
wait(2, 0);
access(25, bits);
set_ea(cpu_data);
} else
set_reg(cpu_reg, cpu_data);
}
@@ -2695,7 +2695,6 @@ execx86(int cycs)
/* MOV reg, rm */
bits = 8 << (opcode & 1);
do_mod_rm();
access(50, bits);
set_reg(cpu_reg, get_ea());
wait(1, 0);
if (cpu_mod != 3)
@@ -2707,7 +2706,7 @@ execx86(int cycs)
wait(1, 0);
if (cpu_mod != 3)
wait(2, 0);
access(14, 16);
access(16, 16);
seteaw(_opseg[(rmdat & 0x18) >> 3]->seg);
break;
@@ -3334,37 +3333,44 @@ execx86(int cycs)
case 0xE4:
case 0xE5:
bits = 8 << (opcode & 1);
wait(1, 0);
cpu_data = pfq_fetchb();
cpu_state.eaaddr = cpu_data;
access(46, bits);
wait(1, 0);
cpu_io(bits, 0, cpu_state.eaaddr);
break;
case 0xE6:
case 0xE7:
bits = 8 << (opcode & 1);
wait(1, 0);
cpu_data = pfq_fetchb();
cpu_state.eaaddr = cpu_data;
cpu_data = (bits == 16) ? AX : AL;
access(46, bits);
wait(2, 0);
cpu_io(bits, 1, cpu_state.eaaddr);
break;
case 0xEC:
case 0xED:
bits = 8 << (opcode & 1);
cpu_data = DX;
cpu_state.eaaddr = cpu_data;
access(3, bits);
wait(1, 0);
cpu_io(bits, 0, cpu_state.eaaddr);
break;
case 0xEE:
case 0xEF:
bits = 8 << (opcode & 1);
if ((opcode & 0x0e) != 0x0c)
wait(1, 0);
if ((opcode & 8) == 0)
cpu_data = pfq_fetchb();
else
cpu_data = DX;
wait(2, 0);
cpu_data = DX;
cpu_state.eaaddr = cpu_data;
if ((opcode & 2) == 0) {
access(3, bits);
if (opcode & 1)
cpu_io(16, 0, cpu_data);
else
cpu_io(8, 0, cpu_data);
wait(1, 0);
} else {
if ((opcode & 8) == 0)
access(8, bits);
else
access(9, bits);
if (opcode & 1)
cpu_io(16, 1, cpu_data);
else
cpu_io(8, 1, cpu_data);
}
cpu_data = (bits == 16) ? AX : AL;
access(3, bits);
cpu_io(bits, 1, cpu_state.eaaddr);
wait(1, 0);
break;
case 0xE8: /*CALL rel 16*/