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Preliminary PCjr emulation.

Browse source 
Improvements to PIT and serial emulation.
This commit is contained in:
TomW 2014-01-12 11:37:09 +00:00
commit f18f10574a
27 changed files with 1659 additions and 377 deletions
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35
src/808x.c
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@ -804,14 +804,16 @@ void clockhardware()
int diff = cycdiff - cycles - current_diff;
current_diff += diff;
pit.c[0] -= diff;
pit.c[1] -= diff;
if (pit.gate[2]) pit.c[2] -= diff;
if (pit.running[0]) pit.c[0] -= diff;
if (pit.running[1]) pit.c[1] -= diff;
if (pit.running[2]) pit.c[2] -= diff;
if ((pit.c[0] < 1) || (pit.c[1] < 1) || (pit.c[2] < 1)) pit_poll();
timer_clock(diff);
}
static int takeint = 0;
int firstrepcycle=1;
@ -826,6 +828,7 @@ void rep(int fv)
uint32_t oldds;
startrep:
temp=FETCH();
// if (firstrepcycle && temp==0xA5) printf("REP MOVSW %06X:%04X %06X:%04X\n",ds,SI,es,DI);
// if (output) printf("REP %02X %04X\n",temp,ipc);
switch (temp)
@ -1047,6 +1050,8 @@ void rep(int fv)
}
CX=c;
if (changeds) ds=oldds;
if (IRQTEST)
takeint = 1;
// if (pc==ipc) FETCHCLEAR();
}
@ -1056,7 +1061,6 @@ uint16_t lastpc,lastcs;
int firstrepcycle;
int skipnextprint=0;
int instime=0;
//#if 0
void execx86(int cycs)
@ -1102,7 +1106,7 @@ void execx86(int cycs)
{
// if ((opcode!=0xF2 && opcode!=0xF3) || firstrepcycle)
// {
if (!skipnextprint) printf("%04X:%04X : %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %02X %04X %02X %02X %02X %02X\n",cs,pc,AX,BX,CX,DX,CS,DS,ES,SS,DI,SI,BP,SP,opcode,flags, ram[0x413], ram[0x414], ram[0x415], ram[0x416]);
if (!skipnextprint) printf("%04X:%04X : %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %04X %02X %04X %i %p %02X\n",cs,pc,AX,BX,CX,DX,CS,DS,ES,SS,DI,SI,BP,SP,opcode,flags, ins, ram, ram[0x1a925]);
skipnextprint=0;
// ins++;
// }
@ -2373,7 +2377,7 @@ void execx86(int cycs)
lastpc=pc;
lastcs=CS;
temp=FETCH();
if (ssegs) ss=oldss;
writememw(ss,((SP-2)&0xFFFF),flags|0xF000);
writememw(ss,((SP-4)&0xFFFF),CS);
@ -2399,6 +2403,7 @@ void execx86(int cycs)
SP+=6;
cycles-=44;
FETCHCLEAR();
nmi_enable = 1;
break;
case 0xD0:
fetchea();
@ -3427,7 +3432,22 @@ void execx86(int cycs)
loadcs(readmemw(0,addr+2));
FETCHCLEAR();
}
else if ((flags&I_FLAG) && (pic.pend&~pic.mask) && !ssegs && !noint)
else if (nmi && nmi_enable)
{
// output = 3;
writememw(ss,(SP-2)&0xFFFF,flags|0xF000);
writememw(ss,(SP-4)&0xFFFF,CS);
writememw(ss,(SP-6)&0xFFFF,pc);
SP-=6;
addr=2<<2;
flags&=~I_FLAG;
flags&=~T_FLAG;
pc=readmemw(0,addr);
loadcs(readmemw(0,addr+2));
FETCHCLEAR();
nmi_enable = 0;
}
else if (takeint && !ssegs && !noint)
{
temp=picinterrupt();
if (temp!=0xFF)
@ -3447,6 +3467,7 @@ void execx86(int cycs)
// printf("INTERRUPT\n");
}
}
takeint = (flags&I_FLAG) && (pic.pend&~pic.mask);
if (noint) noint=0;
ins++;