RaySollium99/picodrive
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some irq hacks

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notes to self (derived from Nemesis):

H32: 0x10A .. 0x127 0x1D2 .. 0x1FF 0x000 0x001
pclk       30             46          1 |0x109
mclk                 770                | 2650   = 3420
68kclk              110                   378.5 ~= 488.5

H40: 0x14A .. 0x16C 0x1C9 .. 0x1FF 0x000 0x001
pclk       35             55          1
mclk     35*8       4*8+314+10+19*8     |0x149*8
                  788                   | 2632   = 3420
68kclk           112.5                    376   ~= 488.5
This commit is contained in:
notaz 2017-10-07 00:08:05 +03:00
parent e015ad3c1b
commit 22814963cc
5 changed files with 39 additions and 38 deletions
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36
pico/sek.c
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@ -25,15 +25,29 @@ M68K_CONTEXT PicoCpuFM68k;
#endif
static int do_ack(int level)
{
struct PicoVideo *pv = &Pico.video;
elprintf(EL_INTS, "%cack: @ %06x [%u], p=%02x",
level == 6 ? 'v' : 'h', SekPc, SekCyclesDone(), pv->pending_ints);
// the VDP doesn't look at the 68k level
if (pv->pending_ints & pv->reg[1] & 0x20) {
pv->pending_ints &= ~0x20;
return (pv->reg[0] & pv->pending_ints & 0x10) >> 2;
}
else if (pv->pending_ints & pv->reg[0] & 0x10)
pv->pending_ints &= ~0x10;
return 0;
}
/* callbacks */
#ifdef EMU_C68K
// interrupt acknowledgment
static int SekIntAck(int level)
{
// try to emulate VDP's reaction to 68000 int ack
if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }
else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }
PicoCpuCM68k.irq = 0;
PicoCpuCM68k.irq = do_ack(level);
return CYCLONE_INT_ACK_AUTOVECTOR;
}
@ -71,9 +85,7 @@ static int SekUnrecognizedOpcode()
#ifdef EMU_M68K
static int SekIntAckM68K(int level)
{
if (level == 4) { Pico.video.pending_ints = 0; elprintf(EL_INTS, "hack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }
else if(level == 6) { Pico.video.pending_ints &= ~0x20; elprintf(EL_INTS, "vack: @ %06x [%u]", SekPc, Pico.t.m68c_cnt); }
CPU_INT_LEVEL = 0;
CPU_INT_LEVEL = do_ack(level) << 8;
return M68K_INT_ACK_AUTOVECTOR;
}
@ -87,15 +99,7 @@ static int SekTasCallback(void)
#ifdef EMU_F68K
static void SekIntAckF68K(unsigned level)
{
if (level == 4) {
Pico.video.pending_ints = 0;
elprintf(EL_INTS, "hack: @ %06x [%u]", SekPc, SekCyclesDone());
}
else if(level == 6) {
Pico.video.pending_ints &= ~0x20;
elprintf(EL_INTS, "vack: @ %06x [%u]", SekPc, SekCyclesDone());
}
PicoCpuFM68k.interrupts[0] = 0;
PicoCpuFM68k.interrupts[0] = do_ack(level);
}
#endif