/*
* TODO:
* - start in a state as if BIOS ran
- * - remaining status flags (OVR/COL)
* - RAM support in mapper
* - region support
- * - SN76496 DAC-like usage
* - H counter
*/
#include "pico_int.h"
static unsigned char vdp_ctl_read(void)
{
- unsigned char d = Pico.video.pending_ints << 7;
- Pico.video.pending = 0;
- Pico.video.pending_ints = 0;
+ struct PicoVideo *pv = &Pico.video;
+ unsigned char d;
+
+ z80_int_assert(0);
+ d = pv->status | (pv->pending_ints << 7);
+ pv->pending = pv->pending_ints = 0;
+ pv->status = 0;
elprintf(EL_SR, "VDP sr: %02x", d);
return d;
pv->pending = 0;
}
-static void vdp_ctl_write(unsigned char d)
+static NOINLINE void vdp_reg_write(struct PicoVideo *pv, u8 a, u8 d)
+{
+ int l;
+
+ pv->reg[a] = d;
+ switch (a) {
+ case 0:
+ l = pv->pending_ints & (d >> 3) & 2;
+ elprintf(EL_INTS, "hint %d", l);
+ z80_int_assert(l);
+ break;
+ case 1:
+ l = pv->pending_ints & (d >> 5) & 1;
+ elprintf(EL_INTS, "vint %d", l);
+ z80_int_assert(l);
+ break;
+ }
+}
+
+static void vdp_ctl_write(u8 d)
{
struct PicoVideo *pv = &Pico.video;
if (pv->pending) {
if ((d >> 6) == 2) {
- pv->reg[d & 0x0f] = pv->addr;
elprintf(EL_IO, " VDP r%02x=%02x", d & 0x0f, pv->addr & 0xff);
+ if (pv->reg[d & 0x0f] != (u8)pv->addr)
+ vdp_reg_write(pv, d & 0x0f, pv->addr);
}
pv->type = d >> 6;
pv->addr &= 0x00ff;
break;
case 0xc0: /* I/O port A and B */
- d = ~((PicoPad[0] & 0x3f) | (PicoPad[1] << 6));
+ d = ~((PicoIn.pad[0] & 0x3f) | (PicoIn.pad[1] << 6));
break;
case 0xc1: /* I/O port B and miscellaneous */
d = (Pico.ms.io_ctl & 0x80) | ((Pico.ms.io_ctl << 1) & 0x40) | 0x30;
- d |= ~(PicoPad[1] >> 2) & 0x0f;
+ d |= ~(PicoIn.pad[1] >> 2) & 0x0f;
break;
}
case 0x40:
case 0x41:
- if (PicoOpt & POPT_EN_PSG)
- SN76496Write(d);
+ if ((d & 0x90) == 0x90 && Pico.snd.psg_line < Pico.m.scanline)
+ PsndDoPSG(Pico.m.scanline);
+ SN76496Write(d);
break;
case 0x80:
int lines = is_pal ? 313 : 262;
int cycles_line = is_pal ? 58020 : 58293; /* (226.6 : 227.7) * 256 */
int cycles_done = 0, cycles_aim = 0;
- int skip = PicoSkipFrame;
+ int skip = PicoIn.skipFrame;
int lines_vis = 192;
int hint; // Hint counter
int nmi;
PsndStartFrame();
- nmi = (PicoPad[0] >> 7) & 1;
+ nmi = (PicoIn.pad[0] >> 7) & 1;
if (!Pico.ms.nmi_state && nmi)
z80_nmi();
Pico.ms.nmi_state = nmi;
pv->pending_ints |= 2;
if (pv->reg[0] & 0x10) {
elprintf(EL_INTS, "hint");
- z80_int();
+ z80_int_assert(1);
}
}
}
pv->pending_ints |= 1;
if (pv->reg[1] & 0x20) {
elprintf(EL_INTS, "vint");
- z80_int();
+ z80_int_assert(1);
}
}
+ // 224 because of how it's done for MD...
+ if (y == 224 && PicoIn.sndOut)
+ PsndGetSamplesMS();
+
cycles_aim += cycles_line;
cycles_done += z80_run((cycles_aim - cycles_done) >> 8) << 8;
}
- if (PsndOut)
- PsndGetSamplesMS();
+ if (PicoIn.sndOut && Pico.snd.psg_line < lines)
+ PsndDoPSG(lines - 1);
}
void PicoFrameDrawOnlyMS(void)
PicoLineMode4(y);
}
+// vim:ts=2:sw=2:expandtab