+/*
+ * SMS emulation
+ * (C) notaz, 2009-2010
+ *
+ * This work is licensed under the terms of MAME license.
+ * See COPYING file in the top-level directory.
+ */
/*
* TODO:
* - start in a state as if BIOS ran
- * - remaining status flags (OVR/COL)
* - RAM support in mapper
* - region support
- * - Pause button (NMI)
- * - SN76496 DAC-like usage
* - H counter
*/
#include "pico_int.h"
+#include "memory.h"
#include "sound/sn76496.h"
static unsigned char vdp_data_read(void)
struct PicoVideo *pv = &Pico.video;
unsigned char d;
- d = Pico.vramb[pv->addr];
+ d = PicoMem.vramb[pv->addr];
pv->addr = (pv->addr + 1) & 0x3fff;
pv->pending = 0;
return d;
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;
struct PicoVideo *pv = &Pico.video;
if (pv->type == 3) {
- Pico.cram[pv->addr & 0x1f] = d;
+ PicoMem.cram[pv->addr & 0x1f] = d;
Pico.m.dirtyPal = 1;
} else {
- Pico.vramb[pv->addr] = d;
+ PicoMem.vramb[pv->addr] = d;
}
pv->addr = (pv->addr + 1) & 0x3fff;
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.sms_io_ctl & 0x80) | ((Pico.sms_io_ctl << 1) & 0x40) | 0x30;
- d |= ~(PicoPad[1] >> 2) & 0x0f;
+ d = (Pico.ms.io_ctl & 0x80) | ((Pico.ms.io_ctl << 1) & 0x40) | 0x30;
+ d |= ~(PicoIn.pad[1] >> 2) & 0x0f;
break;
}
switch (a)
{
case 0x01:
- Pico.sms_io_ctl = d;
+ Pico.ms.io_ctl = d;
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:
static void write_bank(unsigned short a, unsigned char d)
{
+ elprintf(EL_Z80BNK, "bank %04x %02x @ %04x", a, d, z80_pc());
switch (a & 0x0f)
{
case 0x0c:
d &= bank_mask;
z80_map_set(z80_read_map, 0x4000, 0x7fff, Pico.rom + (d << 14), 0);
#ifdef _USE_CZ80
- Cz80_Set_Fetch(&CZ80, 0x4000, 0x7fff, (UINT32)Pico.rom + (d << 14));
+ Cz80_Set_Fetch(&CZ80, 0x4000, 0x7fff, (FPTR)Pico.rom + (d << 14));
#endif
break;
case 0x0f:
d &= bank_mask;
z80_map_set(z80_read_map, 0x8000, 0xbfff, Pico.rom + (d << 14), 0);
#ifdef _USE_CZ80
- Cz80_Set_Fetch(&CZ80, 0x8000, 0xbfff, (UINT32)Pico.rom + (d << 14));
+ Cz80_Set_Fetch(&CZ80, 0x8000, 0xbfff, (FPTR)Pico.rom + (d << 14));
#endif
break;
}
+ Pico.ms.carthw[a & 0x0f] = d;
}
-static void MEMH_FUNC xwrite(unsigned int a, unsigned char d)
+static void xwrite(unsigned int a, unsigned char d)
{
elprintf(EL_IO, "z80 write [%04x] %02x", a, d);
if (a >= 0xc000)
- Pico.zram[a & 0x1fff] = d;
- if (a >= 0xfff0)
+ PicoMem.zram[a & 0x1fff] = d;
+ if (a >= 0xfff8)
write_bank(a, d);
}
{
int s, tmp;
- memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
+ memset(&PicoMem,0,sizeof(PicoMem));
memset(&Pico.video,0,sizeof(Pico.video));
memset(&Pico.m,0,sizeof(Pico.m));
Pico.m.pal = 0;
tmp = 1 << s;
bank_mask = (tmp - 1) >> 14;
+ Pico.ms.carthw[0x0e] = 1;
+ Pico.ms.carthw[0x0f] = 2;
+
PicoReset();
}
void PicoMemSetupMS(void)
{
z80_map_set(z80_read_map, 0x0000, 0xbfff, Pico.rom, 0);
- z80_map_set(z80_read_map, 0xc000, 0xdfff, Pico.zram, 0);
- z80_map_set(z80_read_map, 0xe000, 0xffff, Pico.zram, 0);
+ z80_map_set(z80_read_map, 0xc000, 0xdfff, PicoMem.zram, 0);
+ z80_map_set(z80_read_map, 0xe000, 0xffff, PicoMem.zram, 0);
z80_map_set(z80_write_map, 0x0000, 0xbfff, xwrite, 1);
- z80_map_set(z80_write_map, 0xc000, 0xdfff, Pico.zram, 0);
+ z80_map_set(z80_write_map, 0xc000, 0xdfff, PicoMem.zram, 0);
z80_map_set(z80_write_map, 0xe000, 0xffff, xwrite, 1);
#ifdef _USE_DRZ80
drZ80.z80_out = z80_sms_out;
#endif
#ifdef _USE_CZ80
- Cz80_Set_Fetch(&CZ80, 0x0000, 0xbfff, (UINT32)Pico.rom);
- Cz80_Set_Fetch(&CZ80, 0xc000, 0xdfff, (UINT32)Pico.zram);
- Cz80_Set_Fetch(&CZ80, 0xe000, 0xffff, (UINT32)Pico.zram);
+ Cz80_Set_Fetch(&CZ80, 0x0000, 0xbfff, (FPTR)Pico.rom);
+ Cz80_Set_Fetch(&CZ80, 0xc000, 0xdfff, (FPTR)PicoMem.zram);
+ Cz80_Set_Fetch(&CZ80, 0xe000, 0xffff, (FPTR)PicoMem.zram);
Cz80_Set_INPort(&CZ80, z80_sms_in);
Cz80_Set_OUTPort(&CZ80, z80_sms_out);
#endif
}
+void PicoStateLoadedMS(void)
+{
+ write_bank(0xfffe, Pico.ms.carthw[0x0e]);
+ write_bank(0xffff, Pico.ms.carthw[0x0f]);
+}
+
void PicoFrameMS(void)
{
struct PicoVideo *pv = &Pico.video;
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 = PicoIn.skipFrame;
int lines_vis = 192;
int hint; // Hint counter
+ int nmi;
int y;
+ PsndStartFrame();
+
+ nmi = (PicoIn.pad[0] >> 7) & 1;
+ if (!Pico.ms.nmi_state && nmi)
+ z80_nmi();
+ Pico.ms.nmi_state = nmi;
+
PicoFrameStartMode4();
hint = pv->reg[0x0a];
for (y = 0; y < lines; y++)
{
pv->v_counter = Pico.m.scanline = y;
+ if (y > 218)
+ pv->v_counter = y - 6;
- if (y < lines_vis)
+ if (y < lines_vis && !skip)
PicoLineMode4(y);
if (y <= lines_vis)
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;
}
- PsndGetSamplesMS();
+ if (PicoIn.sndOut && Pico.snd.psg_line < lines)
+ PsndDoPSG(lines - 1);
}
void PicoFrameDrawOnlyMS(void)
PicoLineMode4(y);
}
+// vim:ts=2:sw=2:expandtab
notaz.gp2x.de / picodrive.git / blobdiff