+/*
+ * 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)
case 0x40: /* V counter */
d = Pico.video.v_counter;
+ elprintf(EL_HVCNT, "V counter read: %02x", d);
break;
case 0x41: /* H counter */
d = Pico.m.rotate++;
+ elprintf(EL_HVCNT, "H counter read: %02x", d);
break;
case 0x80:
}
}
+static int bank_mask;
+
static void write_bank(unsigned short a, unsigned char d)
{
- d &= 0x3f; // XXX
+ elprintf(EL_Z80BNK, "bank %04x %02x @ %04x", a, d, z80_pc());
switch (a & 0x0f)
{
case 0x0c:
+ elprintf(EL_STATUS|EL_ANOMALY, "%02x written to control reg!", d);
break;
case 0x0d:
if (d != 0)
elprintf(EL_STATUS|EL_ANOMALY, "bank0 changed to %d!", d);
break;
case 0x0e:
+ 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));
#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));
void PicoPowerMS(void)
{
+ int s, tmp;
+
memset(&Pico.ram,0,(unsigned int)&Pico.rom-(unsigned int)&Pico.ram);
memset(&Pico.video,0,sizeof(Pico.video));
memset(&Pico.m,0,sizeof(Pico.m));
Pico.m.pal = 0;
+ // calculate a mask for bank writes.
+ // ROM loader has aligned the size for us, so this is safe.
+ s = 0; tmp = Pico.romsize;
+ while ((tmp >>= 1) != 0)
+ s++;
+ if (Pico.romsize > (1 << s))
+ s++;
+ tmp = 1 << s;
+ bank_mask = (tmp - 1) >> 14;
+
PicoReset();
}
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 lines_vis = 192;
+ int hint; // Hint counter
int y;
PicoFrameStartMode4();
+ hint = pv->reg[0x0a];
for (y = 0; y < lines; y++)
{
pv->v_counter = Pico.m.scanline = y;
- if (y < lines_vis)
+ if (y < lines_vis && !skip)
PicoLineMode4(y);
+
+ if (y <= lines_vis)
+ {
+ if (--hint < 0)
+ {
+ hint = pv->reg[0x0a];
+ pv->pending_ints |= 2;
+ if (pv->reg[0] & 0x10) {
+ elprintf(EL_INTS, "hint");
+ z80_int();
+ }
+ }
+ }
else if (y == lines_vis + 1) {
- Pico.video.pending_ints |= 1;
- if (Pico.video.reg[1] & 0x20) {
+ pv->pending_ints |= 1;
+ if (pv->reg[1] & 0x20) {
elprintf(EL_INTS, "vint");
z80_int();
}
cycles_done += z80_run((cycles_aim - cycles_done) >> 8) << 8;
}
- PsndGetSamplesMS();
+ if (PsndOut)
+ PsndGetSamplesMS();
+}
+
+void PicoFrameDrawOnlyMS(void)
+{
+ int lines_vis = 192;
+ int y;
+
+ PicoFrameStartMode4();
+
+ for (y = 0; y < lines_vis; y++)
+ PicoLineMode4(y);
}