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more sms wip, better ROM detect, line callback change

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git-svn-id: file:///home/notaz/opt/svn/PicoDrive@762 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-08-27 21:44:52 +00:00
parent 200772b790
commit 87b0845f37
19 changed files with 414 additions and 186 deletions
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60
pico/sms.c
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@ -1,3 +1,13 @@
/*
* 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 "sound/sn76496.h"
@ -71,10 +81,12 @@ static unsigned char z80_sms_in(unsigned short a)
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:
@ -125,24 +137,28 @@ static void z80_sms_out(unsigned short a, unsigned char d)
}
}
static int bank_mask;
static void write_bank(unsigned short a, unsigned char d)
{
d &= 0x3f; // XXX
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));
@ -168,11 +184,23 @@ void PicoResetMS(void)
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();
}
@ -207,9 +235,11 @@ void PicoFrameMS(void)
int cycles_line = is_pal ? 58020 : 58293; /* (226.6 : 227.7) * 256 */
int cycles_done = 0, cycles_aim = 0;
int lines_vis = 192;
int hint; // Hint counter
int y;
PicoFrameStartMode4();
hint = pv->reg[0x0a];
for (y = 0; y < lines; y++)
{
@ -217,9 +247,22 @@ void PicoFrameMS(void)
if (y < lines_vis)
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();
}
@ -232,3 +275,14 @@ void PicoFrameMS(void)
PsndGetSamplesMS();
}
void PicoFrameDrawOnlyMS(void)
{
int lines_vis = 192;
int y;
PicoFrameStartMode4();
for (y = 0; y < lines_vis; y++)
PicoLineMode4(y);
}