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sms, fixes to bios initialisation and mapper autodetection

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This commit is contained in:
kub 2024-05-23 19:01:26 +02:00
parent 1eb630c232
commit b72095041e
2 changed files with 13 additions and 14 deletions
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11
pico/z80if.c
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@ -106,6 +106,7 @@ void z80_init(void)
void z80_reset(void)
{
int is_sms = (PicoIn.AHW & (PAHW_SMS|PAHW_SG|PAHW_SC)) == PAHW_SMS;
#ifdef _USE_DRZ80
drZ80.Z80I = 0;
drZ80.Z80IM = 0;
@ -115,22 +116,20 @@ void z80_reset(void)
// other registers not changed, undefined on cold boot
#ifdef FAST_Z80SP
// drZ80 is locked in single bank
drz80_sp_base = (PicoIn.AHW & PAHW_SMS) ? 0xc000 : 0x0000;
drz80_sp_base = (PicoIn.AHW & PAHW_8BIT) ? 0xc000 : 0x0000;
drZ80.Z80SP_BASE = z80_read_map[drz80_sp_base >> Z80_MEM_SHIFT] << 1;
#endif
drZ80.Z80SP = drZ80.Z80SP_BASE + 0xffff;
drZ80.Z80SP = drZ80.Z80SP_BASE + (is_sms ? 0xdff0 : 0xffff); // simulate BIOS
drZ80.z80_irq_callback = NULL; // use auto-clear
if (PicoIn.AHW & PAHW_SMS) {
drZ80.Z80SP = drZ80.Z80SP_BASE + 0xdff0; // simulate BIOS
if (PicoIn.AHW & PAHW_8BIT)
drZ80.z80_irq_callback = dz80_noop_irq_ack;
}
// XXX: since we use direct SP pointer, it might make sense to force it to RAM,
// but we'll rely on built-in stack protection for now
#endif
#ifdef _USE_CZ80
Cz80_Reset(&CZ80);
Cz80_Set_Reg(&CZ80, CZ80_SP, 0xffff);
if (PicoIn.AHW & PAHW_SMS)
if (is_sms)
Cz80_Set_Reg(&CZ80, CZ80_SP, 0xdff0);
#endif
}