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allow limited z80 vdp access

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lame and totally wrong timing
This commit is contained in:
notaz 2017-09-26 02:59:31 +03:00
parent 40d22a8e76
commit b0e08dff9a
1 changed files with 4 additions and 2 deletions
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6
pico/memory.c
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@ -1165,7 +1165,9 @@ void PicoWrite16_32x(u32 a, u32 d) {}
static unsigned char z80_md_vdp_read(unsigned short a) static unsigned char z80_md_vdp_read(unsigned short a)
{ {
// TODO? if ((a & 0x00e0) == 0x0000)
return PicoVideoRead8(a); // FIXME: depends on 68k cycles
elprintf(EL_ANOMALY, "z80 invalid r8 [%06x] %02x", a, 0xff); elprintf(EL_ANOMALY, "z80 invalid r8 [%06x] %02x", a, 0xff);
return 0xff; return 0xff;
} }
@ -1192,13 +1194,13 @@ static void z80_md_ym2612_write(unsigned int a, unsigned char data)
static void z80_md_vdp_br_write(unsigned int a, unsigned char data) static void z80_md_vdp_br_write(unsigned int a, unsigned char data)
{ {
// TODO: allow full VDP access
if ((a&0xfff9) == 0x7f11) // 7f11 7f13 7f15 7f17 if ((a&0xfff9) == 0x7f11) // 7f11 7f13 7f15 7f17
{ {
if (PicoOpt & POPT_EN_PSG) if (PicoOpt & POPT_EN_PSG)
SN76496Write(data); SN76496Write(data);
return; return;
} }
// at least VDP data writes hang my machine
if ((a>>8) == 0x60) if ((a>>8) == 0x60)
{ {