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Fix AMD98 identification (nw)

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This commit is contained in:
angelosa 2017-08-07 00:57:07 +02:00
parent faaaefbdc6
commit 76765be8e6
3 changed files with 23 additions and 3 deletions
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1
src/devices/bus/cbus/pc9801_amd98.cpp
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@ -11,7 +11,6 @@
- not sure if it's AY8910 or YM2203, from a PCB pic it looks with stock AY logos?
- Third AY (uses port B from BOTH AYs);
- PIT control;
- identification doesn't seem really working?
- PCM section;
=============================================================================

21
src/mame/drivers/pc9801.cpp
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@ -650,6 +650,24 @@ WRITE8_MEMBER( pc9801_state::sasi_ctrl_w )
// m_sasibus->write_sel(BIT(data, 0));
}
READ8_MEMBER(pc9801_state::f0_r)
{
if(offset == 0)
{
// iterate thru all devices to check if an AMD98 is present
for (pc9801_amd98_device &amd98 : device_type_iterator<pc9801_amd98_device>(machine().root_device()))
{
logerror("Read AMD98 ID %s\n",amd98.tag());
return 0x18; // return the right ID
}
logerror("Read port 0 from 0xf0 (AMD98 check?)\n");
return 0; // card not present
}
return 0xff;
}
static ADDRESS_MAP_START( pc9801_map, AS_PROGRAM, 16, pc9801_state )
AM_RANGE(0xa0000, 0xa3fff) AM_READWRITE(tvram_r,tvram_w) //TVRAM
AM_RANGE(0xa8000, 0xbffff) AM_READWRITE8(gvram_r,gvram_w,0xffff) //bitmap VRAM
@ -691,6 +709,7 @@ static ADDRESS_MAP_START( pc9801_io, AS_IO, 16, pc9801_state )
AM_RANGE(0x00a0, 0x00af) AM_READWRITE8(pc9801_a0_r,pc9801_a0_w,0xffff) //upd7220 bitmap ports / display registers
AM_RANGE(0x00c8, 0x00cb) AM_DEVICE8("upd765_2dd", upd765a_device, map, 0x00ff)
AM_RANGE(0x00cc, 0x00cd) AM_READWRITE8(fdc_2dd_ctrl_r, fdc_2dd_ctrl_w, 0x00ff) //upd765a 2dd / <undefined>
AM_RANGE(0x00f0, 0x00ff) AM_READ8(f0_r,0x00ff)
AM_IMPORT_FROM(pc9801_common_io)
ADDRESS_MAP_END
@ -776,7 +795,7 @@ READ8_MEMBER(pc9801_state::a20_ctrl_r)
else if(offset == 0x03)
return (m_gate_a20 ^ 1) | (m_nmi_ff << 1);
return 0x00;
return f0_r(space,offset);
}
WRITE8_MEMBER(pc9801_state::a20_ctrl_w)

4
src/mame/includes/pc9801.h
View File

@ -135,7 +135,7 @@ public:
required_device<gfxdecode_device> m_gfxdecode;
required_device<palette_device> m_palette;
required_device<screen_device> m_screen;
DECLARE_WRITE_LINE_MEMBER( write_uart_clock );
DECLARE_WRITE8_MEMBER(rtc_w);
DECLARE_WRITE8_MEMBER(dmapg4_w);
@ -192,6 +192,8 @@ public:
DECLARE_READ8_MEMBER(pc9801rs_knjram_r);
DECLARE_WRITE8_MEMBER(pc9801rs_knjram_w);
DECLARE_WRITE8_MEMBER(pc9801rs_bank_w);
DECLARE_READ8_MEMBER(f0_r);
DECLARE_READ8_MEMBER(a20_ctrl_r);
DECLARE_WRITE8_MEMBER(a20_ctrl_w);
DECLARE_READ8_MEMBER(fdc_mode_ctrl_r);