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(MESS) i8530h31 now *almost* boots or at least make some beeps, instead of halting because of unmapped I/O accesses, or halting because of a bad checksum because the ROM was loaded improperly. [alegend45]

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This commit is contained in:
Scott Stone 2014-01-27 20:28:27 +00:00
parent 811fba1021
commit de6bf3dbbf
3 changed files with 36 additions and 5 deletions
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24
src/mess/drivers/at.c
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@ -23,6 +23,15 @@ static ADDRESS_MAP_START( at16_map, AS_PROGRAM, 16, at_state )
AM_RANGE(0xff0000, 0xffffff) AM_ROM AM_REGION("maincpu", 0x0f0000)
ADDRESS_MAP_END
static ADDRESS_MAP_START( ps2m30286_map, AS_PROGRAM, 16, at_state)
AM_RANGE(0x000000, 0x09ffff) AM_RAMBANK("bank10")
AM_RANGE(0x0c0000, 0x0c7fff) AM_ROM
AM_RANGE(0x0c8000, 0x0cffff) AM_ROM
AM_RANGE(0x0d0000, 0x0dffff) AM_RAM
AM_RANGE(0x0e0000, 0x0fffff) AM_ROM
AM_RANGE(0xfe0000, 0xffffff) AM_ROM AM_REGION("maincpu", 0x0e0000)
ADDRESS_MAP_END
static ADDRESS_MAP_START( ps1_286_map, AS_PROGRAM, 16, at_state )
AM_RANGE(0x000000, 0x09ffff) AM_RAMBANK("bank10")
AM_RANGE(0x0a0000, 0x0bffff) AM_DEVREADWRITE8("vga", vga_device, mem_r, mem_w, 0xffff)
@ -121,7 +130,9 @@ WRITE16_MEMBER( at_state::ps1_unk_w )
READ8_MEMBER( at_state::ps1_kbdc_r )
{
UINT8 ret = at_keybc_r(space, offset, mem_mask);
UINT8 ret;
if(offset == 0) ret = at_keybc_r(space, offset, mem_mask);
else ret = ps2_portb_r(space,offset, mem_mask);
return ret;
}
@ -440,19 +451,21 @@ MACHINE_CONFIG_END
static MACHINE_CONFIG_START( ps2m30286, at_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu", I80286, 12000000)
MCFG_CPU_PROGRAM_MAP(at16_map)
MCFG_CPU_IO_MAP(at16_io)
MCFG_CPU_ADD("maincpu", I80286, 10000000)
MCFG_CPU_PROGRAM_MAP(ps2m30286_map)
MCFG_CPU_IO_MAP(ps1_286_io)
MCFG_80286_A20(at_state, at_286_a20)
MCFG_80286_SHUTDOWN(WRITELINE(at_state, at_shutdown))
MCFG_QUANTUM_TIME(attotime::from_hz(60))
MCFG_FRAGMENT_ADD( pcvideo_vga )
MCFG_FRAGMENT_ADD( at_motherboard )
MCFG_ISA16_BUS_ADD("isabus", ":maincpu", isabus_intf)
MCFG_ISA16_SLOT_ADD("isabus","isa1", pc_isa16_cards, "fdc", false)
MCFG_ISA16_SLOT_ADD("isabus","isa2", pc_isa16_cards, "ide", false)
MCFG_ISA16_SLOT_ADD("isabus","isa3", pc_isa16_cards, "comat", false)
MCFG_ISA16_SLOT_ADD("isabus","isa4", pc_isa16_cards, "svga_et4k", false)
MCFG_PC_KBDC_SLOT_ADD("pc_kbdc", "kbd", pc_at_keyboards, STR_KBD_IBM_PC_AT_84)
/* internal ram */
@ -816,6 +829,7 @@ ROM_END
ROM_START( i8530h31 )
ROM_REGION(0x1000000,"maincpu", 0)
ROM_LOAD( "33f5381a.bin", 0xe0000, 0x20000, CRC(ff57057d) SHA1(d7f1777077a8df43c3c14d175b9709bd3969c4b1))
ROM_RELOAD(0xfe0000,0x20000)
ROM_END
/*

1
src/mess/includes/at.h
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@ -92,6 +92,7 @@ public:
DECLARE_WRITE8_MEMBER(at_page8_w);
DECLARE_READ8_MEMBER(at_portb_r);
DECLARE_WRITE8_MEMBER(at_portb_w);
DECLARE_READ8_MEMBER(ps2_portb_r);
DECLARE_READ8_MEMBER(get_slave_ack);
DECLARE_WRITE_LINE_MEMBER(at_pit8254_out0_changed);
DECLARE_WRITE_LINE_MEMBER(at_pit8254_out2_changed);

16
src/mess/machine/at.c
View File

@ -288,6 +288,22 @@ WRITE8_MEMBER( at_state::at_portb_w )
m_isabus->set_nmi_state((m_nmi_enabled==0) && (m_channel_check==0));
}
READ8_MEMBER( at_state::ps2_portb_r )
{
UINT8 data = m_at_speaker;
data &= ~0xd0; /* AT BIOS don't likes this being set */
/* 0x10 is the dram refresh line bit, 15.085us. */
data |= (machine().time().as_ticks(66291) & 1) ? 0x10 : 0;
if (m_pit8254->get_output(2))
data |= 0x20;
else
data &= ~0x20; /* ps2m30 wants this */
return data;
}
/**********************************************************
*