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tecmosys> 6295 banking, used by tkdensho

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This commit is contained in:
davidhay 2008-06-02 23:34:32 +00:00
parent 3249ef303a
commit c9628bff32
1 changed files with 18 additions and 1 deletions
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19
src/mame/drivers/tecmosys.c
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@ -556,6 +556,23 @@ static ADDRESS_MAP_START( readport, ADDRESS_SPACE_IO, 8 )
AM_RANGE(0x60, 0x60) AM_READ(YMZ280B_status_0_r)
ADDRESS_MAP_END
// strange use of bits.. maybe it can control pin 7 too?
static WRITE8_HANDLER( tecmosys_oki_bank_w )
{
if (data==0x10)
{
OKIM6295_set_bank_base(0,0x00000);
}
else if (data==0x32)
{
OKIM6295_set_bank_base(0,0x40000);
}
else
{
popmessage("oki bank %02x\n",data);
}
}
static ADDRESS_MAP_START( writeport, ADDRESS_SPACE_IO, 8 )
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x00) AM_WRITE(YMF262_register_A_0_w)
@ -564,7 +581,7 @@ static ADDRESS_MAP_START( writeport, ADDRESS_SPACE_IO, 8 )
AM_RANGE(0x03, 0x03) AM_WRITE(YMF262_data_B_0_w)
AM_RANGE(0x10, 0x10) AM_WRITE(OKIM6295_data_0_w)
AM_RANGE(0x20, 0x20) AM_NOP
AM_RANGE(0x20, 0x20) AM_WRITE(tecmosys_oki_bank_w)
AM_RANGE(0x30, 0x30) AM_WRITE(deroon_bankswitch_w)