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Added Driver Configuration to astrof.c to emulate common wire hack which causes black background [David Haywood]

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This commit is contained in:
Fabio Priuli 2009-12-09 15:51:53 +00:00
parent a0375128a0
commit 700da468ac
1 changed files with 43 additions and 2 deletions
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45
src/mame/drivers/astrof.c
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@ -197,12 +197,34 @@ static void astrof_get_pens( running_machine *machine, pen_t *pens )
{
astrof_state *state = (astrof_state *)machine->driver_data;
offs_t i;
UINT8 bank = (state->astrof_palette_bank ? 0x10 : 0x00);
UINT8 config = input_port_read_safe(machine, "FAKE", 0x00);
UINT8 *prom = memory_region(machine, "proms");
/* a common wire hack to the pcb causes the prom halves to be inverted */
/* this results in e.g. astrof background being black */
switch (config)
{
case 0:
/* normal PROM access */
break;
case 1:
/* invert PROM acess */
bank ^= 0x10;
break;
case 2:
/* force low */
bank = 0x00;
break;
default:
/* force high */
bank = 0x10;
break;
}
for (i = 0; i < ASTROF_NUM_PENS; i++)
{
UINT8 data = prom[(state->astrof_palette_bank ? 0x10 : 0x00) | i];
UINT8 data = prom[bank | i];
pens[i] = make_pen(machine, data);
}
}
@ -591,7 +613,20 @@ ADDRESS_MAP_END
*
*************************************/
static INPUT_PORTS_START( astrof_common )
PORT_START("FAKE") // appears in DRIVER CONFIGURATION menu
/* There are PCB wire-mods which limit / change PROM access */
PORT_CONFNAME( 0x03, 0x00, "Color PROM Wiremod" )
PORT_CONFSETTING( 0x00, "Normal (no mod)" )
PORT_CONFSETTING( 0x01, "Invert Access" )
PORT_CONFSETTING( 0x02, "Force Low" )
PORT_CONFSETTING( 0x03, "Force High" )
INPUT_PORTS_END
static INPUT_PORTS_START( astrof )
PORT_INCLUDE( astrof_common )
PORT_START("IN")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
@ -645,6 +680,8 @@ INPUT_PORTS_END
/* same as 'astrof', but inputs are ACTIVE_HIGH instead of ACTIVE_LOW */
static INPUT_PORTS_START( abattle )
PORT_INCLUDE( astrof_common )
PORT_START("IN")
PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_START1 )
PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_START2 )
@ -698,6 +735,8 @@ INPUT_PORTS_END
static INPUT_PORTS_START( spfghmk2 )
PORT_INCLUDE( astrof_common )
PORT_START("IN")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )
@ -747,6 +786,8 @@ static INPUT_PORTS_START( spfghmk2 )
INPUT_PORTS_END
static INPUT_PORTS_START( spfgmk22 )
PORT_INCLUDE( astrof_common )
PORT_START("IN")
PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_START1 )
PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START2 )