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More beezer changes, mostly documentation and preparing for new sound core. no whatsnew.

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This commit is contained in:
Jonathan Gevaryahu 2011-01-16 04:53:17 +00:00
parent c495397fa8
commit 745a7974aa
2 changed files with 9 additions and 11 deletions
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5
src/mame/drivers/beezer.c
View File

@ -17,7 +17,8 @@
static ADDRESS_MAP_START( main_map, ADDRESS_SPACE_PROGRAM, 8 )
AM_RANGE(0x0000, 0xbfff) AM_RAM AM_BASE_MEMBER(beezer_state, videoram)
AM_RANGE(0xc000, 0xcfff) AM_ROMBANK("bank1")
AM_RANGE(0xd000, 0xffff) AM_ROM AM_WRITE(beezer_bankswitch_w)
AM_RANGE(0xd000, 0xdfff) AM_ROM AM_WRITE(beezer_bankswitch_w) // ROM at G1, bankswitch
AM_RANGE(0xe000, 0xffff) AM_ROM // ROMS at G3, G5
ADDRESS_MAP_END
static ADDRESS_MAP_START( sound_map, ADDRESS_SPACE_PROGRAM, 8 )
@ -98,6 +99,8 @@ static MACHINE_CONFIG_START( beezer, beezer_state )
MCFG_SOUND_ADD("dac", DAC, 0)
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
//MCFG_SOUND_ADD("custom", BEEZER, 0)
//MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
/* via */
MCFG_VIA6522_ADD("via6522_0", 0, b_via_0_interface)

15
src/mame/machine/beezer.c
View File

@ -11,7 +11,6 @@ static READ8_DEVICE_HANDLER( b_via_0_pb_r );
static WRITE8_DEVICE_HANDLER( b_via_0_pa_w );
static WRITE8_DEVICE_HANDLER( b_via_0_pb_w );
static READ_LINE_DEVICE_HANDLER( b_via_0_ca2_r );
static WRITE_LINE_DEVICE_HANDLER( b_via_0_ca2_w );
static READ8_DEVICE_HANDLER( b_via_1_pa_r );
static READ8_DEVICE_HANDLER( b_via_1_pb_r );
@ -34,20 +33,20 @@ static WRITE8_DEVICE_HANDLER( b_via_1_pb_w );
bits 7-0: input/output: pbus
port C:
CA1: N/C
CA2: input? "TDISP" (not sure what this is)
CA2: input: "TDISP" (one of the higher bits in the video line counter, a mirror of the D5 bit from beezer_line_r), done in /video/beezer.c
CB1: ASH1 to via 1
CB2: ASH2 to via 1
/IRQ: to main m6809 cpu
/RES: from main reset generator/watchdog/button
TODO: figure out what TDISP is, may need to trace pcb
TODO: find a better way to attach ca2 read to beezer_line_r
*/
const via6522_interface b_via_0_interface =
{
/*inputs : A/B */ DEVCB_HANDLER(b_via_0_pa_r), DEVCB_HANDLER(b_via_0_pb_r),
/*inputs : CA/B1,CA/B2 */ DEVCB_NULL, DEVCB_DEVICE_LINE_MEMBER("via6522_1", via6522_device, read_ca2), DEVCB_LINE(b_via_0_ca2_r), DEVCB_DEVICE_LINE_MEMBER("via6522_1", via6522_device, read_ca1),
/*outputs: A/B */ DEVCB_HANDLER(b_via_0_pa_w), DEVCB_HANDLER(b_via_0_pb_w),
/*outputs: CA/B1,CA/B2 */ DEVCB_NULL, DEVCB_NULL, DEVCB_LINE(b_via_0_ca2_w), DEVCB_DEVICE_LINE_MEMBER("via6522_1", via6522_device, write_ca1),
/*outputs: CA/B1,CA/B2 */ DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_DEVICE_LINE_MEMBER("via6522_1", via6522_device, write_ca1),
/*irq */ DEVCB_CPU_INPUT_LINE("maincpu", M6809_IRQ_LINE)
};
@ -85,12 +84,8 @@ const via6522_interface b_via_1_interface =
static READ_LINE_DEVICE_HANDLER( b_via_0_ca2_r )
{
return 0; // TODO: TDISP on schematic; what is this?
}
return 0; // TODO: TDISP on schematic, same as D5 bit of scanline count from 74LS161 counter at 7A
static WRITE_LINE_DEVICE_HANDLER( b_via_0_ca2_w )
{
// TODO: TDISP on schematic; what is this?
}
static READ8_DEVICE_HANDLER( b_via_0_pa_r )
@ -124,7 +119,7 @@ static WRITE8_DEVICE_HANDLER( b_via_0_pa_w )
pbus = input_port_read(device->machine, "DSWB");
break;
case 3:
pbus = 0xff; // Technically DSWA, however it isn't populated on the board and is pulled to 0xFF with resistor pack
pbus = input_port_read(device->machine, "DSWA"); // Technically DSWA isn't populated on the board and is pulled to 0xFF with resistor pack, but there IS a DSWA port in the driver so we may as well use it.
break;
}
}