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Hooked up MC6845 to Laser Base [Angelo Salese]

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Angelo Salese 2011-10-25 19:56:09 +00:00
parent dbfe5c2a23
commit f8648f7607
1 changed files with 23 additions and 4 deletions
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25
src/mame/drivers/laserbas.c
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@ -3,7 +3,7 @@
IC marked as Z1 is probably protection device IC marked as Z1 is probably protection device
mapped in memory region f800-fbff mapped in memory region f800-fbff
(simil. to the one used in Parallel Turn) (similar to the one used in Parallel Turn)
Reads form this device depends on previous Reads form this device depends on previous
writes (adr, data), address and previous writes (adr, data), address and previous
@ -19,6 +19,7 @@
#include "emu.h" #include "emu.h"
#include "cpu/z80/z80.h" #include "cpu/z80/z80.h"
#include "deprecat.h" #include "deprecat.h"
#include "video/mc6845.h"
class laserbas_state : public driver_device class laserbas_state : public driver_device
{ {
@ -102,7 +103,6 @@ static WRITE8_HANDLER(vrambank_w)
{ {
laserbas_state *state = space->machine().driver_data<laserbas_state>(); laserbas_state *state = space->machine().driver_data<laserbas_state>();
if ((offset & 0xf1) == 0x10)
state->m_vrambank = data & 0x40; state->m_vrambank = data & 0x40;
} }
@ -116,7 +116,9 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( laserbas_io, AS_IO, 8 ) static ADDRESS_MAP_START( laserbas_io, AS_IO, 8 )
ADDRESS_MAP_GLOBAL_MASK(0xff) ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x1f) AM_WRITE(vrambank_w) AM_RANGE(0x00, 0x00) AM_DEVWRITE_MODERN("crtc", mc6845_device, address_w)
AM_RANGE(0x01, 0x01) AM_DEVWRITE_MODERN("crtc", mc6845_device, register_w)
AM_RANGE(0x10, 0x10) AM_WRITE(vrambank_w)
AM_RANGE(0x20, 0x20) AM_READ(read_unk) AM_WRITENOP//write = ram/rom bank ? at fc00-f800 ? AM_RANGE(0x20, 0x20) AM_READ(read_unk) AM_WRITENOP//write = ram/rom bank ? at fc00-f800 ?
AM_RANGE(0x21, 0x21) AM_READ_PORT("IN0") AM_RANGE(0x21, 0x21) AM_READ_PORT("IN0")
AM_RANGE(0x80, 0x9f) AM_WRITE(palette_w) AM_RANGE(0x80, 0x9f) AM_WRITE(palette_w)
@ -168,6 +170,21 @@ static MACHINE_RESET( laserbas )
state->m_count = 0; state->m_count = 0;
} }
static const mc6845_interface mc6845_intf =
{
"screen", /* screen we are acting on */
8, /* number of pixels per video memory address */
NULL, /* before pixel update callback */
NULL, /* row update callback */
NULL, /* after pixel update callback */
DEVCB_NULL, /* callback for display state changes */
DEVCB_NULL, /* callback for cursor state changes */
DEVCB_NULL, /* HSYNC callback */
DEVCB_NULL, /* VSYNC callback */
NULL /* update address callback */
};
static MACHINE_CONFIG_START( laserbas, laserbas_state ) static MACHINE_CONFIG_START( laserbas, laserbas_state )
MCFG_CPU_ADD("maincpu", Z80, 4000000) MCFG_CPU_ADD("maincpu", Z80, 4000000)
@ -186,6 +203,8 @@ static MACHINE_CONFIG_START( laserbas, laserbas_state )
MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1) MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1)
MCFG_SCREEN_UPDATE(laserbas) MCFG_SCREEN_UPDATE(laserbas)
MCFG_MC6845_ADD("crtc", H46505, 3000000/4, mc6845_intf) /* unknown clock, hand tuned to get ~60 fps */
MCFG_PALETTE_LENGTH(32) MCFG_PALETTE_LENGTH(32)
MCFG_VIDEO_START(laserbas) MCFG_VIDEO_START(laserbas)
MACHINE_CONFIG_END MACHINE_CONFIG_END