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Hooked up MC6845 to Laser Base [Angelo Salese]

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This commit is contained in:
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
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
writes (adr, data), address and previous
@ -19,6 +19,7 @@
#include "emu.h"
#include "cpu/z80/z80.h"
#include "deprecat.h"
#include "video/mc6845.h"
class laserbas_state : public driver_device
{
@ -102,7 +103,6 @@ static WRITE8_HANDLER(vrambank_w)
{
laserbas_state *state = space->machine().driver_data<laserbas_state>();
if ((offset & 0xf1) == 0x10)
state->m_vrambank = data & 0x40;
}
@ -116,7 +116,9 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( laserbas_io, AS_IO, 8 )
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(0x21, 0x21) AM_READ_PORT("IN0")
AM_RANGE(0x80, 0x9f) AM_WRITE(palette_w)
@ -168,6 +170,21 @@ static MACHINE_RESET( laserbas )
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 )
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_UPDATE(laserbas)
MCFG_MC6845_ADD("crtc", H46505, 3000000/4, mc6845_intf) /* unknown clock, hand tuned to get ~60 fps */
MCFG_PALETTE_LENGTH(32)
MCFG_VIDEO_START(laserbas)
MACHINE_CONFIG_END