Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-14 18:08:13 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

Implemented PAL-like prom read-back in 4 En Raya [Angelo Salese]

Browse Source
This commit is contained in:
Angelo Salese 2011-04-11 02:34:11 +00:00
parent 87a69b25ae
commit b46b65c679
2 changed files with 82 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

89
src/mame/drivers/4enraya.c
View File

@ -2,6 +2,10 @@
Driver by Tomasz Slanina dox@space.pl
TODO:
- video and irq timings;
- there's a waitstate penalty on the VRAM apparently?
***************************************************************************
RAM :
@ -53,6 +57,8 @@ Sound :
#include "sound/ay8910.h"
#include "includes/4enraya.h"
#define MAIN_CLOCK XTAL_8MHz
static WRITE8_HANDLER( sound_data_w )
{
_4enraya_state *state = space->machine().driver_data<_4enraya_state>();
@ -69,12 +75,77 @@ static WRITE8_DEVICE_HANDLER( sound_control_w )
state->m_last_snd_ctrl = data;
}
static READ8_HANDLER( fenraya_custom_map_r )
{
UINT8 *prom = space->machine().region("pal_prom")->base();
UINT8 prom_routing = (prom[offset >> 12] & 0xf) ^ 0xf;
UINT8 res;
res = 0;
if(prom_routing & 1) //ROM5
{
UINT8 *rom = space->machine().region("maincpu")->base();
res |= rom[offset & 0x7fff];
}
if(prom_routing & 2) //ROM4
{
UINT8 *rom = space->machine().region("maincpu")->base();
res |= rom[(offset & 0x7fff) | 0x8000];
}
if(prom_routing & 4) //RAM
{
_4enraya_state *state = space->machine().driver_data<_4enraya_state>();
res |= state->m_workram[offset & 0xfff];
}
if(prom_routing & 8) //gfx control / RAM wait
{
_4enraya_state *state = space->machine().driver_data<_4enraya_state>();
res |= state->m_videoram[offset & 0xfff];
}
return res;
}
static WRITE8_HANDLER( fenraya_custom_map_w )
{
UINT8 *prom = space->machine().region("pal_prom")->base();
UINT8 prom_routing = (prom[offset >> 12] & 0xf) ^ 0xf;
if(prom_routing & 1) //ROM5
{
// ...
}
if(prom_routing & 2) //ROM4
{
// ...
}
if(prom_routing & 4) //RAM
{
_4enraya_state *state = space->machine().driver_data<_4enraya_state>();
state->m_workram[offset & 0xfff] = data;
}
if(prom_routing & 8) //gfx control / RAM wait
{
fenraya_videoram_w(space,offset & 0xfff,data);
}
}
static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8 )
AM_RANGE(0x0000, 0xffff) AM_READWRITE(fenraya_custom_map_r,fenraya_custom_map_w)
#if 0
AM_RANGE(0x0000, 0xbfff) AM_ROM
AM_RANGE(0xc000, 0xcfff) AM_RAM
AM_RANGE(0xd000, 0xdfff) AM_WRITE(fenraya_videoram_w) AM_BASE_SIZE_MEMBER(_4enraya_state, m_videoram, m_videoram_size)
AM_RANGE(0xe000, 0xefff) AM_WRITE(fenraya_videoram_w)
AM_RANGE(0xf000, 0xffff) AM_NOP
#endif
ADDRESS_MAP_END
static ADDRESS_MAP_START( main_portmap, AS_IO, 8 )
@ -135,13 +206,13 @@ INPUT_PORTS_END
static const gfx_layout charlayout =
{
8,8, /* 8*8 characters */
RGN_FRAC(1,3), /* 1024 characters */
3, /* 3 bits per pixel */
{ RGN_FRAC(1,3), RGN_FRAC(2,3), RGN_FRAC(0,3) }, /* the bitplanes are separated */
8,8,
RGN_FRAC(1,3),
3,
{ RGN_FRAC(1,3), RGN_FRAC(2,3), RGN_FRAC(0,3) },
{ 0, 1, 2, 3, 4, 5, 6, 7 },
{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
8*8 /* every char takes 8 consecutive bytes */
8*8
};
static GFXDECODE_START( 4enraya )
@ -176,7 +247,7 @@ static PALETTE_INIT( 4enraya )
static MACHINE_CONFIG_START( 4enraya, _4enraya_state )
/* basic machine hardware */
MCFG_CPU_ADD("maincpu",Z80,8000000/2)
MCFG_CPU_ADD("maincpu",Z80,MAIN_CLOCK/2)
MCFG_CPU_PROGRAM_MAP(main_map)
MCFG_CPU_IO_MAP(main_portmap)
MCFG_CPU_PERIODIC_INT(irq0_line_hold,4*60) // unknown timing
@ -202,7 +273,7 @@ static MACHINE_CONFIG_START( 4enraya, _4enraya_state )
/* sound hardware */
MCFG_SPEAKER_STANDARD_MONO("mono")
MCFG_SOUND_ADD("aysnd", AY8910, 8000000/4) /* guess */
MCFG_SOUND_ADD("aysnd", AY8910, MAIN_CLOCK/4) /* guess */
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30)
MACHINE_CONFIG_END
@ -222,8 +293,8 @@ ROM_START( 4enraya )
ROM_LOAD( "2.bin", 0x2000, 0x2000, CRC(2b0a3793) SHA1(2c3d224251557824bb9641dc2f98a000ab72c4a2) )
ROM_LOAD( "3.bin", 0x4000, 0x2000, CRC(f6940836) SHA1(afde21ffa0c141cf73243e50da62ecfd474aaac2) )
ROM_REGION( 0x0020, "proms", 0 )
ROM_LOAD( "1.bpr", 0x0000, 0x0020, CRC(dcbd2352) SHA1(ce72e84129ed1b455aaf648e1dfaa4333e7e7628) ) /* system control - not used */
ROM_REGION( 0x0020, "pal_prom", 0 )
ROM_LOAD( "1.bpr", 0x0000, 0x0020, CRC(dcbd2352) SHA1(ce72e84129ed1b455aaf648e1dfaa4333e7e7628) ) /* system control: used for memory mapping */
ROM_END
GAME( 1990, 4enraya, 0, 4enraya, 4enraya, 0, ROT0, "IDSA", "4 En Raya", GAME_SUPPORTS_SAVE )

4
src/mame/includes/4enraya.h
View File

@ -11,8 +11,8 @@ public:
: driver_device(machine, config) { }
/* memory pointers */
UINT8 * m_videoram;
size_t m_videoram_size;
UINT8 m_videoram[0x1000];
UINT8 m_workram[0x1000];
/* video-related */
tilemap_t *m_bg_tilemap;