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4enlinea: Hooked a status handler for the HCGA controller.

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(for now, simulating the state). Improved the memory map
fixing the RAM amount and offset, and added the correct
offset for the HCGA status. Also hooked 2 debug handlers
on ports e000-e001 that spit some random graphics after
30 seconds of the game execution (clue to figure out).
[Roberto Fresca]
This commit is contained in:
Roberto Fresca 2014-03-28 19:29:11 +00:00
parent 802eeaa6ab
commit 4810e86754
1 changed files with 60 additions and 16 deletions
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76
src/mame/drivers/4enlinea.c
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@ -80,10 +80,13 @@
**************************************************************************
Custom IC's...
(soon...)
TODO:
- Proper UM487F device emulation.
- Interlaced video mode.
- Sound.
- More work...
*************************************************************************/
#define MAIN_CLOCK XTAL_16MHz
@ -119,6 +122,10 @@ public:
DECLARE_WRITE8_MEMBER(crtc_config_w);
DECLARE_WRITE8_MEMBER(crtc_mode_ctrl_w);
DECLARE_WRITE8_MEMBER(crtc_colormode_w);
DECLARE_READ8_MEMBER(crtc_status_r);
DECLARE_READ8_MEMBER(unk_e000_r);
DECLARE_READ8_MEMBER(unk_e001_r);
virtual void machine_start();
virtual void machine_reset();
virtual void video_start();
@ -138,27 +145,27 @@ public:
void _4enlinea_state::video_start()
{
m_gfxdecode->gfx(0)->set_source(m_videoram);
}
UINT32 _4enlinea_state::screen_update_4enlinea(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
/* note: chars are 16*12 pixels */
int offset = 0;
for (int y = 0; y < 200; y++)
{
UINT16* dstptr_bitmap = &bitmap.pix16(y);
for (int x = 0; x < 320; x+=4)
for (int x = 0; x < 320; x += 4)
{
UINT8 pix = m_videoram[offset++];
dstptr_bitmap[x+3] = (pix>>0)&0x3;
dstptr_bitmap[x+2] = (pix>>2)&0x3;
dstptr_bitmap[x+1] = (pix>>4)&0x3;
dstptr_bitmap[x+0] = (pix>>6)&0x3;
dstptr_bitmap[x + 3] = (pix >> 0) & 0x3;
dstptr_bitmap[x + 2] = (pix >> 2) & 0x3;
dstptr_bitmap[x + 1] = (pix >> 4) & 0x3;
dstptr_bitmap[x + 0] = (pix >> 6) & 0x3;
}
}
@ -195,6 +202,43 @@ WRITE8_MEMBER(_4enlinea_state::crtc_colormode_w)
logerror("CRTC color mode (3D9h): %02x\n", data);
}
READ8_MEMBER(_4enlinea_state::crtc_status_r)
{
/*----- bits -----
7 6 5 4 3 2 1 0 For CGA Mode.
x x x x - - - - (bits 4-5-6-7 are unused)
| | | |
| | | '-- 0: Display active period.
| | | 1: Non-display period.
| | |
| | '---- 0: Light pen reset.
| | 1: Light pen set.
| |
| '------ 0: Light pen switch off.
| 1: Light pen switch on.
|
'-------- 0: Non-vertical sync period.
1: Vertical sync period.
*/
logerror("CRTC status read\n");
return (machine().rand() & 0x80); /* bit 7 ??? (is suppossed to be unused inCGA mode) */
}
READ8_MEMBER(_4enlinea_state::unk_e000_r)
{
logerror("read e000\n");
// return (machine().rand() & 0xff);
return 0xff;
}
READ8_MEMBER(_4enlinea_state::unk_e001_r)
{
logerror("read e001\n");
// return (machine().rand() & 0xff); // after 30 seconds, random strings and gfx appear on the screen.
return (machine().rand() & 0x0f); // after 30 seconds, random gfx appear on the screen.
}
/***********************************
* Memory Map Information *
@ -202,12 +246,11 @@ WRITE8_MEMBER(_4enlinea_state::crtc_colormode_w)
static ADDRESS_MAP_START( main_map, AS_PROGRAM, 8, _4enlinea_state )
AM_RANGE(0x0000, 0x7fff) AM_ROM
AM_RANGE(0x8000, 0xbfff) AM_RAM_WRITE(vram_w) AM_SHARE("videoram")
AM_RANGE(0xc000, 0xcfff) AM_RAM
AM_RANGE(0xc000, 0xdfff) AM_RAM
AM_RANGE(0xd000, 0xdfff) AM_RAM
AM_RANGE(0xe000, 0xffff) AM_RAM
AM_RANGE(0xe000, 0xe000) AM_READ(unk_e000_r)
AM_RANGE(0xe001, 0xe001) AM_READ(unk_e001_r)
ADDRESS_MAP_END
@ -219,6 +262,7 @@ static ADDRESS_MAP_START( main_portmap, AS_IO, 8, _4enlinea_state )
AM_RANGE(0xd5, 0xd5) AM_DEVWRITE("crtc", mc6845_device, register_w)
AM_RANGE(0xd8, 0xd8) AM_WRITE(crtc_mode_ctrl_w)
AM_RANGE(0xd9, 0xd9) AM_WRITE(crtc_colormode_w)
AM_RANGE(0xda, 0xda) AM_READ(crtc_status_r)
AM_RANGE(0xbf, 0xbf) AM_WRITE(crtc_config_w)
ADDRESS_MAP_END
@ -227,7 +271,7 @@ ADDRESS_MAP_END
static ADDRESS_MAP_START( audio_map, AS_PROGRAM, 8, _4enlinea_state )
AM_RANGE(0x0000, 0x7fff) AM_ROM
AM_RANGE(0xf000, 0xffff) AM_RAM
AM_RANGE(0xe000, 0xffff) AM_RAM
ADDRESS_MAP_END