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APC: added Auxiliary Character RAM hook-up

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This commit is contained in:
Angelo Salese 2012-11-20 22:18:42 +00:00
parent e4147f05ed
commit d0f9d5518f
1 changed files with 42 additions and 13 deletions
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55
src/mess/drivers/apc.c
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@ -96,6 +96,7 @@ public:
required_device<upd765a_device> m_fdc;
required_device<am9517a_device> m_dmac;
UINT8 *m_char_rom;
UINT8 *m_aux_pcg;
required_shared_ptr<UINT8> m_video_ram_1;
required_shared_ptr<UINT8> m_video_ram_2;
@ -118,6 +119,8 @@ public:
DECLARE_WRITE8_MEMBER(apc_irq_ack_w);
DECLARE_READ8_MEMBER(apc_rtc_r);
DECLARE_WRITE8_MEMBER(apc_rtc_w);
// DECLARE_READ8_MEMBER(aux_pcg_r);
// DECLARE_WRITE8_MEMBER(aux_pcg_w);
struct {
UINT8 status; //status
@ -163,6 +166,7 @@ protected:
void apc_state::video_start()
{
m_char_rom = memregion("gfx")->base();
m_aux_pcg = memregion("aux_pcg")->base();
}
UINT32 apc_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
@ -203,11 +207,13 @@ static UPD7220_DRAW_TEXT_LINE( hgdc_draw_text )
UINT8 color;
UINT8 tile,attr,pen;
UINT32 tile_addr;
UINT8 tile_sel;
// tile_addr = addr+(x*(state->m_video_ff[WIDTH40_REG]+1));
tile_addr = addr+(x*(1));
tile = state->m_video_ram_1[(tile_addr*2+1) & 0x1fff] & 0x00ff;
tile_sel = state->m_video_ram_1[(tile_addr*2) & 0x1fff] & 0x00ff;
attr = (state->m_video_ram_1[(tile_addr*2 & 0x1fff) | 0x2000] & 0x00ff);
u_line = attr & 0x01;
@ -232,24 +238,31 @@ static UPD7220_DRAW_TEXT_LINE( hgdc_draw_text )
if(res_x > 640 || res_y > 494) //TODO
continue;
// tile_data = secret ? 0 : (state->m_char_rom[tile*char_size+interlace_on*0x800+yi]);
/*
Addr bus: C BA98 7654 3210
| |||| |\\\ \\\\- character number bits 0-6
| |||| \--------- y' bit 0
| |||\----------- y' bit 1
| ||\------------ y' bit 2
| |\------------- y' bit 3
| \-------------- character number bit 7
\---------------- y' bit 4
Addr bus: C BA98 7654 3210
| |||| |\\\ \\\\- character number bits 0-6
| |||| \--------- y' bit 0
| |||\----------- y' bit 1
| ||\------------ y' bit 2
| |\------------- y' bit 3
| \-------------- character number bit 7
\---------------- y' bit 4
y to y' (assumed; this needs hardware tests since there could be one more 'blank' line between all char rows):
y = 0 1 2 3 ... 16 17 18
y' = 18 0 1 2 ... 15 16 17
Data bus: 76543210 = pixels, in left->01234567->right order
*/
tile_data = (state->m_char_rom[(tile & 0x7f)+((tile & 0x80)<<4)+((yi_trans & 0xf)*0x80)+((yi_trans & 0x10)<<8)]);
Data bus: 76543210 = pixels, in left->01234567->right order
*/
if(tile_sel == 0x89)// Aux character RAM select TODO: correct triggering?
{
if(yi & 0x10)
tile_data = 0;
else
tile_data = state->m_aux_pcg[(tile & 0xff)*0x20+yi*2];
}
else
tile_data = state->m_char_rom[(tile & 0x7f)+((tile & 0x80)<<4)+((yi_trans & 0xf)*0x80)+((yi_trans & 0x10)<<8)];
if(reverse) { tile_data^=0xff; }
if(u_line && yi == lr-1) { tile_data = 0xff; }
@ -459,7 +472,7 @@ static ADDRESS_MAP_START( apc_map, AS_PROGRAM, 16, apc_state )
AM_RANGE(0x00000, 0x9ffff) AM_RAM
AM_RANGE(0xa0000, 0xa0fff) AM_RAM AM_SHARE("cmos")
// AM_RANGE(0xc0000, 0xcffff) standard character ROM
AM_RANGE(0xd8000, 0xdffff) AM_RAM // AUX character RAM
AM_RANGE(0xd8000, 0xd9fff) AM_RAM AM_REGION("aux_pcg", 0) // AUX character RAM
// AM_RANGE(0xe0000, 0xeffff) Special Character RAM
AM_RANGE(0xfe000, 0xfffff) AM_ROM AM_REGION("ipl", 0)
ADDRESS_MAP_END
@ -797,11 +810,25 @@ static const gfx_layout charset_8x16 =
8
};
#if 0
static const gfx_layout charset_pcg =
{
8, 16,
RGN_FRAC(1,1),
1,
{ 0 },
{ 7, 6, 5, 4, 3, 2, 1, 0 },
{ STEP16(0,16) },
8*32
};
#endif
static GFXDECODE_START( apc )
GFXDECODE_ENTRY( "gfx", 0x0000, charset_8x16, 0, 128 )
GFXDECODE_ENTRY( "gfx", 0x0800, charset_8x16, 0, 128 )
GFXDECODE_ENTRY( "gfx", 0x1000, charset_8x16, 0, 128 )
GFXDECODE_ENTRY( "gfx", 0x1800, charset_8x16, 0, 128 )
// GFXDECODE_ENTRY( "aux_pcg", 0x0000, charset_pcg, 0, 128 )
GFXDECODE_END
@ -1049,6 +1076,8 @@ ROM_START( apc )
ROM_REGION( 0x2000, "gfx", ROMREGION_ERASE00 )
ROM_LOAD("pfcu1r.bin", 0x000000, 0x002000, CRC(683efa94) SHA1(43157984a1746b2e448f3236f571011af9a3aa73) )
ROM_REGION( 0x2000, "aux_pcg", ROMREGION_ERASE00 )
ROM_END
DRIVER_INIT_MEMBER(apc_state,apc)