diff options
Diffstat (limited to 'src/mess/drivers/compis.c')
| -rw-r--r-- | src/mess/drivers/compis.c | 54 |
1 files changed, 25 insertions, 29 deletions
diff --git a/src/mess/drivers/compis.c b/src/mess/drivers/compis.c index 688304fa45a..a69b7398f80 100644 --- a/src/mess/drivers/compis.c +++ b/src/mess/drivers/compis.c @@ -100,6 +100,24 @@ READ16_MEMBER( compis_state::isbx1_tdma_r ) if (offset < 2) return m_crtc->read(space, offset & 0x01); else + // monochrome only, hblank? vblank? + if(offset == 2) + { + switch(m_unk_video) + { + case 0x04: + m_unk_video = 0x44; + break; + case 0x44: + m_unk_video = 0x64; + break; + default: + m_unk_video = 0x04; + break; + } + return m_unk_video; + } + else return 0; } else @@ -115,7 +133,9 @@ WRITE16_MEMBER( compis_state::isbx1_tdma_w ) { if (ACCESSING_BITS_0_7) { + // 0x336 is likely the color plane register if (offset < 2) m_crtc->write(space, offset & 0x01, data); + } else { @@ -221,27 +241,6 @@ WRITE16_MEMBER( compis_state::isbx1_dack_w ) } -//------------------------------------------------- -// vram_r - -//------------------------------------------------- - -READ8_MEMBER( compis_state::vram_r ) -{ - return m_video_ram[offset]; -} - - -//------------------------------------------------- -// vram_w - -//------------------------------------------------- - -WRITE8_MEMBER( compis_state::vram_w ) -{ - m_video_ram[offset] = data; -} - - - //************************************************************************** // ADDRESS MAPS //************************************************************************** @@ -253,7 +252,6 @@ WRITE8_MEMBER( compis_state::vram_w ) static ADDRESS_MAP_START( compis_mem, AS_PROGRAM, 16, compis_state ) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x00000, 0x1ffff) AM_RAM - AM_RANGE(0x40000, 0x5ffff) AM_READWRITE8(vram_r, vram_w, 0xffff) AM_RANGE(0x60000, 0x63fff) AM_MIRROR(0x1c000) AM_DEVICE(I80130_TAG, i80130_device, rom_map) AM_RANGE(0xe0000, 0xeffff) AM_MIRROR(0x10000) AM_ROM AM_REGION(I80186_TAG, 0) ADDRESS_MAP_END @@ -265,9 +263,7 @@ ADDRESS_MAP_END static ADDRESS_MAP_START( compis2_mem, AS_PROGRAM, 16, compis_state ) ADDRESS_MAP_UNMAP_HIGH - AM_RANGE(0x00000, 0x3ffff) AM_RAM - AM_RANGE(0x40000, 0x5ffff) AM_READWRITE8(vram_r, vram_w, 0xffff) - AM_RANGE(0x60000, 0xbffff) AM_RAM + AM_RANGE(0x00000, 0xbffff) AM_RAM AM_RANGE(0xe0000, 0xeffff) AM_MIRROR(0x10000) AM_ROM AM_REGION(I80186_TAG, 0) ADDRESS_MAP_END @@ -317,8 +313,8 @@ ADDRESS_MAP_END //------------------------------------------------- static ADDRESS_MAP_START( upd7220_map, AS_0, 8, compis_state ) - ADDRESS_MAP_GLOBAL_MASK(0x1ffff) - AM_RANGE(0x00000, 0x1ffff) AM_RAM AM_SHARE("video_ram") + ADDRESS_MAP_GLOBAL_MASK(0x7fff) + AM_RANGE(0x00000, 0x7fff) AM_RAM AM_SHARE("video_ram") ADDRESS_MAP_END @@ -455,11 +451,11 @@ INPUT_PORTS_END UPD7220_DISPLAY_PIXELS_MEMBER( compis_state::hgdc_display_pixels ) { - UINT8 i,gfx = m_video_ram[address]; + UINT8 i,gfx = m_video_ram[(address & 0x7fff)]; const pen_t *pen = m_palette->pens(); for(i=0; i<8; i++) - bitmap.pix32(y, x + i) = pen[BIT(gfx, i)]; + bitmap.pix32(y, x + i) = pen[BIT(gfx, 7 - i)]; } |