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igs/igs_m027_033vid.cpp: added video enable bit, removed outdated comments

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This commit is contained in:
Ivan Vangelista 2025-03-14 20:57:29 +01:00
parent 1a32ccff94
commit 1da4590aa2
1 changed files with 11 additions and 4 deletions
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15
src/mame/igs/igs_m027_033vid.cpp
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@ -91,6 +91,7 @@ private:
u32 m_xor_table[0x100];
tilemap_t *m_bg_tilemap = nullptr;
u8 m_tilebank = 0;
u8 m_video_enable = 0;
TIMER_DEVICE_CALLBACK_MEMBER(interrupt);
@ -115,6 +116,7 @@ void igs_m027_033vid_state::machine_start()
save_item(NAME(m_xor_table));
save_item(NAME(m_tilebank));
save_item(NAME(m_video_enable));
}
void igs_m027_033vid_state::video_start()
@ -124,7 +126,9 @@ void igs_m027_033vid_state::video_start()
u32 igs_m027_033vid_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
if (m_video_enable)
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
@ -140,7 +144,7 @@ TILE_GET_INFO_MEMBER(igs_m027_033vid_state::get_bg_tile_info)
int col = (attr & 0xe0) >> 5;
col <<= 1; // gfx are 4bpp, every other set of colours is unused
tileno |= (m_tilebank << 13); // bank not hooked up (where is it, when is it used, not in attract, probably D-UP game)
tileno |= (m_tilebank << 13);
tileinfo.set(0, tileno, col, 0);
}
@ -166,7 +170,10 @@ void igs_m027_033vid_state::bg_attr_videoram_w(offs_t offset, u32 data, u32 mem_
void igs_m027_033vid_state::out_port_w(u8 data)
{
LOGPORTS("%s IGS027A out port w: %02X\n", machine().describe_context(), data);
if (data & 0xea)
logerror("%s IGS027A out port w: %02X\n", machine().describe_context(), data);
m_video_enable = BIT(data, 0);
m_oki->set_rom_bank(BIT(data, 2));
@ -182,7 +189,7 @@ void igs_m027_033vid_state::out_port_w(u8 data)
***************************************************************************/
void igs_m027_033vid_state::m027_map(address_map &map) // TODO: everything to be verified
void igs_m027_033vid_state::m027_map(address_map &map) // TODO: some unknown writes
{
map(0x0800'0000, 0x0807'ffff).r(FUNC(igs_m027_033vid_state::external_rom_r)); // Game ROM