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(nw) trs80dt1: fixed screen attributes

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- replaced nonworking hack with one that works.
This commit is contained in:
Robbbert 2019-10-05 23:36:52 +10:00
parent 404c8ff7e1
commit 19104b22ad
1 changed files with 10 additions and 18 deletions
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28
src/mame/drivers/trs80dt1.cpp
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@ -18,8 +18,6 @@ Core bugs noted:
ToDo:
- Serial i/o
- Centronics printer
- Fix video - displays every other line on top & bottom half of the screen
- Check that attributes are correctly applied
- Connect up ports 1 and 3.
- Fix timing issue with timer interrupt and remove hack
@ -94,17 +92,6 @@ void trs80dt1_state::machine_reset()
READ8_MEMBER( trs80dt1_state::dma_r )
{
m_crtc->dack_w(m_p_videoram[offset]); // write to /BS pin
// Temporary hack to work around a timing issue
// timer interrupts fires too early and ends the psuedo-dma transfer after only 77 chars
// we send the last three manually until this is fixed
if (offset%80 == 76) {
offset++;
m_crtc->dack_w(m_p_videoram[offset]);
offset++;
m_crtc->dack_w(m_p_videoram[offset]);
offset++;
m_crtc->dack_w(m_p_videoram[offset]);
}
return 0x7f;
}
@ -295,14 +282,18 @@ I8275_DRAW_CHARACTER_MEMBER( trs80dt1_state::crtc_update_row )
linecount &= 15;
const rgb_t *palette = m_palette->palette()->entry_list_raw();
u8 gfx = (lten) ? 0xff : 0;
if (!vsp)
u8 gfx = 0;
if (lten) // underline attr
gfx = 0xff;
else
if ((gpa | vsp)==0) // blinking and invisible attributes
gfx = m_p_chargen[linecount | (charcode << 4)];
if (rvv)
if (rvv) // reverse video attr
gfx ^= 0xff;
if (m_bow)
if (m_bow) // black-on-white
gfx ^= 0xff;
for(u8 i=0; i<8; i++)
@ -343,7 +334,7 @@ void trs80dt1_state::trs80dt1(machine_config &config)
X2210(config, "nvram");
TTL7474(config, m_7474, 0);
m_7474->comp_output_cb().set_inputline(m_maincpu, MCS51_INT1_LINE).invert(); // /Q connects directly to /INT1, so we need to invert?
m_7474->comp_output_cb().set_inputline(m_maincpu, MCS51_INT1_LINE).invert(); // /Q connects directly to /INT1, so we need to invert
/* sound hardware */
SPEAKER(config, "mono").front_center();
@ -355,6 +346,7 @@ ROM_START( trs80dt1 )
ROM_REGION( 0x10000, "maincpu", 0 )
ROM_LOAD( "trs80dt1.u12", 0x0000, 0x1000, CRC(04e8a53f) SHA1(7b5d5047319ef8f230b82684d97a918b564d466e) )
ROM_FILL(0x9a,1,0xd4) // fix for timer0 problem
ROM_REGION( 0x0800, "chargen", 0 )
ROM_LOAD( "8045716.u8", 0x0000, 0x0800, CRC(e2c5e59b) SHA1(0d571888d5f9fea4e565486ea8d3af8998ca46b1) )