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blockch: add notes

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This commit is contained in:
hap 2021-02-11 14:45:53 +01:00
parent e0b0072ef0
commit 20ba4411df
1 changed files with 13 additions and 6 deletions
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19
src/mame/drivers/blockch.cpp
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@ -10,12 +10,14 @@ Hardware notes:
- NEC 8228, 2*NEC 8255C
- 4KB ROM (4*MB8518)
- 256 bytes SRAM(2*MB8101), 1KB SRAM(2*M58754S)
- 1bpp bitmap + ball sprite
- 1bpp bitmap + ball sprite, paddle sprite
- discrete sound
- 15 switches (not the usual small dipswitches, but separate large switches)
TODO:
- paddle sprite and missing (presumed) ball vs paddle collision detection
- missing paddle position read (or maybe ball vs paddle collision detection)
- interrupts are wrong, it looks like it expects IN.2 0x40 to be low for a while before the 2nd irq
- is mirror(0x08) on the PPIs correct? it reads from 0x1c what may be paddle related too
- video timing is wrong
- identify remaining switches
- the flyer photo shows a green screen, assumed to be an overlay on a B&W CRT
@ -113,8 +115,13 @@ u32 blockch_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, co
// draw paddle
// TODO: preliminary
int py = m_inputs[3]->read();
if (cliprect.contains(py, 10))
bitmap.pix(py, 10) = rgb_t::white();
int px[2] = { 186, 46 };
for (int y = py; y < (py + 20); y++)
for (int i = 0; i < 2; i++)
for (int x = px[i]; x < (px[i] + 2); x++)
if (cliprect.contains(x, y))
bitmap.pix(y, x) = rgb_t::white();
return 0;
}
@ -224,7 +231,7 @@ static INPUT_PORTS_START( blockch )
PORT_DIPNAME( 0x10, 0x10, "Unknown 2_10" )
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x10, DEF_STR( On ) )
PORT_DIPNAME( 0x20, 0x00, "Unknown 2_20" )
PORT_DIPNAME( 0x20, 0x00, "Unknown 2_20" ) // collision related?
PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
PORT_DIPSETTING( 0x20, DEF_STR( On ) )
PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_CUSTOM ) PORT_VBLANK("screen")
@ -233,7 +240,7 @@ static INPUT_PORTS_START( blockch )
PORT_DIPSETTING( 0x80, DEF_STR( On ) )
PORT_START("IN.3")
PORT_BIT( 0xff, 0x00, IPT_PADDLE ) PORT_SENSITIVITY(50) PORT_KEYDELTA(10) PORT_CENTERDELTA(0)
PORT_BIT( 0xff, 0x00, IPT_PADDLE ) PORT_SENSITIVITY(40) PORT_KEYDELTA(10) PORT_CENTERDELTA(0)
INPUT_PORTS_END