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docastle.c: add note about crtc and visible area, remove obsolete comments (nw)

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This commit is contained in:
Alex W. Jackson 2014-01-10 23:01:41 +00:00
parent 5c623ec2c3
commit 15b8b419d7
1 changed files with 11 additions and 5 deletions
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16
src/mame/drivers/docastle.c
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@ -134,16 +134,15 @@ TODO:
12) Mr do moves. Kills 'A' monster. Shows winning extra Mr do.
Small changes to the CPU speed or refresh rate alter the demo timing and can cause
the above sequence (not) to work (e.g. Mr Do might not fill all monsters at once
the above sequence (not) to work (e.g. Mr Do might not kill all monsters at once
on the first round).
Note that this only works in the dorunrun2 set. The dorunrun set works slightly
differently, however it hasn't been compared with the real board so it might be
right.
- unknown ports 0 and 2
- bad communication in idsoccer
- adpcm status in idsoccer
- real values for the adpcm interface in idsoccer
- handle flipscreen on/off based on address line A7 (cX0X/cX8X)
2008-08
@ -164,7 +163,7 @@ WRITE_LINE_MEMBER(docastle_state::docastle_tint)
if (state)
{
int ma6 = m_crtc->get_ma() & 0x40;
if (ma6 & ~m_prev_ma6) // MA6 rising edge
if (ma6 && !m_prev_ma6) // MA6 rising edge
m_slave->set_input_line(0, HOLD_LINE);
m_prev_ma6 = ma6;
}
@ -558,6 +557,13 @@ GFXDECODE_END
*
*************************************/
/*
The games program the CRTC for a width of 32 characters (256 pixels).
However, the DE output from the CRTC is first ANDed with the NAND of
MA1 through MA4, and then delayed by 8 pixel clocks; this effectively
blanks the first 8 pixels and last 8 pixels of each line.
*/
static MC6845_INTERFACE( crtc_intf )
{
false, /* show border area */
@ -641,7 +647,7 @@ static MACHINE_CONFIG_START( docastle, docastle_state )
MCFG_MC6845_ADD("crtc", H46505, "screen", XTAL_9_828MHz / 16, crtc_intf)
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_RAW_PARAMS(XTAL_9_828MHz/2, 0x138, 0, 0x100, 0x108, 0, 0xc0) // from crtc
MCFG_SCREEN_RAW_PARAMS(XTAL_9_828MHz/2, 0x138, 8, 0x100-8, 0x108, 0, 0xc0) // from crtc
MCFG_SCREEN_UPDATE_DRIVER(docastle_state, screen_update_docastle)
MCFG_GFXDECODE(docastle)