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odyssey2: add note

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hap 2021-02-01 21:10:21 +01:00
parent abda680cff
commit 8196ce8962
2 changed files with 8 additions and 4 deletions
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4
hash/videopac.xml
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@ -837,7 +837,7 @@ distinguished by the changed copyright from Magnavox to N.A.P. (North American P
</part>
</software>
<software name="volley">
<software name="volley" supported="partial">>
<description>Electronic Volleyball (Europe, US)</description>
<year>1979</year>
<publisher>Philips</publisher>
@ -852,7 +852,7 @@ distinguished by the changed copyright from Magnavox to N.A.P. (North American P
</part>
</software>
<software name="volleyf" cloneof="volley">
<software name="volleyf" cloneof="volley" supported="partial">>
<description>Volleyball (France)</description>
<year>1979</year>
<publisher>Radiola</publisher>

8
src/mame/drivers/odyssey2.cpp
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@ -53,7 +53,12 @@ XTAL notes (differs per model):
TODO:
- backgamm doesn't draw all the chars/sprites, it does multiple screen updates
and writes to the ptr/color registers, but does not increment the Y regs
and writes to the ptr/color registers, but does not increment the Y regs.
Does it (ab)use an undocumented 8245 feature?
- g7400 helicopt sometimes locks up at the sea level, timing or IRQ related?
- volley has a sprite-char collision detection problem, causing the team on the
right to never serve the ball. Sprite positions are correct so it's not that,
and as seen on videos of other games, transparent pixels don't cause a collision.
- screen resolution is not strictly defined, height(243) is correct, but
horizontal overscan differs depending on monitor/tv? see syracuse for overscan
- 824x on the real console, overlapping major system characters with eachother
@ -73,7 +78,6 @@ TODO:
* gtwallst turns the display on too soon, the middle scroller is partially
visible when it's not supposed to (also a bit glitchy on NTSC but not as bad)
- g7400 probably has different video timing too (not same as g7000)
- g7400 helicopt sometimes locks up at the sea level, timing related?
- 4in1 and musician are not supposed to work on g7400, but work fine on MAME,
caused by bus conflict or because they write to P2?
- according to tests, 8244 does not have a sound interrupt, but the Philips