Just picked up a Supercharger via ebay and mod'ed it. I've tried 135
different games so far and found 3 with problems:
Air-Sea Battle - shots either don't register or a shot on lower row
blows up ship on topmost row
Canyon Bomber - screen rolls like crazy
Code Breaker - screen rolls, but differently than Canyon Bomber.
I've done some research and found a possible solution for Air-Sea Battle
here on the biglist -
http://www.biglist.com/lists/stella/archives/200008/msg00038.html
It turns out that Air-Sea battle reads the images of the collision
registers at $00/$01, as opposed to $30/$31. It looks like the SC
interferes with the mapping of the read-registers, maybe because
they overlap the write-registers there?
At any rate, patching the code to use the images at $3x makes it
work on the supercharger.
Specifically for Air-Sea Battle,
offset $00b9: $00->$30
offset $00bd: $01->$31
offset $004a: $00->$30
I tried this, but no luck. Running Air-Sea battle thru Distella it
looks like the 004a should have been 024a, but changing that didn't help
either.
The Air-Sea Battle search also turned up a few other games with the same
problem: Haunted House, Space War and Ghost Manor.
I've not found any reference to the scrolling screen problem, though I
have seen references to Canyon Bomber running OK on the Supercharger.
Any ideas? I'm using a Commodore 1084S with an SVHS VCR as the tuner
and am getting a great picture(though I do plan to build the audio/video
mods later). I always used the monitor with my Amiga at PAL
resolutions, and some of the games I tested included PAL games -
adjusting the monitor allowed me to see the whole screen.
--
Darrell Spice Jr. --==> http://www.spiceware.org <==--
* Emulators for OS/2! Stella = Atari 2600 ColEm = ColecoVision
MasterGear = Sega Master System, Game Gear, SG1000, SC3000
VGB = Game Boy, Game Boy Color, Super Game Boy
* OS/2 programming info also available.
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