Picked up a Bootleg?? Joust Cabinet
- Thread starter 64B1T
- Start date
HudsonArcade
Well-known member
Not without a bunch of hacking on top of the Defender ROM board.
I'm still perplexed by blitter boards randomly showing up in these Williams cabs. My Joust cab was not in a Stargate cab but did have some shared Stargate hardware and the blitter board. The cab is long gone but I kept the blitter board.
Here's a pic for posterity if it helps shed any light on your find.
Here's a pic for posterity if it helps shed any light on your find.
HudsonArcade
Well-known member
Anyone want to lend me a blitter board so I can finish documenting it and publish schematics?
Most of the design is as expected, but the hidden top side wiring with the random logic on the right side is harder to make sense of.
Most of the design is as expected, but the hidden top side wiring with the random logic on the right side is harder to make sense of.
OP
OP
Are you talking about the bit hidden by that 47uF capacitor? where the traces go under the U43 chip? I can tone those out if you'd like and tell you where they go.
HudsonArcade
Well-known member
A fair amount of the top-side routing is educated guesses at this point...
There's way too many unknowns on the right side to go back and forth over email with questions... heh.
I'm actually driving through Baltimore on Tuesday, but I don't think my wife would be down for a detour on a 10-hour drive
My mistake assuming that was a Stargate cabinet. The 550851 serial number makes it highly unusual for a Joust.
HudsonArcade
Well-known member
FWIW, I don't think this board supports shifting the blit onto odd pixels.
The 373 that captures the read data only writes d<7:0> back to d<7:0>.
To handle that function, you'd need to write d<7:4> to d<3:0> for the first cycle then write oldd<3:0>,d<7:4> for the later writes.
The 373 that captures the read data only writes d<7:0> back to d<7:0>.
To handle that function, you'd need to write d<7:4> to d<3:0> for the first cycle then write oldd<3:0>,d<7:4> for the later writes.
HudsonArcade
Well-known member
Apparently nobody else has any interest in getting this documented.
Files deleted.
Files deleted.
I think it's a pretty unique bootleg
DiamondDave
Member
Man, what a bunch of awesome reading, this lead me down a deep Williams rabbit hole, while working on a Sunday. Thanks!!
OP
OP
Tronic
Well-known member
My interest was peaked because I knew there was some kind of on-going work on the blitter chips, I don't have a full set of William's boards so I wouldn't be able to test or debug.
edit: nor one of these blitter boards.
Tronic
Well-known member
Mark!, man! fast work getting that drawn up. Credit needs to paid.
