Hardware differences between games
ROM differences between game versions
Listing of Robotron enemies by wave
Multigame conversion article (incomplete)
Pic of Multi-Game ROM address decode circuit
Pic of my Multi-Game selector circuit
Pic of my Sinistar Speech board EPROM hack
Pic of my Sinistar SRAM hack (9/30/95)
Pic of my Sinistar Blitter hack
Pic of my Defender hack circuit(3/19/95)
Defender patches for Multi-Game
Special Chip hack to switch SC1/SC2 (9/30/95)
Note: this hack can be used to run Splat with SC1s, without having to patch the ROM image.
Here's a better approach using a GAL
I added two 4-bit latches and an OR gate for address decoding to my Multi-Game machine, producing an 8-bit parallel port. I wrote 6809 code to dump RAM using a simple handshaking protocol to my Amiga at over 5K/sec. I've used it to grab pictures that are hard to get from the ROM images (such as the complete image of the Sinistar). I've also posted RAM dumps to help people disassemble code by showing what's in RAM. I also use the parallel port to select the ROM image to run. See the code and disassembler file here.
This used to be a great repository of arcade game info, but I think they got rid of it all.
Please check out Mike's Arcade instead. LOTS of great info.
DEAD WIRETAP LINKS BELOW
Stargate/Robotron/Joust multi-game
Adding Bubbles to the S/R/J multi-game
Info about Williams game hardware
Repair tips for Williams games
Converting Joust to a JAMMA connector
Using a normal joystick with Sinistar
Frederic Vecoven's speech board PCB in PostScript
e-glide's Defender/Joust/Robotron article
Williams Home Page - They're just slot machines now
rec.games.video.arcade.collecting newsgroup
