iz8dwf | Galaga (gallag bootleg) arcade repair: debugging CUPL for a replacement daughterboard. @iz8dwf | Uploaded August 2022 | Updated October 2024, 1 hour ago.
This is the first part of another Gallag arcade boardset repair. The CPU pcb was missing the syncbus daughterboard so I implemented a replacement into an ATF1502 CPLD using CUPL language. It didn't come right at the first try though.

Timeline:
00:00 - Welcome
00:38 - Board inspection
01:34 - New daughterboard design
04:02 - First revision doesn't work
04:56 - Correcting my CUPL mistakes
07:47 - Daughterboard working

Second part of this repair:
youtu.be/8aQs6MMEITA

Daughterboard github repository:
github.com/iz8dwf/gallag-daughterboard