DIY Roland JV-1080 expansion card
Recently I restored a Roland XP-60 synth for a friend. It’s a digital sample based synth with possibility of expanding sample set with up to 4 expansion cards. And, while looking at service manual I got carried away a little… Those expansion cards have a pretty straightforward interface - 8 bit data bus, 20 bit address bus, a few chip enable pins. Looked like something very DIYable.
Result of the whole adventure is now on GitHub: https://github.com/tadas-s/roland-expansion-clone