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==Roland RBUS==
Here I will refer to the excellent site of Chris Xiong who made a converter from RBUS>ADAT (but not bi-directional) He covers the technical aspect of the RBUS signal and pinouts etc here in detail -
https://chrisoft.org/blog/post/2024-02-02.html (RBUS technical information)
==To Do -==
1 - Test device first real power on.
2 - Logic Capture 50 pin header signals.
3 - Use UART Monitor program to run diagnostic commands.
4 - Investigate nature of Alesis chip.
5 - Update this wiki with final findings.
After some months working on this, and seeing the LEDs blink again (it took an embarrassingly long time to realise they were pulled high) I was satisfied I could take a short break from it. I will complete the repair by fully testing it and running the UART Monitor program.
Adeeper look at the Alesis chip: It is possible that it is a pre-programmed CPLD, but that it has JTAG access. More likely it's an OTP CPLD or GAL, PAL. Still though, it would be interesting to reveal something about it. As I said it's not on the JTAG chain here anyway.
I will update this when the device is fully tested. For now, be assured that it's back together, repaired, and starting to boot. There could be some small issues, which can be discovered and fixed with the UART function. I could only continue the marathon with a reboot myself.
Thanks for reading. I hope it's interesting and or useful! If you want the Cutter project file I can send it you, email me through the site. Or any questions I'd be happy to answer.
==NOTES -==