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Hi Bob,
Great stuff, thanks for sharing the ASM code.
Already contains a lot of useful comments.
I'll need to spend more time analysing that code;
I will maybe add more comments and upload my thoughts later.
Sure at that time uCtrl were written in ASM, but that's simply difficult to reuse on different platforms.
I may even consider to do a direct transcription into C.
KORG seem to have used a lot of 8049. To be able to upgrade without wire harness I've also already made adapter board layouts to go from 8049 to 8051 type footprint in DIL40. There are plenty of modern variants of 8051, and that's sort of a uCtrl I am familiar with. And c-compilers are also available. I can share that layout if someone is interested. By making the two serial ports pins available on an extra connector it can be easily extended with MIDI I-O.
Haitar