Short question: By chance, has anyone got a broken, non-functional HX5102 device? Any if you had, would you offer it for lab experiments? :-)
The HX5102 is the Hexbus floppy device (controller + drive). I am currently analyzing the ROMs because I want to create an emulation in MAME. I am almost done with the analysis; I think that I have a quite good idea how the system works so that an emulation is within reach.
However, there are some points that I got a bit stuck on. In particular, this concerns the CRU bits; there are some SBO/SBZ/TB that I cannot make a good sense of.
I have some high quality photographs from Jens-Eike's device from which I hoped to get some enlightenment. But the circuitry is pretty complex, and there are many traces running beneath circuits, which make it almost impossible to follow.
The other challenge is that I have no emulation for the Intel 8272A; I believe that I understood the overall operation, though. But as you see this is a real challenge: I can only rely on the software for a system that I have no schematics for, using a chip that does not have an emulation yet.
[Edit: What I find really creepy is that 5 minutes after posting this message, I searched Google for HX5102, and found this very message at second place.]
Edited by mizapf, Wed Mar 8, 2017 5:21 PM.