Steven Hirsch

I'm in the same position and need separated clock and data for a Heath H-27 drive subsystem (used with their PDP-11/03 clone H-11). I do have a logic analyzer and...

I'm not intimately familiar with the low level details, but most (if not all) 8" drives from this period had "separated" outputs that should be well documented. If you have...

Hi, Keir. I can use either raw sector image or HFE. If raw images are simpler to manage I don't think limiting to this format would be fatal. I believe...

Won't scaling down the timer frequency make things too granular and reduce timing accuracy? But, I am far from knowledgeable about FF internals so just thinking out loud. In terms...

I had expected this to be a special mode of some sort and - no - it won't matter if that mode provides only separated output. Hard-sector is useful to...

Hi, Skip. Did you have any luck implementing an interrupt-driven clock? If you can define the hardware, I may be able to help with the RISCV coding. At this point,...

Ah, ok. So the idea would be to check it on each iteration of the main I/O loop, correct?

Great. Handling counter wraparound is simple, given that we're unlikely to have an I/O operation taking more than 171 seconds. Let me see what I can do.

I have the timekeeping logic nominally working, but it turns out the main loop blocks on HandleIoIn() so it's possible to lose track of counter wraparound during long idle periods....

Ran into a problem: Since the firmware does not include libc there are no date parsing functions available. Is there a way to selectively link from the full libc without...