No idea, sorry. I couldn’t even tell you how it decides that the signal it picks up is actually the correct speed and adequate quality to be usable. The only other place it gets a clock is the 2MHz input on the CPU, which I suppose it could be comparing. In which case, if the socketry for plugging the board into the 6502 socket is ropey then the comparator signal may be too poor for success.
I do have a cheap oscilloscope but it's not fast enough to properly record a 4Meg signal. Do you know what the Solidisk board doesn't like about the pick-up points that don't work properly?
Looking back, the turning point for my board detecting the 4MHz clock may have been when I finally sorted out the flakey plug for the 6502 socket…
Yes, it's weird. The detection must be doing something reasonably clever for the "No 4Mhz clock" message to exist. Maybe I should check out the socket.
One thing, which I don't know if it means anything important, is that running "*TESTRAM" produces the error message:
"Ram test fails at bank 8, at location &2001
060K RAM tested OK".
Statistics: Posted by captainkronos — Tue Apr 22, 2025 9:14 pm