Hi all, I made no real progress on the 3032 so far. Using the pettester.bin image (is on zimmers.net) it seems that the RAM is good (I get a screen full of g's, alternating with the all characters screen). So the kernel ROM is addressed correctly. I could exclude the CPU (I have a spare one) and the ROMs. I substituted kernel and both basic ROM's sockets too, however I have continuity on all pins, so it wasn't strictly needed. 16 to 1 decoder looks as it's working, when the CPU enters a loop, I see it's cycling on most of the ROMs. Address buffers (LS244) looks good too, but I lack a logic analyzer to really have a good picture of what's going on :( Data path must be ok, otherwise there're few chances that the pettester.bin could work. The stock kernel gives a completely black screen most of the times (it clears the video ram, then gets stuck somewhere or enters a loop displaying a few characters). Next try will be swapping the ram bank's CAS lines as this problem is starting to smell like RAM addressing error or mirror (not detected by the simple pettester.bin). I'm tempted in writing a custom ROM to make tests easier, but maybe someone else already made debug ROMs for the PETs? Any hint is welcome anyway :) Frank IZ8DWF Message was sent through the cbm-hackers mailing listReceived on 2017-02-03 13:00:02
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