dougg3's latest activity
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Ddougg3 replied to the thread LCIII EPROM?.Ah, nice catch! Looks like the Bomarc schematic has an error: I confirmed it's A22 on one of my LC IIIs as well, thanks for the...
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Ddougg3 replied to the thread LCIII EPROM?.Nicely done! On a slightly unrelated tangent, I'd bet money that unpopulated connector J11 has something to do with in-system...
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Ddougg3 replied to the thread LC III, happy boing, no video output.Haha, that’s pretty wild that we both happened to have the exact same failure on our LC IIIs. Congrats!
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Ddougg3 replied to the thread LC III, happy boing, no video output.Those tests do use A0 and A1 with the *0 and *1 commands to decide the range of addresses to mess with. It might also be smart to use...
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Ddougg3 replied to the thread LC III, happy boing, no video output.If it’s doing the chimes of death, you should be able to use the serial diagnostics mode to read out the error info and run tests. The...
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Ddougg3 replied to the thread LC III, happy boing, no video output.Yeah, both my LC IIIs work fine without a battery installed. The thing that makes me think the ROM is okay: the startup chime is...
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Ddougg3 replied to the thread LC III, happy boing, no video output.I guess one other thing to add is, if you have a known good boot disk like a hard drive or SCSI hard drive emulator of your choice, see...
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Ddougg3 replied to the thread LC III, happy boing, no video output.Not dumb at all! I’ve just spent more time than I care to admit troubleshooting multiple LC IIIs. You make a good point, a trace to the...
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Ddougg3 replied to the thread LC III, happy boing, no video output.The LC III doesn't require a VRAM SIMM.
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Ddougg3 replied to the thread LC III, happy boing, no video output.I’d normally agree with you, but I saw it with my own eyes on my LC III. Usually bad RAM results in a chime followed by the chimes of death.
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Ddougg3 replied to the thread LC III, happy boing, no video output.I have an LC III that had this exact same symptom (chime and then nothing) and it ended up being a broken trace (well, a bad via)...
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Ddougg3 replied to the thread 68 pin SIMM sockets found.The ROM socket is 64-pin, not 68-pin, so I wouldn't expect it to be compatible for those. Even if you cleverly hacked it to remove 2...
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Ddougg3 replied to the thread 68 pin SIMM sockets found.I bought some of these on eBay a while back and can confirm that if you cut them apart into single sockets, they are exactly identical...
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Ddougg3 replied to the thread LCIII EPROM?.They are. They go to A20 and A21. I haven't tried it myself, but it should work. I'm not sure if you would need to do any MMU reconfig...
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Ddougg3 replied to the thread IIsi power supply won't turn off, I'm deep in schematic land.Back to the original problem of my IIsi power supply always turning itself back on when I try to shut it off: The original PSU that I...
