11-05-2022, 09:36 PM
Whoah! Many answers!
Thanks again someone and Ernest. I was planning on working on this tomorrow night but I'm working on it tonight to see if I can get ahead.
Ernest, the base board is marked 1248-4-02W. I have not yet checked what (if any) mods have been done to this, other than the conversion I did to DRAM.
someone, I probed around IC11 and l can see it properly inverting on pins. I even plugged in the second probe on my scope to check. (Pin 1 High, Pin 3 Floating, Pin 5 data, Pin 8 High, Pin 10 High, Pin 12 data)
I'll start thinking about how to code up a test. I had an idea how to do the mem test, but I'm not sure for the test you're proposing.
I've just got a new handpiece for my desoldering station, so I'm ready to desolder chips and test them apart from the main unit if needed.
Cheers!
Chesh
Thanks again someone and Ernest. I was planning on working on this tomorrow night but I'm working on it tonight to see if I can get ahead.
Ernest, the base board is marked 1248-4-02W. I have not yet checked what (if any) mods have been done to this, other than the conversion I did to DRAM.
someone, I probed around IC11 and l can see it properly inverting on pins. I even plugged in the second probe on my scope to check. (Pin 1 High, Pin 3 Floating, Pin 5 data, Pin 8 High, Pin 10 High, Pin 12 data)
I'll start thinking about how to code up a test. I had an idea how to do the mem test, but I'm not sure for the test you're proposing.
I've just got a new handpiece for my desoldering station, so I'm ready to desolder chips and test them apart from the main unit if needed.
Cheers!
Chesh
John "CheshireNoir" Parker
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One Dark Little Kitten
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One Dark Little Kitten