17-08-2022, 05:12 PM
So I got carried away last night.
The "M" key is definitely dead, (Millions of ohms when depressed) which could explain why I'm not getting into the monitor. I'll probably wire in a temporary momentary switch there as part of testing.
The Core board is a 8342-4-04CR (So late model)
The Main board is a 8501-3-04CR (So mid model)
ROM version is BN56.
If I swap the core board from my 128k standard (8342-3), will I need to add the earth strap? Doesn't look too hard but it might get a "temporary" one until I can find the right connector.
Anyway I'll potter on over the next few evenings. I have the RAM tester ROM, and a proper Oscilloscope as well as the board lifters so I'm much more prepared this time round.
John
The "M" key is definitely dead, (Millions of ohms when depressed) which could explain why I'm not getting into the monitor. I'll probably wire in a temporary momentary switch there as part of testing.
The Core board is a 8342-4-04CR (So late model)
The Main board is a 8501-3-04CR (So mid model)
ROM version is BN56.
If I swap the core board from my 128k standard (8342-3), will I need to add the earth strap? Doesn't look too hard but it might get a "temporary" one until I can find the right connector.
Anyway I'll potter on over the next few evenings. I have the RAM tester ROM, and a proper Oscilloscope as well as the board lifters so I'm much more prepared this time round.
John
John "CheshireNoir" Parker
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One Dark Little Kitten
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One Dark Little Kitten