General Category > Lisa Troubleshooting and Repair
CPU 42 error...
bmwcyclist:
stepleton, Thank you! Excellent review and great to know.
I NOW HAVE THE BOARD WORKING!! :)
I found my mistake.
The CPU I bought was not what I received. I asked for a MC68000L10 but it is a MC68010L10.
I put in a new MC68000L8 and now it is working great!!
Anyone want to buy a good working CPU board???
Thank you for your help everyone! If it were not for the suggestion to swap the CPU again I would have not caught my mistake for some time.
I am going to let it run all day with a screen saver or something, play some games, maybe draft an article tomorrow, to let it burn in and make sure it is trustworthy before I try to sell it.
jamesdenton:
Good catch!
Also relevant: https://lisalist2.com/index.php/topic,43.msg159.html
sigma7:
For posterity... with the 68010 installed, after error 42, continuing to try to boot MW+II from the parallel port hard disk results in error 75 after "Hold down space bar or mouse button to adjust startup configuration".
--- Quote from: bmwcyclist on March 23, 2025, 09:15:27 am ---I made a video that includes the startup tone and a walk-through of trying to boot.
https://youtu.be/GJHmPptvQhc?si=y2Up7WxvseUwC9oT
--- End quote ---
Given that fakes, counterfeits, and "re-marked" salvage chips are around, if you see this behaviour with a part marked 68000, then I'd guess it is actually a 68010.
Also beware when ordering by part number that there is a Motorola 6800 processor (in a smaller package), the Lisa uses the 68000. The speed of the CPU board is just over 5MHz, so speed grades 6,8,10,12, and 12F will work.
edit: added 6800 & speed grade info
bmwcyclist:
--- Quote from: jamesdenton on March 23, 2025, 02:15:50 pm ---Good catch!
Also relevant: https://lisalist2.com/index.php/topic,43.msg159.html
--- End quote ---
You got the good catch, I didn't get a FISH! :o
bmwcyclist:
--- Quote from: sigma7 on March 23, 2025, 02:21:14 pm ---. The speed of the CPU board is just over 5MHz, so speed grades 6,8,10,12, and 12F will work.
--- End quote ---
12F ?
Foxtrot?
What does the F get you?
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