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Macintosh Classic Sad Mac RAM expansion error

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Morning all,


I've tried a few searches on this site and on Google directly, but I can't seem to find a reference for Sad Mac error codes for the Macintosh Classic. For the SE and Plus yes, but not the classic directly. Or, perhaps I have misinterpreted what I was reading and maybe just need to have someone nudge me in the right direction? I have one Classic that will boot fine without the RAM expansion installed. With the RAM expansion installed I get a Sad Mac with the following code:





Following this document here: https://udcf.gla.ac.uk/~gwm1h/Error_Codes/Sad_Mac_Codes.html

It says: "$05    - RAM external addressing test failed. Minor error code indicates a failed address line." which follows that this only happens when the RAM expansion is in. The lower numbers should be the address line that I should be checking.  But how do I translate 00100000 into a trace on the motherboard that I should be checking for continuity? 


Any advice would be welcome. Thanks in advance.

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I've got a similar problem, but without the second line (00000000)

Did you fix your problem, and (if yes) how ?

My recapped classic boots fine without the ram expansion in, but boot with this memory error when inside. 



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