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Diagnosing Error Codes Franklin ACE

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  Diagnosing Error Codes Franklin ACE by Bill Degnan - 06/05/2012 08:31
The Franklin ACE 1200 computer was an Apple II clone. This system has the version 2.3 ROMs. Click image for larger view.


This is the persistent error code that appears on the screen when attempting to boot an Apple II diskette in drive 1.


NEXT: Determine what the error codes mean, and repair. I am guessing I have bad RAM, 3715 could be a RAM memory address, the other codes probably represent diagnostic values that explain the error, the pointer or stack value at the time of the error, or something like that. We'll see.

Here is a link to the Apple Monitor program. The Franklin was cloned from the Apple and I believe the ROM monitor should be the same
http://apple2.info/wiki/...hp?title=System_Monitor


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  Repair tool: The Thumb by Bill Degnan - 07/27/2012 11:18
Opened chassis.
Re-seated RAM chips
System boots to DOS 3.3

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  Franklin ACE RAM - MK4315N by Bill Degnan - 07/30/2012 18:57
Although I can now boot to disk, sometimes, inconsistent performance out of the RAM is frustrating, so I decided to find the bad chip(s) and replace them. Hoping it's RAM only. The replacement RAM is MK4315N, not easy to find, but I happen to have a few. I also took new pictures of the cards installed in the system, so that I knew how to put things back together

Apple Super Serial II
Franklin ACE 80 (z80)
Franklin disk drive controller

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