[Techtoolslist] Undocumented Errors: 9010A with 6800 pod - error message on Bus Test "ADD ERR @ 0000-LOOP?"

[John Robertson]

Hi folks!

This is a new error message on me, and I am having a problem figuring 
out exactly what it means. No reference to it is the 9010A nor the 6800 
pod manuals under Bus Test - or any other test. Perhaps this was an 
added treat for version 3A?

Note that the R/W line is not tied low or high, all address lines seem 
fine. Pod reads 0000 just fine, but if I try to Write AAh to 0000 I get 
this error msg too, but not if I write 55h. Curious I then try writing 
01h, 02h, 04h (all good), 08h - nasty error message! Then again with 
10h, 20h, 40h, and 80h - all good. The problem turned out to be a tiny 
solder bridge between D3 and A2! Pity the Fluke couldn't say anything 
about that then this cryptic message.

This is the second undocumented error message I've found - we need to 
list them somewhere...I'll put them on the Fluke page on flippers, and 
folks are welcome to publish elsewhere although I do like a wee note 
that it was found on TTL.

Thanks!

John :-#)#

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