OK, it wasn't new - I had posted about this back in 2021 (getting forgetful...sigh) I've posted this on flippers under Fluke and this is the text which if someone wants to work on it please feel free to do so, this is sort of raw notes: -------------------------------------------------------------- Undocumented error messages on the 9010A: 9010A with xyz pod - error message on Bus Test "ADD ERR @ 0000-LOOP?" 1) 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 above error msg, 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. Solution: The problem turned out to be a tiny solder bridge between D3 and A2! Pity the Fluke couldn't say anything about that other than this cryptic message. 2) 'More' work on this error message (Use the MORE key to get here): Pressing the MORE key gives me "ADDR BITS 0100 - LOOP?" so I assumed this was some sort of a decode issue and will proceed accordingly. Just thought I would post it here in case anyone else runs across this rare error message which I assume was added to the 3A ROMs in the 9010, but not to the manual - at least the copy I have... (later) It was indeed a problem with some address lines. For only A7 and A8 when loop reading @ 0000 (easiest - all should be Low) with the 9010 probe (set to Address) the Low light was flickering, not steady Low. Turned out to be a 74LS367 that had two inputs that were somehow pulling the lines slightly high. This did not show up when doing a ROM or BUSS test - only in either of the RAM tests. Ran into this "ADDR ERROR @ 0000-LOOP? another time, this time it was an Address line (A5) shorted to a Data line (D7). It doesn't matter which Data line the address line is shorted to, it sometimes gives the following message: Any Data line shorted to A0 gives/More ADDR BTS 0001-LOOP? Any Data line shorted to A1 gives/More ADDR BTS 0002-LOOP? Any Data line shorted to A2 gives/More ADDR BTS 0004-LOOP? Any Data line shorted to A3 gives/More ADDR BTS 0008-LOOP? Any Data line shorted to A4 gives/More ADDR BTS 0010-LOOP? ... Any Data line shorted to A15 gives/More ADDR BTS 8000-LOOP? ---------------------------------------------------------------------------------------- If I ever have free time I'll muck around and get more clarification, but too many jobs and not enough time! John :-#)# On 2025-01-10 4:24 p.m., John Robertson via Techtoolslist wrote:

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 :-#)#

-- John's Jukes Ltd. 7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 Call (604)872-5757 (Pinballs, Jukes, Video Games) flippers.com "Old pinballers never die, they just flip out" _______________________________________________ Techtoolslist mailing list Techtoolslist@flippers.com https://pairlist7.pair.net/mailman/listinfo/techtoolslist FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment Archive site 2005-Current: https://seven.pairlist.net/pipermail/techtoolslist/ Vectorlist Archives 1997/99 - 2016: https://www.vectorlist.org/