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

[John Robertson]

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 :-#)#
>

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