[Techtoolslist] Atari 6502A NOP adapter

[martin at guddler.co.uk]

Sorry guys, I should have said, I've got the doc. I've probably got  
the one you're pointing too as well John. But I'll pick it up from TT  
tomorrow if not, thank you.

Nice to see the same people still reading as were here in 2002 as  
well :)

OK. Tomorrow ill put more thought into comparing the two CPUs. The  
only thing that really springs to mind at the moment is maybe they've  
messed with the order of the address lines or something?

The really odd thing is I know for a fact I've fixed centipede boards  
in the past with my 5006.

Incidentally, I'm now using the 9100 for the sigs. I keep meaning to  
post the programs up on my website but they need some refining. Error  
trapping and the like. I've had it producing HP signatures for some  
time now.

I'll post back if I work anything out. Thanks for the pointers though.

Martin.


On Jan 24, 2009, at 20:39, John Robertson <jrr at flippers.com> wrote:


> martin at guddler.co.uk wrote:

>> Hi all,

>>

>> Just been trying to find information on what is different about the  

>> KK 6502 (Atari) NOP adapter that makes it produce 8080 signatures  

>> as opposed to the normal 6502 ones and I discovered that the  

>> question has been posed before - not surprising I guess.

>>

>> Just wandering if this mystery was ever solved and perhaps I'm not  

>> looking in the right places?

>>

>> I'm sure I once took down signatures from a working board using my  

>> standard 6502 adapter but as always, when I want them, I'm damned  

>> if I can find them so maybe I imagined it.

>>

>> In case anyone hasn't a clue what I'm talking about, see the  

>> footnote on page 14 of the PDF document "SigAnalNotes.pdf" that  

>> ought to be all over the net but I can't find a link to it just yet!

>>

>> The original TechTools list message where this was asked before is  

>> here (with no answer):

>> http://www.vectorlist.org/TechTools/2002/10/0035.html

>>

>> Thanks,

>> Martin.

>>

> Check the FTP archive on TTL (link below) for "Sig-Analy- 

> HPJMay77.pdf" this covers some Sig Analysis questions. I only have  

> info on the 6502, 6800 and Z80 NOP fixtures, which is at the rear of  

> "KK-Signature2.pdf" in the KurzKasch section of TTL.

>

> For your question I would print off the last two pages of the  

> KK_Signature2.pdf, then pull up info on the 8080, find out what  

> instruction gives NOP, and then compare the pinout with the 6502.

>

> John :-#)#

>

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