[Techtoolslist] Atari 6502A NOP adapter

[John Robertson]

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 :-#)#

-- 
How to subscribe or unsubscribe from TTL 
http://seven.pairlist.net/mailman/listinfo/techtoolslist
FTP site is: ftp://ftp.flippers.com/TTL/TestEquipment