[Techtoolslist] RASTER: FW: Using 8080 pod on Midway 8080 boards (Space Invaders)

[David Shoemaker]

Any chance I could have you open one up and look at the ground lead on the
twisted pin cable?  I have an 8085 pod I tried to borrow the twisted pair
cable from and it has the shield ground tied to pin 20.  That doesn't work
on the 8080 as that pin is +5.  Ground should be tied to pin 2.  I am
wondering how they did that I suspect it is in the potted UUT end as I don't
see anything on the connector end.

David



-----Original Message-----
From: owner-rasterlist at vectorlist.org
[mailto:owner-rasterlist at vectorlist.org] On Behalf Of Alex Yeckley
Sent: Wednesday, February 20, 2013 4:15 AM
To: 'David Shoemaker'; 'Technical Tools Mail List'; jrr at flippers.com;
rasterlist at vectorlist.org
Subject: RE: [Techtoolslist] RASTER: FW: Using 8080 pod on Midway 8080
boards (Space Invaders)


>Do your pods have the twisted cable or the straight?  Both mine have 

>the straight.


Our 8080 pods have the OEM twisted cables.  Our 6502 pods (re: Clay's
Tempest question) come in both twisted and the flat cables.  I'm assuming
the flat cable is a non-factory replacement item, but could be totally wrong
about that.  The 6502 pod that failed just happened to have had a flat cable
but I'm confident the drive problem was unrelated; we found one specific
driver output that wasn't going sufficiently high once plugged into a "real"
target board.  It wasn't a general malaise of the address lines like you
might expect from transmission line losses or higher EMI susceptibility due
to the flat cable if that's what you are wondering.


>Are you using a 9010 or a 9100 to drive the pod?


Both...

Alex
----
ayeckley at elektronforge.com
www.elektronforge.com 


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