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

[John Robertson]

David Shoemaker wrote:

> Hmm, ok well that doesn't bode well for my pods.

>

> I can't get anything close to a reliable memory test and no Run UUT success.

> I often get pod power failure.  This is on a known good working board set.

>

> Both my pods have the short flat cables.  I see another 8080 up on ebay with

> a longer twisted pair style cable but they are asking $200 for it.  No way I

> am doing that at this point.

>   

Ah, well that is different. I too have had trouble with the pods on the 
Midway 8080 systems. Have you tried the resistor trick that Andrew 
pointed out? I'm going to be testing a reluctant board set soon and am 
looking forward to getting reliable RAM etc tests. I do have the Midway 
RAM Test card and that is a big help, but it would be best if the pod 
worked properly.

Short flat ribbons work fine on my Z80 pod running a Galaga so I see no 
reason they wouldn't work on an 8080 pod. The advantage to the twisted 
pair cable is it can be longer making it easier to move the pod out of 
the way.

John :-#)#

> -----Original Message-----

> From: techtoolslist-bounces at flippers.com

> [mailto:techtoolslist-bounces at flippers.com] On Behalf Of John Robertson

> Sent: Thursday, February 21, 2013 9:15 PM

> To: techtoolslist at flippers.com

> Subject: Re: [Techtoolslist] RASTER: FW: Using 8080 pod on Midway 8080

> boards (Space Invaders)

>

> David Shoemaker wrote:

>   

>> What I am trying to figure out is are both my pods bad (which I doubt 

>> as two are behaving the same way) or is my 9010.

>>   

>>     

>

> If you are wondering if the base (9010/9100) affects the Run UUT command the

> answer is no. When the pod is in the RUN UUT mode it is entirely independent

> from the base - other than it can be over-ridden with a command - it does

> not talk to the base at all. This is covered somewhere in the manuals...

> Some of the manuals are searchable - look up RUN UUT and see what is

> written, pretty sure I've remembered it correctly. All the base does is tell

> the CPU where the Reset Vector is, after that the pod is on it's own.

>

> John :-#)#

>   

>> -----Original Message-----

>> From: prvs=1763d5e072=ayeckley at sierralobo.com

>> [mailto:prvs=1763d5e072=ayeckley at sierralobo.com] 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

>>

>>

>>

>>

>>   

>>     

>

>

> --

> John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 Call

> (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)

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> "Old pinballers never die, they just flip out"

>

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>

>

>   



-- 
John's Jukes Ltd. 2343 Main St., Vancouver, BC, Canada V5T 3C9 
Call (604)872-5757 or Fax 872-2010 (Pinballs, Jukes, VideoGames)
                 www.flippers.com 
"Old pinballers never die, they just flip out"