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

[David Shoemaker]

I missed the resistor trick, will have to try that tomorrow.

Have you backed up the midway test card rom?  I saw a picture of that board
and it looks pretty darn simple to reproduce but I didn't have a copy of the
rom image.

David

-----Original Message-----
From: techtoolslist-bounces at flippers.com
[mailto:techtoolslist-bounces at flippers.com] On Behalf Of John Robertson
Sent: Thursday, February 21, 2013 10:10 PM
To: techtoolslist at flippers.com
Subject: Re: [Techtoolslist] RASTER: FW: Using 8080 pod on Midway 8080
boards (Space Invaders)

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)

>                  www.flippers.com

> "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"

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