Re: RASTER: FW: Using 8080 pod on Midway 8080 boards (Space Invaders)

  Why can't i see anything in the flippers ftp today ?

  Opening a 30 year old packet! should i? how dare you suggest it! i'll
let out the 1983 air! i need my hazmat suit and breathing apparatus..

  I just opened it... its value has dropped 1000%. Its now worth $1 :(

http://www.andysarcade.net/pix/9000A-8085adapter.rar

Unfortunately not much interesting info there... no schems... but i
opened it all up and took photos.. stick it on the FTP somewhere i guess..

useful?

Andrew Welburn
http://www.andys-arcade.com

On 04/03/2013 16:33, John Robertson wrote:
> Andrew Welburn wrote:
>> Just to round this discussion off.. i have this adapter (unused) :
>>
>> http://www.andysarcade.net/pix/9000A-8085uutadapt.JPG
>>
>> to quote:
>> "Improves clock signal quality between UUT and the pod by reducing the
>> effects of capacitive loading"
>>
>> Proof that there are instances where a pod wont work quite right
>> in-circuit. It is rare, but some circuit designs are on the edge and
>> the pod can tip the balance.
>>
>> Andrew Welburn
>> http://www.andys-arcade.com
>
> Hi Andy,
>
> Feel like opening the package and sharing a PDF of the instructions?
> Probably includes a schematic of the mod which may help others (like me)
> figure out a simple way to improve Pod response...although it may simply
> be a kit made by Fluke based on their technical tip guide B0151 which
> has suggested mods:
>
> (ftp) Fluke/PDFs/Training_and_Troubleshooting/B0151-Guide to 8085
> Troubleshooting.pdf
>
> Thanks!
>
> John :-#)#
>>
>> On 19/02/2013 04:12, John Robertson wrote:
>>> David Shoemaker wrote:
>>>> The pod has a -1 CPU in it which should be good to 3 mhz the board is a
>>>> straight 8080a which should be 2mhz. But I tried it with the CPU from
>>>> the
>>>> board just for completeness. No improvement. And the pod cpu works
>>>> fine in
>>>> game.
>>>>
>>>> I have one board that will at least start up partially with the pod,
>>>> but two
>>>> others that just error on Run UUT.
>>>>
>>>> It is really inconsistent. I think the way the memory system works the
>>>> fluke
>>>> ram test will never work (strange timing and sync to get the game board
>>>> rotation stuff to coordinate access to ram).
>>>>
>>>> I have two of these pods, both use the flat ribbon. I tried subbing a
>>>> twisted ribbon from an 8085 pod but the pod fails self test (I suspect
>>>> the
>>>> ground lead is mucking with something).
>>>>
>>>
>>> I was testing an 8080 board only last year, but didn't get it booting,
>>> so it is sitting waiting for me to take another go. I can't recall doing
>>> the "Run" on any of the 8080 boards recently so haven't any better ideas
>>> at the moment...
>>>
>>> Perhaps someone else here has a suggestion?
>>>
>>> John :-#)#
>>>> -----Original Message-----
>>>> From: techtoolslist-bounces@flippers.com
>>>> [mailto:techtoolslist-bounces@flippers.com] On Behalf Of John Robertson
>>>> Sent: Sunday, February 17, 2013 7:23 PM
>>>> To: techtoolslist@flippers.com
>>>> Subject: Re: [Techtoolslist] RASTER: FW: Using 8080 pod on Midway 8080
>>>> boards (Space Invaders)
>>>>
>>>> David Shoemaker wrote:
>>>>> So my mails to tech tools don't appear to be getting through. But
>>>>> this is a raster game so I will cross the stream.
>>>>>
>>>>>
>>>>>
>>>>> *From:* David Shoemaker [mailto:davids@oz.net]
>>>>> *Sent:* Saturday, February 16, 2013 12:20 AM
>>>>> *To:* 'Technical Tools Mail List'
>>>>> *Subject:* Using 8080 pod on Midway 8080 boards?
>>>>>
>>>>>
>>>>>
>>>>> I have a fully working space invaders board which when I hook the pod
>>>>> up to and do Run UUT doesn't, it starts up and crashes.
>>>>>
>>>>>
>>>>>
>>>>> Pod passes self test.
>>>>>
>>>>>
>>>>>
>>>>> Anyone ever done this?
>>>>>
>>>>>
>>>>>
>>>>> David
>>>>>
>>>> Try a faster 8080 CPU in the pod, or try substituting the 8080 from
>>>> the game
>>>> in place of the pod CPU. It is possible the CPU is bad or slower
>>>> than the
>>>> system can handle.
>>>>
>>>> Do you have the flat ribbon cable from the pod to the CPU socket or the
>>>> twisted pair cable? The twisted pair cable handles noise better and
>>>> will
>>>> work in situations when the simple flat cable won't, plus it can be
>>>> longer
>>>> as a result.
>>>>
>>>> David, I have no idea why this did not show up in TTL - you are
>>>> subscribed
>>>> under the same email address as you posted here. I haven't seen any
>>>> bounces
>>>> for your email address.
>>>>
>>>> John :-#)#
>
>
> _______________________________________________
> Techtoolslist mailing list
> Techtoolslist@flippers.com
> http://seven.pairlist.net/mailman/listinfo/techtoolslist
> FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment
> Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
>
_______________________________________________
Techtoolslist mailing list
Techtoolslist@flippers.com
http://seven.pairlist.net/mailman/listinfo/techtoolslist
FTP site is: ftp://ttl.arcadetech.org/TTL/Test_Equipment
Archive site: http://seven.pairlist.net/pipermail/techtoolslist/
Received on Mon Mar 4 12:27:50 2013