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

[John Robertson]

Hi Andrew,

The ftp site moved a while ago - on your side of the pond now!

FTP site is: 
ftp://ttl.arcadetech.org/TTL/Test_Equipment/Fluke/PDFs/Training_and_Troubleshooting/

Thanks for destroying the value of your NOS adapter (will someone please 
treat Andrew to a cup of tea?), we all appreciate it! I've uploaded a 
zip version (in case some folks are .rar challenged) to the above 
mentioned directory.

John :-#)#


Andrew Welburn wrote:

>  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 at flippers.com

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

>>>>> Robertson

>>>>> Sent: Sunday, February 17, 2013 7:23 PM

>>>>> To: techtoolslist at 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 at 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 :-#)#

>>

>>

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>>

>

>



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