[Techtoolslist] midway 8080 ram test card instructions

[teeray]

John,

Looks like the Midway RAM Test ROM posted on the TTL site has bit 0 stuck high.

Thanks



-----Original Message-----
>From: John Robertson <jrr at flippers.com>
>Sent: Apr 1, 2018 6:29 AM
>To: "techtoolslist at flippers.com" <techtoolslist at flippers.com>
>Subject: Re: [Techtoolslist] midway 8080 ram test card instructions
>
>That photo is of my old 8080 RAM test card that I posted somewhere years 
>ago...I may have some printed info on the test somewhere. I have two 
>cards one hacked and the other in good condition, but haven't seen them 
>since I moved the shop last May - should be able to turn the cards up 
>Monday though when I am back at the shop. Send me a note if I forget to 
>post.
>
>I did upload the ROM code to the TTL FTP site, look under /Midway/Ram 
>Test, and I just uploaded some pictures showing more of the hacked card, 
>and my good card in action. As I recall, and it has been years, the LED 
>at C1 shows "h" or "L" for High/Low and the LEDs at B1 & A1 are the 
>location. Maybe...
>
>I also just uploaded to /Midway/Ram Test info on a Space Invaders test 
>ROM that was dumped by Paul Sommers May 2001 and confirmed working by 
>Chris Hardy. The code is different from the 8080 RAM test ROM image.
>
>John :-#)#
>
>On 2018/03/31 7:43 PM, davids at oz.net wrote:
>> That picture is missing a cable that goes from the card to the first rom. And that’s all I know 😊
>>
>> Sent from my Windows 10 phone
>>
>> From: tonyhtbsusa
>> Sent: Saturday, March 31, 2018 7:26 PM
>> To: 'Technical Tools Mail List'
>> Subject: [Techtoolslist] midway 8080 ram test card instructions
>>
>>   
>>
>>   
>>
>>   
>>
>> Anyone have the instructions for this 8080 ram test card
>>
>> http://arcarc.xmission.com/Test%20Equipment/Midway%20Ram%20Test%20PCB.jpg
>>
>> tony
>>
>> hi-tech arcade repair
>>
>>   
>>
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