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@flippers.com> Sent: Apr 1, 2018 6:29 AM To: "techtoolslist@flippers.com" <techtoolslist@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@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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