Re: Sega XY controls boards

-----Original Message-----
From: Mark E Davidson <mark@basementarcade.com>
To: vectorlist@synthcom.com
Date: Wed, 01 Jan 2003 22:19:58 -0800
Subject: VECTOR: Sega XY controls boards

>
> Here is another one. Space Fury running quietly off to the side as Im
> working on other game problems. That's when I hear the strange sound of
> the High voltage kicking in and out (aka, Segas version of the spot
> killer). Vectors are jumping all over the screen (when there is enough
> to turn on the HV on the G08. Hooking up the scope proved that the
> monitor was fine, and swapping board around with another machine
> narrowed it down to a bad XY controller board. This board also has the
> video ram on it as well. Is there a possibility at a certain ram might
> go bad to produce the described screen action? Or am I thinking the
> wrong way?
> The reason Im stuck on the 2114L ram right now is I had one go bad
> in Eliminator. The result was minor.. On 2 screens I was getting jumbled
> vectors on some text, and some for the eliminator explosion explosion
> screen too. Is is possible that I lost more then one ram giving me not
> enough screen to run test mode? Is there anyway to test 2114L ram?
>

unlike what many people think, 666 is not the number of the devil,
IT'S 2114!!!!!!!

they are so unreliable and touchy about loading and clockspeed that i NEVER use them in my pcb's,
i always replace batches of them with 6116 chips.

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Received on Wed Jan 1 19:29:34 2003