Re: R: Pet problem ..

From: Martijn van Buul (
Date: 2000-09-25 10:11:19

Mario wrote:
> And you have any idea for the garbage screen ?? I found an article ( i don't
> remember ... may be yours ..) in which was suggested that the problem could
> be the 6502 or the roms ??

A garbaged screen can be caused by many a reason, including a bad power
supply. My 4032 once had this: One of the 7805s was shot (it has two of
them!), causing only garbage. It took me a while to find that out, though:
I measured Vcc over the first 74LS chip I could find, which just *happened*
to be part of the video system, and was fed from the -working- 7805..

Replace both of those 7805s, and see what happens.

    Martijn van Buul - -
	 Geek code: G--  - Visit OuterSpace: 3333
   Kees J. Bot: The sum of CPU power and user brain power is a constant.
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