Re: plus/4 problems: continued

From: Hársfalvi Levente (
Date: 2001-12-14 11:07:29


Daniele Gratteri wrote:
> Well, I wrote to the person who asked me advice for solving his problem. So,
> now, he tried to substitute plus/4's TED with the one from a working C16.
> The problem still remains. He also told me that the keyboard doesn't accept
> input also after many hours of inactivity and that some days are needed for
> the keyboard to start to work again.

I'd first try to swap the power supply.

And second, if the problem still remains, I'd check actually _what_
characters are seen on the screen. This can give a hint on the defect

For example, if the characters are 'absolutely' random, this points to
something different than the RAMs (maybe a multiplexer, or the FPLA or
whatever). Maybe even shows _which_ multiplexer is defect. On the other
hand, if the effect is 'typical', this shows only one or two defect data
bits, e.g. one or two defect RAM chips.

Best regards,


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