From: Mikael Holm (mikael.holm_at_se.danskebank.com)
Date: 2003-02-07 09:46:18
Hej Spiro and all...
I also read further down in Ray's document that a faulty power supply
could cause this malfunction... Is this correct?
I will test the computer with another power supply first, before trying to
find out how to look for shortings with a multimeter... (Mainly because I
don't know much about how to do that...)
//Mikael
-----------------------------------------------------------
Mikael Holm
mikael.holm@se.danskebank.com
Hello Mikael,
Mikael Holm wrote:
> I just received a C128 (220v PAL) and when I powered it up it just
> displays garbage on screen. All it displays is some random graphics (not
> really characters, but rather strange patterns) with different text and
> background colors. And all this is flashing and changing. And it won't
go
> to C64-mode when I hold down the C=-key while turning the power on.
[...]
> U11 315012-01 (8721) PLA (Programable Logic Array)
> No bootup in any mode. In 40 columns: blank screen, white screen,
> light blue screen (no border), random checkerboard pattern or flashing
> "garbage" characters.
That could be the problem.
> U18 390059-01 CHARACTER ROM
> No characters. Startup has border, but "garbage" where characters
> belong, or entire area inside border just lines or blocks.
I don't think so, since C= (for 64-mode) does not work, either. If it
just were the character ROM, this would have to work.
I would go for U11, but before doing so, I would go with a multimeter
and look for shortings between the various address- and data-lines
available at the processor.
Spiro.
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