From: Spiro Trikaliotis (trik-news_at_gmx.de)
Date: 2003-02-07 09:21:24
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.
Message was sent through the cbm-hackers mailing list
Archive generated by hypermail 2.1.6.