RE: Need help fixing a C128 DCR

From: Bil Herd <>
Date: Thu, 24 Jun 2010 15:29:22 +0000
Message-ID: <>
Are you describing the color RAM for the 40 column VIC or do you mean you get random colors on 80 column?

-----Original Message-----
From: [] On Behalf Of Laze Ristoski
Sent: Thursday, June 24, 2010 8:47 AM
Subject: Need help fixing a C128 DCR

Hello everyone,

I asked this question elsewhere and so far I was told to replace the RAM.
But I'd like some more hints so as to avoid raping the PCB too much. :)

The C128 screen shows up (Basic V7, etc) but with randomly colored chars (not flashing though), and no cursor shows up. The floppy drive seems to finish its start-up sequence no problem. I've tried using a C64 cartridge, holding down Commodore key during start-up and switching to 80-column display, but the results are always the same (ie. always getting the 40-column C128 mode). So far I replaced the MMU, PLA and VIC, but without any luck. None of the chips are getting abnormally hot. The VDC seems to produce no signal, or at least that's what my TV-set says (I use the monochrome output). I'm not sure if a faulty VDC can cause these symptoms.

Any ideas what might be failing?


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Received on 2010-06-24 16:00:11

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