RE: Need help fixing a C128 DCR

From: Baltissen, GJPAA (Ruud) <>
Date: Fri, 25 Jun 2010 07:55:04 +0200
Message-ID: <>
Hallo Laze,

> I even tried typing LOAD"$",8 (a few times actually, to
> make sure I didn't mistype anything).

So if you type something, it doesn't show up? IIRC the 40/80 column
button is read by the CIA as well. No IRQ -> no reading of the keyboard
-> no mode switching + no typed chars on the screen. Again: CIA (or

> The normal start-up sequence.

For sure: this means the rattling of the drive as if it is looking for
something? This would mean that one CIA is OK. 

@all: does sending commands to the drive also involve the need of IRQ's?
Being very familiar with drives doesn't mean being familiar with the
sending protocol as well :) If IRQ is NOT involved: again CIA. If it is,
it would mean that an IRQ is generated. Generated by the CIA that should
read the keyboard. A CIA with a completely brooken port could cause this
behaviour (I had once a 6522 behaving like this).

> ... that I try to leave as few fingerprints on it as possible.
> Using saliva is out of the question. :)

Bill is not asking you to spit on it. And so far it seems you have to
desolder the keyboard CIA, which means a lot of fingerprints.....

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Received on 2010-06-25 06:00:14

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