Re: 264 series questions

From: Marko Mäkelä (
Date: 1999-10-06 10:11:42

On Wed, 6 Oct 1999, Nicolas Welte wrote:

> I just realized I'll also have to get or bring a little TV/video
> monitor or otherwise I won't be able to enter programs :-(

Luckily the plus/4 has a built-in machine language monitor, so you don't
necessarily need to bring a disk drive as well. :-)

> Then probably a 6522 (probably only with some tweaking like in the C64)
> and 6526 should also work, but perhaps with broken timers.

The 6526 most certainly does work with a broken clock.  I had trouble with
the keyboard in my C128D.  I have lifted the $dc00 CIA on a daughter card
that is used for interfacing the 6821 PIA that controls the 1 MB memory
expansion.  For some reason, the connection of the clock signal was weak.
In the C128 mode, the keyboard worked occasionally (I guess whenever the
CIA got some clock signal), but in the C64 mode, there was no blinking
cursor, since the C64 KERNAL is driven with interrupts from the $dc00 CIA.
The C128's screen editor uses raster interrupts.


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