Re: VIC-1541 problem

From: Andrew Wiskow (
Date: 2006-12-15 19:28:37

I'm not really sure if the problem was a conflict with
the ROM version, or if the ROM chip in that drive was
just failing.  All I know is that with the 03 ROM,
whenever it was hooked up with multiple drives, any
drive access to any device would cause the C64 to
hang.  I took the drive to a friend's house who has a
C128, and on his system, it seemed to work fine.  I
don't have a VIC-20, so I wasn't able to test it on
that.  I only have C64's at my house.  I tested it on
two C64's and one C64c, and it didn't work on any of
them.  But, after changing to an 05 ROM, it now works
just fine.


--- Marko Mäkelä <> escreveu:

> On Fri, Dec 15, 2006 at 07:45:39AM -0300, Andrew
> Wiskow wrote:
> > Well, for anyone who may care, my problem has been
> > solved!  I tried changing out the 901229-03 ROM
> chip
> > in the VIC-1541 with a 901229-05 ROM chip, and now
> the
> > drive works perfectly!  This had be scratching my
> head
> > for quite a while, so I'm so happy that it's
> working
> > now.  :-D
> Very interesting.  What were the exact symptoms? 
> Did you
> try the drive with a Vic-20 in a multi-device setup?
> At
> you can read my characterization of the 901229-03
> firmware:
> 'The firmware of an old-style 1541 with long board.
> This ROM has an
> autobooting feature: if CLK and DATA are held low
> during bootup, the
> drive will wait for them to raise, and execute a
> "&*" command.'
> You can also obtain 901229-01 and 901229-02 from
> that location.
> I never come across to a 901229-04.
> 	Marko
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