Re: VIC-1541 problem

From: Marko Mäkelä (
Date: 2006-12-17 21:38:18

On Sun, Dec 17, 2006 at 01:11:14PM +0100, Spiro Trikaliotis wrote:
> Well, yes, there is. Anyway, I more expect the original ROM to be defect
> than this being the cause for the problems at first.

Thank you for your very detailed analysis.  When I archived the ROMs
a decade ago, I wasn't an expert of the serial bus protocol.  You
obviously are, given your involvement with the OpenCBM project.
I think that this could be checked fairly easily by installing the
-03 ROM to a 1541 (for example, using Nicolas Welte's flash ROM
card) and seeing if it works in a multi-device setup.

Given that Andrew reported the drive to work as the only device on the bus,
a ROM defect seems unlikely.

Andrew, could you write a small program to copy the $e000-$ffff ROM to
disk, and send the file to me or Spiro?  Or you could compare it yourself
to the copy of the -03 ROM on  There is a ROM checksum, but
the algorithm is very simple, so a defect can go unnoticed.


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