Re: VIC-1541 problem

From: Andrew Wiskow (
Date: 2006-12-18 00:40:45

Marko, I'm afraid that all that is a little beyond my
knowledge.  I'd be more than happy to mail the ROM to
you if you'd send me your mailing address via e-mail. 
Consider it my Christmas present to you!  ;-)


--- Marko Mäkelä <> escreveu:

> 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.
> 	Marko

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