Re: 8250 and C64 disks

From: Nicolas Welte (
Date: 2006-03-29 07:16:04

> --- Ursprüngliche Nachricht ---
> Von: Claus Just Rasmussen <>
> An:
> Betreff: Re: 8250 and C64 disks
> Datum: Tue, 28 Mar 2006 21:35:13 +0200
> A combination - some 4040 disks and also imgrd, I'm afraid. The 4040 
> disks explains itself, the imgrd problem was/is that if I specify a 
> filename in actual path, then it'll be overwritten by something <2KB.

Strange. I never had this problem here. But that's for using a program on
only a single machine. You never know what happens on the next one! But I'll
have another look into the source if there is something obvious.
> I managed to get my hands on a 4040 so now I've got the HW in place to 
> read the disks. Really nice.
> Next question: Do a 4040-version of imgrd exist? If not - will I need to 
> change more than the #sectors,tracks? (bitclock?)

Of course the map of sectors per track and number of total tracks has to be
fixed. Then some minor changes for the filename extension (d64), and the
autodetection of doublesided disks has to be skipped. I use some 6502 code
that gets downloaded into the drive, I have to check if this is usable on
the 4040.

If you don't feel like hacking into the source code, I can have a look and
add an option -40 to support the 4040 drive and disk layout. (I'm sure a
2031 drive can't be supported so easily, because my 6502 drive code had to
be changed to the completely different memory layout of the drive).


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