PetDisk (was Re: Re: 1541 to 2031 adapter (was no subject))

Date: Thu, 19 Sep 2013 22:42:49 +0200 (CEST)
Message-ID: <18062269.28350.1379623369160.JavaMail.www@wsfrf1224>
Hi, friends

As Giovi is talking about the Petdisk (from, I am wondering if someone had (recent ?) news from the author of this interesting hardware or possibly could forward me his "live" mail.

I'm trying to order one since a big while now without success ... the only answer that I had once was that he had trouble to get some parts ...

Regards - Hervé

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Message du : 19/09/2013 22:25
De : "Steve Gray " <>
A : "" <>
Copie à : 
Sujet : Re:  1541 to 2031 adapter (was no subject)


I have not done this mod but I'm wondering which version of 1541 did you use? Is it possible that the "patched" rom is for a different rom pair? I can't see any reference to which is the correct part# for the ROM that doesn't require changing. Did you use the ROM from the MASHUP site or did you run the patch routine on your existing ROM?


   From: Giovi <>
 Sent: Thursday, September 19, 2013 3:42:38 PM
Hi folks!

my name is Giovi (Giovanni Verrua), italian, C= collector, I live in Brazil 
and I'm new to this list.
As Ruud Baltissen (that should receive this post, if I'm right...hi Ruud!) 
already discovered, I'm not an hardware expert; dummy should be most the 
correct word :) so I apologize if my further posts will be silly in some 
way. I  also apologize if I will do some mistakes posting to this mailing 
list. Don't be shy, correct me whenever is needed!

My first question to this list is about the 1541 drive modified for the 
IEEE-488 interface (in other words, about connecting a 1541 to a PET), this 
also described at this page:,where 
I downloaded the patched ROM.

I'm writing this post because, of course, mine doesn't work :)  - I checked 
it twice and I haven't found (yet) the mistake. I will check it again. No 
answer from the 1541 and no reset when the 8032-sk is switched on or  off.

I'm sure that:
- the 1541 drive is ok
- the 6522 is ok
- the socket adapter is ok
- the EPROM im programmed returns no difference if compared with the patched 
rom image (so I believe it's ok too)
- the ieee cable an connectors are ok
- the ieee-488 port of the 8032 is ok since it works fine with the Petdisk 

>>> The question for you: >>> I have a little doubt about the patched ROM: 
>>> it's showing a different behavior respect the original 901229-05 ROM.

- with the original ROM, as usual, the floppy starts to spin and the red 
light comes on; after few seconds, the light and the spin motor go off in 
the same moment. Normal behavior for this kind of drive.

- with the patched ROM (with or without the ieee interface) the floppy just 
spins for a while and then stops, while the red light stays on for a longer 
time (and then goes  off).

Anybody of you C=hackers made this adapter in the past, and can tell me at 
least if the patched ROM shows this different behavior?


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Received on 2013-09-19 21:01:13

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