Re: 1541 to 2031 adapter (was no subject)

From: Giovi <>
Date: Fri, 20 Sep 2013 16:18:44 -0300
Message-ID: <B8B711EC8960417BA90BCC7F27BC15CA@giovixp>

after a visual comparing of hex code from the bin files on Zimmers, I can affirm the patched ROM is from the 1541-e000.901229-05 ROM, the same I have into my 1541.
The only difference between the one on the mashup site and mine, seems to be the different mechanism: I have the short board, pull-down door (Alps?).

I wish to try to manually patch the hex file, just to avoid errors (if any) on the patched ROM. But I've some troubles understanding how to run the program, which environment, etc.;
I tried to run it under Vice->C64 but I get an UEBERTRAGUNGSFEHLER  (transfer errors) after a while.

I have a possibly working board but it doesn't work and I can't find the mistake  :,-(

Does anybody here could try to run the .prg file included into the package at  and pass me the resulting hex file (or can give me some detailed info about how to extract the hex code from the DATA instructions of the basic program? I'm quite rusty with the C= basic (I'm quite rusty about basic, and that's all! :-)

many thanks,

p.s. anybody here wish to build the same board right now? ;-)

  ----- Original Message ----- 
  From: Steve Gray 
  Sent: Thursday, September 19, 2013 5:24 PM
  Subject: 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 2013-09-20 20:00:04

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