Re: Transfer a 8250 diskette

From: William Levak <wlevak_at_SDF.ORG>
Date: Mon, 14 Nov 2011 04:56:51 +0000 (UTC)
Message-ID: <Pine.NEB.4.64.1111140450270.8780@sdf.lonestar.org>
On Sun, 13 Nov 2011, Spiro Trikaliotis wrote:

> * On Sat, Nov 12, 2011 at 10:01:09PM +0100 Gerrit Heitsch wrote:
>> On 11/12/2011 09:53 PM, Spiro Trikaliotis wrote:
>
>> If you have a 1541-II, you're safe since those only came with the
>> -03 ROMs where the bug is fixed. Otherwise don't do it.
>
> How do you know (w/o opening the drive) that noone replaced the ROM for
> some reason?

Use the drive's memory read command to read locations 65254 and 65334.

             ROM     65254  65334
1540     325303-01    96    170
1541     901229-01   253    170
1541     901229-03    14    170
1541     901229-05    62    170
1541     251968-01   121    138
1541-II  251968-03   121    133


wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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Received on 2011-11-14 05:00:14

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