From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2008-08-16 06:37:58
On Fri, 15 Aug 2008, Jim Brain wrote:
> I'm trying to reconcile some information that is confusing me about the
> various 1541* roms.
>
> On the 1541-II, there is a version on Zimmers called the
> 1541-II.355640-01.bin rom. It's a c000-ffff rom, which is normal for 41-II
> units. The text notes it's only used on Newtronics mechs.
>
> However, I split the file and did a compare to the other files. It appears
> this combined file is the same as:
>
> cat 1540-c000.325302-01.bin 1541-e000.901229-05.bin > newfile
>
> Which seems strange to me. I would think the 1541-II would have had some of
> the updates found in the other 1541-II drive
>
> Am I overlooking something?
I have no information on part number 355640-01, but this series of part
numbers was not in use at the time of the 1541-II, or even the 1541B and
1541C. As your compare shows, the contents are the same as the last
version of the 1541/1541A/SX64. It is possible that this ROM was used in
the first versions of the 1541B, which had a Newtronics drive.
It is also possible that someone used it as a replacement in the 1541-II,
since they are compatible and use the same drive mechanism.
It would be interesting to know whether this was a mask-programmed ROM or
an EPROM.
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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