9 May
2009
9 May
'09
8:12 a.m.
----------------------------------------
Date: Fri, 8 May 2009 19:14:59 -0400
From: snhirsch at gmail.com
To: cctech at classiccmp.org
Subject: Re: Xerox 820 system disks in Teledisk format?
Back to the original subject:
I have IMD chugging away merrily on the Compaticard and, thanks to some
advice from Dave, can use it as the secondary controller.
Now, I'm trying to figure out how to format a SSDD diskette for the Xerox.
They use a screwy format where track 0 is FM 128 bytes/sector (26 x 128)
and all the others are MFM 256 bytes/sector (26 x 256).
Is there a way I can kludge through this with IMD? Or, do the Xerox
system utilities actually reformat track 0 when you sysgen (in which case,
it really doesn't matter what track 0 is configured as)?
Steve
Hi
I do this for images on my code I wrote for images
of my Olivetti M20. I think I have different sector
sizes but I do this.
Dave's tool handles this as well. I recall we added
the ability to have different sector formats. If you
have the images in his format or can convert them,
his tool would be the best way to go. My code seems
to be a little particular about what machine it runs
on.
As I recall you specify the different format of the
first track.
In any case, you'll need a machine that supports
FM. Not all PC machines do this.
Dave has a program that checks to see if the controller
support FM as well.
The reason for the FM on the fist track was that it
was then compatable with boot code for disk that
were all FM. One could boot FM and then switch to
MFM for the rest of the disk. It seems strange now
but made sense at the time.
Dwight
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