Cromemco CDOS format (was Osborne-1 SD format)

From: mhstein_at_canada.com <(mhstein_at_canada.com)>
Date: Mon Feb 21 02:33:05 2005

--------Original Message:

> Date: Sun, 20 Feb 2005 11:08:09 -0500
> From: Dave Dunfield <dave04a_at_dunfield.com>

<snippage>
 
> In the meantime, I have been looking at a Cromemco CDOS disk (5.25"),

<snip
 
> ... it looks like there might be something
> slightly non-standard about the CDOS disk format... (anyone know?)

----------------
Well, I looked at a CDOS disk with RDOS and as far as I can see, a
5 1/4" disk formatted as double-sided, double density (like yours) has:

Track 0, Side 0: SD, 128 bytes/sec, 18 sectors, no interleave (1-2-3 etc.)
Track 0, Side 1 and all subsequent: DD, 512 by/sec, 10 sec, interleave 4
(1-5-9-3 &c)

Non-standard enough for ya? Standard for Cromemco, who always did like to
do things a little differently :-\

Note that density/sides are format options, so a CDOS disk could be SS/SD,
SS/DD,DS/SD or DS/DD (except for track 0, side 0, which is always SD)

Hope it helps (BTW, didya get that disk copied to 8" OK?)

mike
Received on Mon Feb 21 2005 - 02:33:05 GMT