Ben A L Jemmett <[EMAIL PROTECTED]> writes:
>OK... MS-DOS 6.0x had DoubleSpace (algorithms stolen from Stac, no
decompress
>option, very unreliable).
Yes. However, I'll point out that the majority of the problems reported
with MS-DOS 6.0 (trashed disks) were not caused by DoubleSpace, but by
SmartDrive. The DOS 6 setup program installed SmartDrive as a write-back
cache by default. Folks who used badly-written REBOOT.COM utilities
instead of pressing Control-Alt-Delete got nasty surprises. (Yes, me too.)
Compressed drives tended to get trashed worse, that's all.
>MS-DOS 6.1x had no disk compression utility at all.
There was no MS-DOS 6.1x. There was an IBM DOS 6.1, which included a
*coupon* for SuperStor/DS (which eventually was included with IBM DOS 6.3.)
As I understand it, at the time when Microsoft was telling the world that
DoubleSpace compression was "integrated" and "built into" MS-DOS 6, they
were also telling IBM that DoubleSpace was a competely separate product
from MS-DOS 6, and therefore not included in IBM's license of Microsoft
DOS source. DoubleSpace doublethink! (Web browser parallels left as an
exercise for the student.)
>MS-DOS 6.20 and (IIRC) 6.21 had DoubleSpace (again, Stac's algorithms but
this
>time with a decompress option and 'DoubleGuard' which would pop up a message
MS-DOS 6.20 had the improved DoubleSpace. 6.21 didn't -- it was the post-
lawsuit, cover-our-butt release, and a funny DOS it was. DoubleSpace was
not included, and the help files were changed to reflect its absence. But
the kernel files were byte-for-byte identical with MS-DOS 6.20. COMMAND.COM
was hacked to display a slightly different version number. (Lie, that is.)
Otherwise, 6.21 was exactly the same as 6.20. If you have MS-DOS 6.21, you
*can* run the 6.20 version of DoubleSpace simply by coping the files from
another machine.
>like Open/DR-DOS has. As an aside, did DR DOS 6 have Stacker, or was it
>introduced with Novell DOS? I seem to recall DR advertising DR DOS 5 - or
>maybe 6 - as having 'UltraStor' or something similar technology, not Stacker.
SuperStor, by AddStor Inc. An earlier version of the same product in IBM
DOS 6.3. DR DOS 6 also included Multisoft's Super PC-Kwik disk cache.
If nothing else, Novell's purchase corrected a lot of misspellings!
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