Re: JiffyDOS and the 1541-II Drive

From: Marko Mäkelä (
Date: 2004-07-11 22:49:36

On Sun, Jul 11, 2004 at 01:40:31AM -0400, Jack wrote:
> >An original JiffyDOS package normally has both the original CBM DOS and
> >JiffyDOS switchable for compatability reasons,...
> Then this means that the drive he sold me has a hacked/bootleg/pirate
> JiffyDOS chip.  Is this assumption correct?

Not necessarily.  The 1541 clone Oceanic OC-118N contains a 23128 ROM (not
sure if it's PROM or mask-programmed ROM) with the CMD logo stamped on it.
Some of the data or address lines are permuted, presumably because earlier
versions of the drive had an unauthorized copy of CBM DOS.

> I knew that already.  And this chip lacks the CBM 2.6 DOS so JD cannot
> be switched out, correct?  



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