RE: JiffyDOS and the 1541-II Drive

From: Mike Paull (
Date: 2004-07-11 07:06:33

what he means is that you can use a JiffyDOS upgraded drive on a non
JiffyDOS C64 without any problems. Naturally you don't get the speed
advantages if your C64 has a stock kernal.

An original JiffyDOS package normally has both the original CBM DOS and
JiffyDOS switchable for compatability reasons, some programs might not work
with JiffyDOS so at least you can switch it out.


> -----Original Message-----
> From:
> []On Behalf Of Jack
> Sent: Sunday, 11 July 2004 1:32 PM
> To:
> Subject: JiffyDOS and the 1541-II Drive
> Has anybody here ever encountered a JiffyDOS revision for the 1541-II
> that doesn't require a switch?
> I just received a 1541-II with Jiffydos, but no switch.  I've never
> heard of this, so I wrote the seller back, inquiring about it.  He
> replied:  "...the jiffy dos that is installed in your unit does not
> have the switch.  it works automatically when a jiffy dos system is
> used & normal dos operation for non-jiffy systems..."
> AFAIK, only the 1571 and 1581 incorporated autoswitcing. I opened up
> the unit and had a look.  The EPROM is a 27C128. It is labeled
> "JiffyDOS 6.01"  Is this chip for real, or is the guy selling me a
> line?
> Thanks for comments
> -Jack-
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