Re: JiffyDOS and the 1541-II Drive

From: Jim Brain (
Date: 2004-07-11 17:02:52

Jack wrote:

>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
>Thanks for comments
>       Message was sent through the cbm-hackers mailing list
I have the same thing here, but it's for a SX-64 unit.  The 64 ROM has a 
switch, but the 1541 ROM has no switch.

Can you divulge who you bought it from via email?  We may both be 
getting units from the same person...


Jim Brain, Brain Innovations                      
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times!

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