Date   : Sun, 16 Oct 2005 14:44:55 +0100 (BST)
From   : Michael McConnell <soruk@...>
Subject: Re: Flippy Discs

On Sun, 16 Oct 2005, Ian Wolstenholme wrote:

> I've found one and you can see it here:
> 
> www.BeebMaster.co.uk/Downloads/Flippy1.jpg
> www.BeebMaster.co.uk/Downloads/Flippy2.jpg
> 
> but I must have remembered it wrongly as there is only one
> write-protect notch.
> 
> The curious thing is that it doesn't actually seem to work if you turn
> the disc over, all that happens is Disc fault 18, although the 
> underneath side can be read in the nornal way using *DRIVE 2.
> 
> I've tried it in a couple of 40/80 track DS drives so maybe they were 
> intended for 40T SS drives.

I used to use these flippy discs on the BBC Masters we had at my old school 
(back in 1988!). Quite curiously, on all the drives we had (Pace, I believe) 
I could use one side on Drive 0 and Drive 2, then flip the disc and had a 
different set of Drive 0 and Drive 2 that I could use without obliterating 
the first pair. Even odder, this worked (quite reliably and portably between 
all the drives) even in 80-track mode.

-- Michael "Soruk" McConnell
   Eridani Star System

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