Date   : Sun, 18 Jan 1998 18:16:32 +0000
From   : Andrew de Quincey <adq@...>
Subject: Re: ADFS Format

> As I remember when experimenting with this, you need a single 
> density controller in order to read BBC DFS 40 & 80 track disks. 

> I have an AT controller which reads BBC discs fine.  The readme file
> which comes with a disc utility program called FDC states that the
> floppy controller needs two crystals, a 16Mhz and a 9.6Mhz, in order 
> to be able to read single density.  Mine has this and can read BBC 
> discs fine, whereas the units which have one 24Mhz crystal I have 
> been unable to get to work.

The fix I have involved desoldering the FDC's SD pin, sticking it through 
a NOT gate, and soldering it onto another chip.. maybe this is an 
alternative solution

Anyway, I'm getting one of the catweasel cards; I have loads of ancient
legacy disks..