Date   : Fri, 12 Jan 2007 07:33:25 -0600
From   : julesrichardsonuk@... (Jules Richardson)
Subject: ADFS and DFS in a beeb

Andrew Benham wrote:
> Jules Richardson wrote:
> 
>> Can both ADFS and DFS ROMs exist in a BBC micro, with the user selecting 
>> between them?
> 
> Yes, no problem - apart from PAGE being something like &1F00 as I recall.
> 
> *DISK and *ADFS to switch between them.

Thanks to everyone (lots of off-list replies too!).

Next question: apparently an 8271 *won't* work, which unfortunately is what's 
in the 'desktop' beeb...

What about a 1772? That's what the "nearest" other beeb has - it's a 28 pin 
chip on a small adapter board along with three LS logic chips, plugged into 
the normal FDC socket on the beeb. Is it 1770-compatible?

I seem to be rather flush with 8271's - found around ten of them in a box of 
unknown provenance - but the only 1770's are apparently tucked away inside 
machines.

The other obvious question is whether Watford's DFS is compatible with the 
1770 chip? (or the 1772)

cheers

Jules