Date   : Wed, 24 Dec 1997 22:19:08 GMT
From   : Mike Mallett <mike.mallett@...>
Subject: BBC Hard discs

>>1mhz bus connects to an interface board (can't see this easily)

>Acorn 1Mhz bus to simple SASI adapter

>>Board connects to another board marked Adaptec ACB 4000 (SCUSI ?)

>Adaptec SASI to MFM converter (has a cpu, rom, ram of its own)

>>This connects to drive : NEC D5146H

>40 Mb, 615 cyls, 8 hds, 17 spt, precomp 128

>Interestingly, this drive is RLL capable, so it becomes a 62Mb unit with
a suitable controller. (no, the Adaptec card won't do it)

-- 
>Mike Tomlinson

This explains a few points !

I was confused about the drive - some people have told me it was
MFM and others said RLL.

If you are saying the controller is MFM I could attach any MFM drive ?

I have another smaller drive (not to hand so I can't find the spec) 
which I can swap
with the above drive. Would it be possible to run BOTH drives off the 
same controller ?

My main drive is partitioned to run ADFS and DOS-Plus (for the 512  
80186 board).
I also have a Z-80 co-pro but so far I have been told it is not possible to run
CP/M from the hard disc.

-- 
Mike Mallett                mike.mallett@...               Reading, UK