Date   : Sun, 26 Apr 2009 22:07:53 +0100
From   : robert@... (Rob)
Subject: ADFS Drive Numbers

2009/4/26 Ian Wolstenholme <bbcmailinglist@...>:

>
> If I were to happen to connect up two separate Winchester units, daisy
> chaining them together (eg. to make a backup of the Technomatic!!)
> what would I need to do to the drive and controller IDs? ?I just had two
> Winchesters on the Technomatic Adaptec controller, both set to 0 and
> that gave some very funny results! It worked OK with one drive as 0 and
> the other as 1, but I don't know what would happen if I put another
> Adaptec controller on the 1MHz bus, since changing the Technomatic's
> Adaptec ID doesn't seem to let me access it.
>

Some other docs on the net seem to indicate that 4 hard drives are
supported. One controller card (and associated 1MHz bus->SASI
interface) per two drives.  Controller 1 at address FC40, drives 0 & 1
are hard drives 0 & 1, controller 2 at address FD44, drives 0 and 1
are hard drives 2 & 3.  So for three or four drives you need two
complete setups, daisychained on the 1MHz bus, with the address on the
1MHz bus->SASI adapter changed on one of them, and remembering to
disable any termination on all but the last device.

I don't know what controller card is in the Technomatic, but if it's
the same adaptec as on the Acorn machines, you'll have a 34 way cable
and a 20 way cable from the adaptec to the hard drive.  To connect a
second drive within the box, you'll need a 34 way cable with two
headers on it, as both drives are connected in parallel on that cable,
and an additional 20 way cable that connects to a second socket on the
adaptec..

HTH

Rob