Date   : Wed, 24 Nov 2010 00:17:23 +0000
From   : mark@... (Mark Usher)
Subject: Harddisc fakery using a microcontroller

Egg... Face :-) sorry, been a very very long day today, and an even longer
one tomorrow. I'm even top posting too!

People had always surmised since the 90s that the host adapter board doesn't
work directly with a scsi drive due to lack of ATN implementation. Yet here
we are with the very board working quite happily with a scsi drive.

I don't think though the circuit diagram for the host adapter is included
in the filestore service manual.

///M



On 23 Nov 2010,@23:25, Pete Turnbull <pete@...> wrote:

> Mark Usher wrote:
> 
>> Actually yes. I have the physical E20 opened up and sat in front of me. It
>> is also definitely an E20 as it has the MHz bus connectors on the back and
>> not SCSI as with the E20s.
> 
> LOL!  You just wasted a lot of typing, because you didn't read what I 
> wrote very carefully.  I was pointing out that the host adapter does not 
> support ATN, and in fact is the same as the one in the Beeb winchester:
> 
>>> Perhaps the host adapter is slightly different to the Beeb one and
>>> ATN has actually been implemented!
>>> 
>>> Sadly not.  The Filestore circuit diagrams and service manuals make
>>> that clear.
> 
> In fact you clearly didn't read some of it at all, as most of my post 
> was actually pointing out that the E20 (not just the E20S) has no 
> Adaptec ACB4000.  Never mind "Look at the Filestore service manual more 
> carefully." -- perhaps /you/ should read what is written before you 
> reply :-)
> 
> -- 
> Pete                                              Peter Turnbull
>                                           Network Manager
>                                           University of York
> 
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