Date   : Wed, 24 Nov 2010 11:48:02 +1100
From   : awilliams@... (Alan Williams)
Subject: Harddisc fakery using a microcontroller

> 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 had never realised it was a deficient implementation. It certainly was
fussy, I could never make it work with the SyQuest 20Meg removable media
drives.

There are a number of issues with the host adaptor.  Pin one is usually
marked wrongly, and the pin opposite term power is usually grounded.
These two things when combined usually smoke up your drive's term power
diode.

Alan