Re: SCSI Termination Power

[Wayne Stewart <waynes@intergate.bc.ca>]

John E. Townsend wrote:

> OK, I finally got ahold of the HS SCSI utils disk for the IIe.
> Unfortunately it turned out to be pretty worthless, but I was able to do
> what I needed by cannibalizing the RamFAST out of my IIgs temporarily.
> Now I have another problem. :-)  The drive I want to use on the IIe (a
> 1988 vintage 40MB 3.5" Quantum mechanism that I took out of a Mac SE/30)
> doesn't seem to be providing SCSI termination power.  I figured this out
> after the drive would work on the RamFAST but not the HS SCSI card
> unless I added another device to the chain.  Since I really only want
> the Quantum drive on this machine, how can I get it to provide its own
> termination power?  There is a jumper block inside it with three pairs
> of contacts labeled SS, EP, and WS, and currently only the EP contacts
> are closed.  If necessary, I'm not afraid of using a soldering iron
> either. :-)
>
>     -- John Townsend

To supply termination power you need to make a modification to the
Apple HS card. Can't help you on the specifics since I've never needed
to make that modification.

The 3 sets of jumper blockd are

SS - Self-seek - normally off
EP- Enable Parity - normally on
WS-Wait/Spin disable - normally off
later  model drives usually have one called TE for termination, usefull
if you need an internally terminated drive


     Wayne