resistor packs for terminating SCSI bus inside Exabyte 8020

[Glen Slick]

On Sat, Feb 6, 2021 at 1:26 PM Nigel Johnson via cctalk
<cctalk at classiccmp.org> wrote:
>
> Hi all, I wonder if anybody has one with the terminators installed that
> can read off the p/n for these SIPs
>
> The manual says they are 8-pin 7 resistor 220/330 ones, but that is not
> possible! To put 7 resistor pairs to 220 and 330 you need a 9-pin,
> unless you have one resistor SIP for 220 and another for 330!  But there
> are 2 so that leaves an odd number! The sockets are 9-pin.  I have yet
> to find any 9-pin ones on digikey
>

I just took a look at one of my EXB-8200 tape drives. Unfortunately it
wasn't set up for internal termination and the resistor packs were
removed. It has (3x) 8-pin SIP sockets.

Bourns 4608X-104-221/331L / 4608X-104-221/331LF and 4308R-104-221/331L
parts are in stock at Mouser and Digi-Key. Those are 8-pin,
12-resistor dual termination networks.

(3x) 4608X-104-221/331 parts would have the necessary number for
terminations for single-ended SCSI:

https://www.bourns.com/pdfs/scsi.pdf