6 Feb
2021
6 Feb
'21
2:48 p.m.
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