resistor packs for terminating SCSI bus inside Exabyte 8020

[Nigel Johnson]

I stand corrected, my 8200 has 3x 8-pin sip sockets!

Nigel


Nigel Johnson, MSc., MIEEE, MCSE VE3ID/G4AJQ/VA3MCU
Amateur Radio, the origin of the open-source concept!
Skype:  TILBURY2591 nw.johnson at ieee.org



On 2021-02-06 5:48 p.m., Glen Slick via cctalk wrote:
> 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