resistor packs for terminating SCSI bus inside Exabyte 8020

Nigel Johnson nw.johnson at
Sat Feb 6 18:33:24 CST 2021

Thanks for that. Pity the people who post on ebay don't give close-ups
of the resistor arrays!

My serial is 530573 so it should be a later rev that will work with the
cleaning cartridge.

I have some 4608X-104-221/331L currently in my digikey shopping basket -
I will place order on Monday after I confirm that the two outside pins
go to Vcc and Fss and the six others go to signal pins on the bus.

External not an option really - tight fit inside rack and more parts to
buy than three resistor packs!

Now off to browse ebay pictures :-)

Thanks again, Nigel

Amateur Radio, the origin of the open-source concept!
Skype:  TILBURY2591 nw.johnson at

On 2021-02-06 7:23 p.m., Glen Slick via cctalk wrote:
> On Sat, Feb 6, 2021 at 3:59 PM Nigel Johnson via cctalk
> <cctalk at> wrote:
>> I stand corrected, my 8200 has 3x 8-pin sip sockets!
>> Nigel
> OK, that matches my two EXB-8200 that I just looked at, and also these
> images from eBay listings:
> The first image above shows (3x) 8-pin SIP parts installed, which
> appear visually similar to the parts that are installed in the second
> EXB-8200 I have. I don't recognize the part number. It appears to be
> something like "WT04 9020", where "WT" could possibly be Walsin
> Technology. I can find some datasheets for Walsin Technology WT04
> surface mount resistor arrays, but not SIP parts. Maybe the "9020" is
> a date code, and these are obsolete parts from that vendor and
> datasheets are no longer available, or at least not easy to find.
> In any case, current Bourns 4608X-104-221/331L / 4608X-104-221/331LF
> or 4308R-104-221/331L parts might do the trick. (Or just cable it up
> for external termination).

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