SCSI Termination Resistor Packs:

These are SIP (Single Inline Pin) assemblies with internal arrays of resistors used to provide termination on very old SCSI hard drive and on the FWB NuBus JackHammer card.

Insert the resistor packs to enable SCSI termination on the device. Remove the resistor packs to remove SCSI termination from the device.

If the termination resistor packs were removed from your device a long time ago, they can be very difficult to replace. Searches on useful terms like "SCSI Termination Resistor Packs" will turn up very little useful information and it will appear that these useful little SIPs are no long available for purchase anywhere.

However, if you know that an 8 pin (3 required) SCSI termination pack is a Bourns 4308-104-221/331 or 4608-104-221/331 and search on that, you'll find that several electronics supply houses, such as Mouser, Jameco and Questcomp stock them. For the 10 or 11 pin (2 required) SCSI termination pack use Bourns 4311-104-221/331. Or if it's 10 pin then 4310-104-221/331.

I found that at Mouser there are extra letters in the full part number, so a search on 221/331 is more useful.

If you can't find the 43xx then search for the 46xx. The only difference is the package above the pins.

http://www.mouser.com/ProductDetail/Bourns/4610X-104-221-331L/?qs=sGAEpiMZZMvrmc6UYKmaNccpGBHYJbrG99AJVMM%252bfMk%3d

http://www.mouser.com/ProductDetail/Bourns/4608X-104-221-331LF/?qs=sGAEpiMZZMvrmc6UYKmaNdB1hNUXmH4oGn7oAwLmg%252bM%3d

Jameco:

http://www.jameco.com/webapp/wcs/stores/servlet/StoreCatalogDrillDownView?langId=-1&storeId=10001&catalogId=10001&position=1&refineType=1&sub_attr_name=Circuit%20Designator&refineValue=TERM&refine=1&history=eu0ex3tu%7CfreeText~bourns%5Esearch_type~jamecoall%5EprodPage~15%5Epage~SEARCH%252BNAV%40q42xnljl%7Ccategory~205031%5EcategoryName~cat_2050%5Eposition~1%5Erefine~1%5EsubCategoryName~Passive%2BComponents%2B%252F%2BResistors%2B%252F%2BNetwork%252C%2BSIP%5EprodPage~15%5Epage~SEARCH%252BNAV%40vzyb4mar%7Cposition~16%5Erf~1%5Erefine~1%5EprodPage~15%5Epage~SEARCH%252BNAV

http://www.bourns.com/pdfs/scsitermap.pdf

http://www.bourns.com/data/global/pdfs/4300R.pdf

http://www.bourns.com/data/global/pdfs/4600H.pdf

http://www.bourns.com/data/global/pdfs/dutermap.pdf

http://www.bourns.com/data/global/pdfs/bourns_networks_short_form.pdf

http://www.bourns.com/data/global/pdfs/Bourns_N1065_4600_Alternative_FPB.pdf