R.I.P: PC hardware related items

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R.I.P: PC hardware related items

Self made UW-SCSI terminators

These are some pictures of the High-Only-UW-SCSI-Terminator, that I built for my Asus P2B-DS board. Because the BIOS doesn't allow to set the termination of the Single-Ended (Ultra-Wide-) SCSI bus segment to High-Only, I had to build such a terminator by myself. The advantage is, that I can disable the SE termination now without interfering the LVD bus segment anymore.

[UW high only terminator,
overview, 65KB]

[UW high only terminator,
front view, 58KB]

After I got one year of stable SCSI operation with this ugly bastard I built some new, more sophisticated terminators for my needs. One of the new terminators is similar to the one above, but it got an additional throughput connector. The other one was built for multi purpose usage, it got terminators for all the lines of the UW-SCSI bus and it's high and low termination can be switched independently, if I need a high only termination in one case and full termination in the other one.

[2nd UW terminator, top view, 51KB]

[2nd UW terminator, bottom view, 52KB]

Currently I don't know, if there will be some more self built terminators in the future, because the next SCSI generation is on it's run. Because the current and future SCSI standards, namely Ultra2-, U160-, U320- and Ultra3-SCSI, need double the lines to be terminated (because each line is differential and needs a pair of wires) it will be very difficult so solder so much lines only with wires and no PCB. Addditionally the termination ICs are much more expensive and the pitch would be half the size (~0.6 mm) of the currently used Dallas DS2107 chips.