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How do I modify my Apple Computer High-Speed or Rev C SCSI card to supply Termination Power?

April 26, 2017apple computer card High-Speed power rev SCSI supply termination

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How do I modify my Apple Computer High-Speed or Rev C SCSI card to supply Termination Power?

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The Termination Power modification for Apple SCSI cards consists of adding a diode. The mod for each card is shown in resource file R009SCSIMOD.GIF. The High-Speed card pic shows a simple sketch of the back of the Apple High Speed SCSI card near connectors 26-33. The directions say that you connect a 1N914 diode between two points: The anode (non-banded end) of the diode goes to the top of L1. The cathode (banded/striped end) of the diode goes to the >bottom< of RP2 The pic shows the top of L1 to be a solder pad (just a solder pad with no trace showing) a little ways up from a point between connectors 32 and 33. The >bottom< of RP2 is just a bit up and to the left of the top of L1. It is the lowest of several points (the pic shows 8) arranged in a vertical column and should have a trace going off to the left. The other pic shows where to connect the diode on an Apple Rev C SCSI card.