12.018 How do I modify my Apple Computer High-Speed or Rev C SCSI card to supply Termination Power?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
12.018 How do I modify my Apple Computer High-Speed or Rev C SCSI card to supply Termination Power?
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.
By: Harold Hislop, Dan Brown, Rubywand
Related FAQs Resources: R009SCSIMOD.GIF (GIF pic)
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