hmmm, termpwr is a 5volt feed to drive active terminators, or a drives own self termination. there is usualy another jumpter to say "self termination on/off" as well.
for an external/internal _active_ terminator to work, it will need this power feed to operate. active terminators 99% of the time have a little light on them to show that they have power and are working.
passive terminators don't need this power feed as they are really just a bank of resitors pulled down to GND to stop cable reflections.
active terminators need power to provide a differential voltage to the signals (including noise) recieved on the data lines, effectivly cancelling them out. leading to a much cleaner signal path.
you won't blow anything up by having multiple devices supplying term power, but for the sake of a stable +5V feed, see if you can just have one device supplying this voltage. most of the time this will be the scsi controller itself, so you shouldn't have to worry about it, just which drives you have termination enabled on or not.
in the case of the squirrel, i have no idea. last time i played with one was about 1994/5. i don't see why not, but then it may not have one in order to minimize the power draw off of the pcmcia slot.
so really, its just a going to be a case of trial and error. you won't blow anything up, but with scsi, its going to require a bit of fiddling...
if you are going external, the best bet is to use Sun Microsystems Unipack scsi boxes
ebay link to a 36Gb drive in an external boxthey present a 68Pin external connection, so you are going to have a little fun finding adapters going from the squirrel's 50pin centronics hook up, but the boxes themselves use intellegent active termination. they will self terminate both the high and low, or terminate only the high data lines depending on what they have connected.
i have in my scsi chain:-
ID0 4Gb drive (low) terminated
50pin internal
ID7 A500-GVP A530
25pin-50pin cable
ID6 CDRW
50pin-68pin cable
ID4 72Gb SCA drive in a sun box. auto high terminated.
68pin-68pin cable
ID3 72Gb SCA drive in a sun box auto unterminated
68pin-68pin cable
ID2 72Gb SCA drive in a sun box auto unterminated
68pin-68pin cable
ID5 DDS3 Tape Drive in a sun box. auto high terminated.
68pin-50pin cable
ID1 A1200 BlizzPPC (low) terminated
if i have the A1200 switched off, the box with the DDS3 drive in it will detect there is no further device, and auto low terminate aswell. saves a real termination headache, as i can pretty much (bar the CDRW which needs the A500 on to terminate the low data lines) only have turned on what i want to use at any time and the termination takes care of itself...
sorry for the ramble, i havn't much on this afternoon :-D
