bernard@prlb23.prlb.philips.be (bernard) (06/14/91)
I 've bought a new internal CDC hard disk for my old Mac II. Very fast,
silent compared to the `old' (1987) 40Mb Quantum I had. I've also got a
box with alimentation to put my old Quantum in it. The box has a scsi
id selector terminated by 2 connectors of 3 wires : the first connector
are the common wires and the second carries the "1", "2" and "4" wires
that will generate scsi identification of 0 to 7.
Well, now the problem : where do I connect these wires to my old
Quantum... The Quantum back side has 2 connectors: a big one which is
the scsi i/o and a small one made of 2 rows of 8 pins. Maybe these are
to be used for scsi id setting ? Can someone send me info on how to use
these pins ?
The back side of my old Quantum 40Mb looks like this:
_________________________________________________________
| HD metal box |
| Q250 76-45004 56 alim conn. |
| V |
| |||| |
=========================================================
......................... ........ ^
......................... ........ circuit board
^ ^
scsi i/o connector other connector
(scsi id setting ??)
On the circuit board, there is also a row of 2 * 8 pins for jumpers.
There are 2 jumpers put in this row. The row is just below a big squared
IC ( OMTI 20508, NCR-0380296...). The part of the board around this row
looks like this:
board
V
_______________________________________________
| ____________________ _____________ |
| | scsi i/o connector || other conn. | |
| -------------------- ------------- |
| |
| |
| ___________ |
| | |
| | OMTI |
| | NCR-... | <- big IC
| | |
| | |
| -----------
|
| ::::|::| <- jumpers receiver pins
| some of them (|) have jumpers
What's the use of these jumpers ?
The CDC 3.5 HD is quite silent. So now, the main source of noise in my old
Mac II is the fan. Are there more silent fans i could use ?
Thanks.
Yves Bernard bernard@prlb.philips.be
Philips Research Lab, Belgium
4 avenue Einstein
1348 Louvain-La-Neuve