At 15:25 -0800 12/12/05, Scott Baret wrote:
> My SE/30 "server" sits on a Mac II case with nomotherboard. Inside
> there are four SCSI disks which use the MacII power supply and tie to
> the external SCSI port on the SE/30.
I am curious as to how this huge external disk would work. I have a
ton of old hard drives that don't have Macs to go wtih, so I may
make something like this. Are they all wired together inside using
SCSI cables?
One SCSI cable, 50 conductor ribbon wire, with pressed-on 50 pin
"internal" SCSIc connectors. One 50 pin "external" blue ribbon
connector to use with a "standard" Apple SCSI cable from the SE/30.
The last disk in the row has its terminators enabled and, of course,
they all have different SCSI id's.
Is the Mac II modified so that there is a bunch of SCSI ports
sticking out the back?
Just one; and actually it's just the ribbon cable passing through a
hole once used for a NuBus card. I'm sure it flunks the US FCC class
B test.
The Mac II power supply needs a 5 volt pulse on one of its pins to
start up so I have a push button switch and the equivalent of a PRAM
battery (AA cells) in the box for that. I plug the SE/30 into what
was the monitor connector on the power supply so that during a power
failure the whole system shuts down and doesn't come back up until a
human - me - decides that power is again stable.
Alternately I have a 20SC case with a dead 5.25" drive inside so I
guess I could stick two 3.5" drives in
there.
You do have to worry about the capability of the power supply. Newer
disks use less power. Make sure they don't get too hot but hot is
pretty normal for older disks.
For system 7 you can also worry about the size of allocation blocks
on disk partitions. Above a GB you probably want to set up partitions
to avoid a whole lot of wasted space.
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