1 Dec
2011
1 Dec
'11
3:02 p.m.
SCSI drives are rare? I have a bunch. Came out of
old Compaq servers. What am I bid?
I got 9gb, 18gb, maybe a few 36gb, maybe some 2gb
and 4gb. I'd have to poke about.
I thought these things were common as dirt.
At 02:21 PM 12/1/2011, you wrote:
On Dec 1, 2011, at 2:55 PM, Philip Pemberton wrote:
591 . [Science] This book fills a much-needed
gap. --Moses Hadas when he was asked to say
something nice about a fellow scientist's new book.
NEW: a50mhzham at gmail.com ? N9QQB (amateur radio)
"HEY YOU" (loud shouting) ? Second Tops (Set Dancing) ? FIND ME ON FACEBOOK
43? 7' 17.2" N by 88? 6' 28.9" W ? Elevation 815' ? Grid Square
EN53wc
LAN/Telecom Analyst ? Open-source Dude ? Musician
? Registered Linux User 385531
On 01/12/11 04:03, Tom wrote:
curiosity... maybe it's time for another
product...
At 07:47 PM 11/30/2011, you wrote:
All this talk of SCSI has piqued my m88k Systems use standard SCSI and can use
anything up to 2GB without a
problem. I have DG/UX 5.?? on CD and 4.?? on Tape here.
As far as I know, the one we have uses standard SCSI (as opposed to
what? Diff?) as well.
Would anyone be interested in a device with
the footprint of a 3.5in hard disk
drive, which
allowed SD or CompactFlash cards to be connected to a SCSI bus?
Perhaps even with the option of emulating
SCSI CD-ROM drives (including those pesky
512-byte block drives), or even multiple
devices at a time ("this partition contains a
CD image and is SCSI dev 5, this one is a 1GB
hard drive on dev 4, and this is a 100MB read-only HDD on dev 6").
Obviously device IDs would be fully
configurable (so you could make it pretend to
be a Quantum Bigfoot or Seagate Cheetah if you
needed to). Multi-LUN and Multi-Device might
have to be (low cost) pay-for options, though...
I'd be interested in it as well as interested in
developing such a device; I was thinking about
it just yesterday because of my dwindling stash
of real SCSI hard drives, all of which are pretty noisy.
My primary "catch" with all this is the I/O, as
usual; real 5v SCSI transceivers are getting
hard (and expensive) to come by, and the drive
requirements are 48mA, if I recall, which is a
tall order for a lot of translation
devices. Some of the signals are
open-collector, if recollection serves, but
quite a few are actively driven. Not impossible, certainly.
I come at it from an FPGA perspective, so
something to bridge <=3.3v to 5v is necessary. I
would advise against what they recommended on
the vintage-computer forum, which is to use NOS
or salvaged 5380, 53c90, 53c94, etc. chips;
those are getting hard to find in any quantity without resorting to scrappers.
Short answer: I'm interested in developing my
own solution with an FPGA and a small micro
doing housekeeping and/or transaction-level
logic. If you're interested in a collaboration,
I'm interested; otherwise, I'm going to make one
of my own soon because my disks are all dying.
- Dave