[vcf-midatlantic] Bernoulli Drives needed in working condition

Dave McGuire mcguire at neurotica.com
Tue May 18 15:06:04 UTC 2021

On 5/18/21 10:57 AM, Ethan O'Toole via vcf-midatlantic wrote:
> There are a number of Bernoulli cards on feeBay. I remember the drives,
> but when I used them they were 44mb and SCSI as I recall.
> https://www.ebay.com/itm/124405462633
> Looks like a DB-37 cable is used as well.
> Also, some of the boards on eBay have an EPROM (boot?), some don't. Some
> are missing a bunch of chips including what might be a pal/gal.
> Lots of different versions but most seem to have DB-37.

  Those are the earlier ones, 8" disks 10MB and 20MB.  Looking at that
board on eBay the memories are starting to come back. ;)  There are a
few different interfaces; the one you referenced above is the better
one, with some buffering.  Any of them should work I think.  I remember
that I used several different models on the 8" drives over the years.

  Incidentally, I currently use a pair of 44MB SCSI Bernoulli drives on
my personal PDP-11/34 (here at home, not at LSSM) interfaced via a
Unibus SCSI host adapter.  I run RT-11, RSTS/E, and RSX-11M that way.
Works a treat, and it's very handy for healing the soul when something
stresses me out.


Dave McGuire, AK4HZ
New Kensington, PA

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