[rescue] upgrading VAXstation memory

der Mouse mouse at Rodents-Montreal.ORG
Tue Apr 20 14:17:05 CDT 2010

> they're electrically compatible; there are - or were - adapters to
> put sca drives into older equipt, and maybe the other way too.

I've never seen "the other way", but can't see any reason it couldn't
be done in theory.  Most boxen with SCA bays, though, don't have a lot
of physical space to tuck an adapter in, at least not in my (admittedly
limited) experience.  I've got a few adapters for putting SCA disks on
various other types of connectors (2x25 .1" header, 50-pin
high-density, and 68-pin high-density are the ones I remember).

> i assume it isn't high-voltage differential.  most more recent drives
> are low-voltage differential, which can fall back to single-ended
> operation.  hvd is only compatible with hvd, and it's getting hard to
> find.

While it's not much help for a VAXstation, I have more SBus HVD SCSI
cards than I'm ever going to need, so if you have HVD peripherals you
want to connect and an SBus machine available, I can fix you up with a
card easily enough.

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