8 Dec
2015
8 Dec
'15
11:34 a.m.
On Tue, Dec 8, 2015 at 11:02 AM, Paul Koning <paulkoning at comcast.net> wrote:
One detail on "it doesn't care what the tape
is": RSTS kits on 1/2 inch tape come
in 800 and 1600 bpi versions. They have different boot blocks, each of them
designed to work with all tape drives/controllers supported on RSTS that
support the density in question. For example, the 1600 bpi kit doesn't boot
on a TM11 controller, and the 800 bpi kit won't boot on a TMSCP controller.
I remember TM and TS boot issues from the 80s when we were running RSTS
on an assortment of 11/24 and 11/34 hardware and having to migrate tape
controllers and tape drives from place to place for the installs (TMB11 + TS03,
MS11 + TU80...) I still have a couple of boxes of 800bpi small reels we used
on that TS03.
This matters if you try to boot one in an emulator
where physical tape density doens't have any meaning.
Hadn't considered the implications, but sure... you would have to completely
emulate the original gear or the stars won't align.
-ethan