23 Sep
2021
23 Sep
'21
7:22 p.m.
But the sector format is a different matter. If
it's designed for
PDP-11 and friends, presumably it has a 512 byte sector size.
For PDP-10 or -20 use you'd presumably want a
sector size consisting
of some round number of 36 bit words.
576 byte sectors (128 words), IIRC.
The unit of allocation on TOPS-20 was a page (512 words).
I forget what it was on TOPS-10: 256 word blocks?
My notes (from sources unknown) say (of the ML11A):
solid-state (ram) disk; 2MB/s xfer
1-31 arrays of 512 or 2048 blocks ea
using 11/70 MK11 (MOS) memory
looked like RS03/RS04 to s/w
http://gunkies.org/wiki/RS03/04_disk_drive
says about *REAL* RS03/04 drives:
"basic format was 18-bit words
(for use in PDP-10 and PDP-15 machines)"
But I doubt that anyone would care to replicate THAT feature
(throwing away two bits of each word) on a PDP-11 option!