2 Jun
2020
2 Jun
'20
10:57 a.m.
Thanks Ron, and all others.
Theres plenty of grist for the mill, time for me to grind it.
Paul
*Paul Riley*
Mo: +86 186 8227 8332
Email: paul(a)rileyriot.com
On Tue, 2 Jun 2020 at 07:59, Ronald Natalie <ron(a)ronnatalie.com> wrote:
As far as the early UNIXs go, any disk is collection
of 512-byte blocks.
The filesystems either the early (what I’ll call V6) and the later (V7)
don’t differ much.
The primary difference is that the later V7 had 16-bit uids and a
provision for larger file systems/sizes. The V6 file system was limited
to 2^24 blocks while V7
did 2^32.
The 512 block size corresponded to the native sector size of all the DEC
hardware except the RX which I think only had 128-byte sectors. But
again, we didn’t
do much with that other than write the standalone console disks for the
780 (in RT format) and I also used it to make “unix” file system disks for
the BRL “LOS”
(little operating system…no time for sharing, uniprocessor system) that
ran our internet routers and the IO hardware on the HEP supercomputer.