[TUHS] DEC RL01/RL02 RX01/RX02 Disk Image Creator

Paul Riley paul at rileyriot.com
Tue Jun 2 14:57:54 AEST 2020

Thanks Ron, and all others.

Theres plenty of grist for the mill, time for me to grind it.


*Paul Riley*

Mo: +86 186 8227 8332
Email: paul at rileyriot.com

On Tue, 2 Jun 2020 at 07:59, Ronald Natalie <ron at 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.
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