[TUHS] DEC RL01/RL02 RX01/RX02 Disk Image Creator
clemc at ccc.com
Wed Jun 3 04:08:36 AEST 2020
On Tue, Jun 2, 2020 at 11:44 AM Ronald Natalie <ron at ronnatalie.com> wrote:
> Except on the RX’s. The RX01 was 128 byte sectors and the later ones 256
> and a odd interleaving strategy. However, the boot block and the rest of
> the file systems (both UNIX and RT at least) just aggregated the smaller
> (logical) sectors together to make a 512 byte one.
Indeed, I was less than precise -- the key is that the SW treats them
everything as being in 512 byte 'hunks' no matter the underlying physical
formatting/interleaving actually is.
The point is that if you Paul is trying to move data from the two systems,
just treat the device as a serial byte stream of 512 byte blocks on both
sides and you you be fine. That means if using dd, add conv=sync to fill
any write buffer to a complete multiple of 512.
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