>>>> "Allison" == Allison
<ajp166 at bellatlantic.net> writes:
Allison> DDCMP can run over sync or async lines it was commonly done
Allison> async for slow lines and sync for fast lines the division
Allison> was around 19.2kbaud with the sync cards favoring the faster
Allison> than that rates.
True, but async DDCMP wasn't as widely supported. In particular,
until around V10.0, RSTS/E only supported the sync DDCMP cards where
the protocol was implemented on the card -- DMC11 and its successors.
Very late in the history of RSTS I wrote an async DDCMP driver for it,
mainly because that was the only way to get DDCMP on a Pro...
paul