[cctalk] Re: RS232 - parallel modems!?

[Jon Elson via cctalk]

On 2/15/25 22:11, Steve Lewis via cctalk wrote:

Had an interesting talk with Usagi today around his LGP-21 (yes from 1963),
debating whether the ASR-33 was RS-232 or not.  He thinks not all ASR-33
were current-loop, but whether they were adapted after the fact, we're not
sure (there was also KSR-33 and RO-devices).

I believe there was an optional RS-232 to current loop 
converter board that could be supplied by Teletype so the 
ASR33 could be used with a standard RS-232 modem for dial-up 
use.  It was a fairly small card about the size of a credit 
card IIRC.

Jon