Thalia ArchibaldIt's serial debugging day!
I need to get at least one of these teletypes working over RS-232 with UNIX V4 and V7 in SIMH. The SIMH docs are notoriously bad. Help would be appreciated.
Michael Engel@thalia Are the teletypes really RS-232 devices or are they using a 20mA current loop interface (https://en.wikipedia.org/wiki/Digital_current_loop_interface), which AFAIK was pretty common for at least some models or teletypes? I don't have much experience with current loop interfaces except for MIDI, though...
@me_ All of my teleprinters use RS-232 over DB-25 and can communicate with my Raspberry Pi using `screen`, to some extent. My 703 works most reliably. My 43s have various issues, but still appear to be RS-232.
There were several variations of the 43. Teletype Model 43 KSR AAC and AAD use RS-232C (see https://bitsavers.org/communications/teletype/43/368_43_Teleprinter_Installation_and_Routine_Servicing_Basic_KSR_Terminals_Mar78.pdf, page 7). I think parts were swapped in mine, so I'm not sure which sub-model numbers I have, but they all have DB-25 connectors, which, from what I've seen, indicates RS-232 (as opposed to modem use).