It's serial debugging day!

[thalia@discuss.systems]

It'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.

#retrocomputing #vintagecomputing

[elb@social.sdf.org]

@thalia uh are they multiplying

[thalia@discuss.systems]

@elb This is what happens when there's teletypes going cheaply in estate sales . I also recently snagged a cheap barn find Silent 700 707, but I've got no cables for it nor a modem. That's a later project.

[me_@sueden.social]

@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...