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For questions regarding the RS232 serial interface standard - its control and usage.

8
votes
4answers
Two very common connectors used in the eighties were the Centronics parallel port (particularly used for printers) and the RS-232 serial port (particularly used for mice and modems). Suppose you have …
asked Jan 23 '19 by rwallace
5
votes
3answers
A 9-pin RS-232 serial port looks superficially quite similar to the Atari joystick port. I don't suppose you could just plug a joystick into a serial port and have it work, but suppose you took this i …
asked Apr 24 '17 by rwallace
6
votes
2answers
DECNet was a network system for DEC computers, introduced in the mid to late seventies. What physical connector did it use? Was it possible to connect to such a network using just an RS-232 serial por …
asked Jan 28 '17 by rwallace
14
votes
5answers
According to https://en.wikipedia.org/wiki/VT52 Like other early DEC terminals, the VT50 series were equipped with both an RS-232 port as well as a 20mA current loop, an older serial standard used wi …
asked Feb 4 by rwallace
6
votes
4answers
'The Home Computer Wars' has this to say about the development of the cartridge modem for the Vic-20: The size of the case was another problem. Most modems came in bulky rectangular boxes about 10 …
asked Aug 18 '18 by rwallace
9
votes
4answers
In the early seventies, companies like HP and Wang sold 'programmable desktop calculators' that were really personal computers in the time before what is usually thought of as the dawn of personal com …
asked Apr 1 '19 by rwallace