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Questions tagged [rs232]

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

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Early programmable calculators with RS-232

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 ...
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3answers
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Parallel to serial conversion

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 ...
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Did terminals (e.g. VT100) require a terminal driver on the host computer?

I'm wondering if terminals (like, e.g. the VT100) required the installation of a driver on the host system in order to work with that host? I looked at the documentation of the VT102, and there is ...
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2answers
241 views

Basic test for a RS232 serial terminal

I have a serial terminal that is not working. It's a VT525 using an external monitor (of course) and PS/2 PC keyboard. The self-test passes fine; setup works fine. I can echo characters when local ...
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4answers
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Cartridge modems - was the Vic-20 a special case?

'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 ...
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3answers
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Serial Receipt Printer Garbage

I connected a vintage serial matrix receipt printer (datamega DPN-233) via FTDI to my macbooks usb. It performs its own Selftest without problems, prints an example and the RS 232 configuration (19200....
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3answers
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9-pin port for both RS-232 and Atari joystick?

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 ...
10
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1answer
281 views

RS232 Tape Recorder Emulator?

I need to interface between an older system that uses an RS232 port for reading/writing to a tape and a more modern computer that can manipulate the data and send it back. Is there a software+hardware ...
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2answers
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DECNet physical connector

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 ...
7
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4answers
413 views

Hercules to COM<->USB adapter - is it possible?

I have a 486 (also another 286 mainboard) with a Hercules card, the plug is the same as RS-232. Is it possible to connect the output with serial port USB adapter and simulate Hercules-compatible ...
11
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2answers
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Creating a 'bridge' between a serial port and a Telnet session in Windows 98?

I maintain an older Pentium III running Windows 98 as part of my collection of vintage machines. I named the box "Bridgette" because it basically is used to bridge my older machines into the modern ...
8
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Examples of usage of secondary channel on 25-pin RS232 serial port

The RS-232 standard allows a secondary channel on a 25-pin connector. Are there any examples where this secondary channel is actually used, in computers resp. devices connected via the serial port? ...
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Does the 25-pin IBM PS/1 serial port connector contain two serial ports?

I got my hands on an IBM PS/1 computer and it provides a 25-pin serial port connector. Whith the help of an adapter I can get a 9-pin serial port on COM1 and transfer data that way. I would like to ...
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3answers
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How do serial (user port) adapters achieve speeds above 1200bps in C64?

The information I have states that the userport' serial speed is about 1200bps, but there are some carts going up to 9600bps. I would imagine that the 1200 is the limit, so I'm wondering how is the ...