Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [rs232]

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

4
votes
3answers
809 views

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 ...
21
votes
8answers
3k views

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 ...
3
votes
2answers
238 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 ...
5
votes
4answers
332 views

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 ...
6
votes
3answers
566 views

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....
5
votes
3answers
1k views

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
votes
1answer
273 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 ...
6
votes
2answers
166 views

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
votes
4answers
396 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
votes
2answers
2k views

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
votes
3answers
216 views

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? ...
8
votes
3answers
647 views

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 ...
11
votes
3answers
1k views

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 ...