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Questions tagged [serial]

for questions on serial ports and cables

7
votes
1answer
152 views

Connecting Panasonic “Penwriter” RK-P400C to modern PC using USB to serial cable

I have a Panasonic "Penwriter" model RK-P400C electronic typewriter/plotter from circa 1985 I'd like to be able to connect to a modern PC. And hopefully even use to draw graphics! Bought in almost new ...
3
votes
2answers
202 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 ...
3
votes
3answers
150 views

What trial-and-error method to use for determining serial terminal settings (RAC2-8-EK)

I have an old device that I am sure works on either 1200,2400,4800 or 9600 bauds (actual setting is controlled by physical switches that I don't have access to) What's the most efficient method (...
5
votes
3answers
201 views

Connect IBM 3481 terminal to RS232?

I recently acquired an IBM 3481 terminal. It has a parallel port, a DB-15 port (I believe for a twinax-T connector), an 8P8C keyboard connector, and a PS/2 connector. Since I don't have a vintage IBM ...
8
votes
1answer
225 views

Reading data over serial from an old punched tape reader

I have an old GNT-4601 punched tape reader/punch that I'm trying to connect to a modern computer. Using the DTE port and a usb-to-serial adapter, I'm able to send data to the punch but I can't read ...
6
votes
6answers
1k views

Transfer files to DOS over serial cable from Linux?

I have a modern Linux computer and a 286 computer running DOS. I would like to transfer files from the Linux computer to the DOS computer over a null modem serial cable. I know you can use INTERLINK....
30
votes
8answers
8k views

Why do articles use the term “UART” instead of “serial port”?

I am learning about old computers, and I have found the following image from this article: They use the terms "UART" instead of "serial port" and "UART driver" instead of "serial port driver", I have ...
0
votes
1answer
183 views

Is this a UART chip? [closed]

Based on my understanding, a UART chip is a chip that exists on a serial card, and it is responsible for the actual sending and receiving of data over the serial port. I want to see what a UART chip ...
6
votes
3answers
438 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
896 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 ...
12
votes
4answers
424 views

How was parity used with modems?

On the back of this question which talks about 5 and 6 bit communications, I remember back in the BBS days that it was common to set your terminal to 8N1, (a.k.a. 8 bits, no parity, 1 stop bit) to ...
26
votes
10answers
2k views

What were the applications of 5/6-bit serial port formats?

Traditional PC serial ports, based on members of the 8250/16550 UART families (or their clones within SuperIO chips) support some unusual serial data formats, specifically 5- and 6-bit data, and 1.5 ...
16
votes
2answers
254 views

Connecting an Apple //e with a Super Serial Card to an Android device via a USB to DB25 cable

I have an Apple //e, and I quite enjoy using it as a dumb terminal to my Raspberry Pi from time to time. Recently, I came across a few cords that could connect my Android phone (a Pixel) to the DB25 ...
6
votes
4answers
326 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 ...
7
votes
3answers
195 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? ...