Two very common connectors used in the eighties were the Centronics parallel port particularly used for printers and the RS serial port particularly used for mice and modems. Suppose you have a computer with one kind of port and a peripheral with another particularly, a computer that talks RS and a printer that talks Centronics. A widget simpler than a full-blown computer, I mean. It seems to me that the parallel to serial translation would need some kind of shift register.
I'm not so sure about the voltage issue. Is there a way to translate between those? This can be done with a UART such as the Here's an example that converts serial to parallel Schematics of a Printer Adaptor.
Unlike more modern UARTs the does not have any internal registers that need to be 'programmed' to set it up, so it can be used standalone - and it has separate parallel read and write ports which are easier to use in a 'dumb' hardwired circuit. Serial to Parallel Printer Interface. The attached picture shows a Miracle Serial to parallel converter for the Sinclair QL, courtesy of The QL had no ex-factory Centronics printer interface, and solutions that blocked the expansion port for connecting a printer only were not really what customers wanted, so the Centronics Interface was a cash-cow for Miracle Systems for years.
Inside, there's a small PIC16C54 MCU ex-General Instruments, now Microchip that does the serial-to-parallel conversion and feeds off the signal lines so it doesn't need an extra power supply.
Here is a picture that has a detail view of the innards of a slightly different version. This is only barely Retrocomputing. But ports for PCs are still available and as noted below, the companies I dealt with years ago for converters still sell them.
But there aren't so many printers these days with serial or parallel ports now that M or even 1G network ports for printers are dirt cheap, so we'll call it Retro. For example, Okidata Microline printers would typically come standard with a parallel port but you could add a serial port card I probably still have one around here somewhere.
In more recent years I think they even had a network card that used the same interface slot, though I never bothered with that myself. With PC-compatibles this is trivial, but with other machines not always so easy. Plus there are situations e. Plus end-to-end serial has big advantages over parallel - feet without any problem at all. Voltage is, I think, the least of the conversion issues.
The big factor is handshaking. Over the years, I found that parallel handshaking was very reliable but serial Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
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Some receivers require additional drivers installed within the operating system while others do not. Know what type of device you have before you start shopping for one that will work with your serial port. A terminal program allows you to communicate via serial port by typing and downloading data from your port. There are several free and paid-for programs available online and in store shelves today that provide this functionality.
A printer communicates with your computer via its serial port. Printers are very easy to find on eBay and other online retailers; all you need to know is the model number to search for it. The serial port was once found on practically all new PCs, however it is no more. As a result, as of , it is becoming, if not already, outdated. Although it is commonly referred to as a "legacy" device, it is still used by some for gear intended to connect to the serial port , particularly for computers used as servers by businesses.
USB Connectivity Universal Serial Bus These can connect practically any device, including mice, keyboards, printers, and digital cameras. They are frequently seen on the front and rear of the computer. USB ports operate at a speed of 1. They can be found on the back of most personal computers as well as some servers and workstations.
Parallel Port Connectivity A standard developed by Apple that remained popular until the introduction of USB connectivity, these ports can be found on the rear of most Apple Macintosh computers. They can also be found on many peripherals designed specifically for use with Macs. Parallel ports operate at a speed of 16 mA per port, with a maximum total current of mA.
The parallel port standard was introduced in and remains in use today. To avoid confusion, the cables that transmit this data other than "the" serial cable and the computer ports into which they plug are frequently given a more particular name. Parallel printer connections and ports include Centronics and Lexmark. A serial connection transmits one bit of data at a time, from transmitter to receiver. Each bit of data is called a "character.
The sender converts each letter to be sent into its corresponding sequence of 0s and 1s; these sequences are called "bytes. A parallel connection sends several bits of data simultaneously. Each "word" of data consists of 8 bits, so parallel interfaces can transfer up to bytes per word.
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