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PS/2 Keyboard Encoder

  • PS/2 Encoder PCB Top View
  • PS/2 Encoder Fully Assembled with Connector
  • PS/2 Encoder Fully Assembled with Connector
1.20 Ounces
Calculated at checkout

Product Description

PS/2 Encoder interfaces industry standard PS/2 PC-compatible keyboards to devices requiring TTL-level RS232 or parallel data signaling.  All ASCII key sequences are decoded, as well as common keyboard sequences like "CTRL-ALT-DEL".  To provide maximum flexibility for various uses while retaining ease of operation, the unit's configuration can be modified in-circuit using the PS/2 keyboard itself.  Features include:

  • Unit outputs ASCII via 8-bit parallel port and RS232
  • Parallel output support configurable active high or active low strobe
  • Output supports variable intercharacter delay (0-2.5s in 10mS increments)
  • RS232 bps rate can be set from 110-57600 bps
  • BS sends either BS or DEL
  • CR sends CR or CRLF
  • Crystal is optional
  • CAPSLock operation works
  • Indicator LEDs are supported
  • Configuration can be performed from the keyboard.  When CONFIG jumper is installed, Ctrl/Alt/BS places the unit into configuration mode, where keypresses set various options.
  • Special "raw mode" sends actual PS/2 keyscan values to the RS232 and parallel ports.

Technical Details

PS/2 Encoder consists of an Atmel ATMEGA88 AVR microcontroller and associated connectors.  The unit can be ordered as a base PCB, a minimal parts kit, a full parts kit, or a completed unit.

The PCB features include:

  • Supports 24 pin .6″ IC socket connection as well as 2×12 header connection.
  • Crystal footprint included on PCB
  • PS/2 connector footprint included on PCB
  • Through hole design makes "do-it-yourself" construction easy.


Construction details and configuration settings are available on the product information page.


  • If you are outside of the United States and your order consists solely of unpopulated PCBs, please contact us for cheaper shipping options.
  • Both kit and assembled units are sourced and (if requested) hand manufactured after orders are placed. We thus typically ship 4-5 weeks after order placement.
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Product Reviews

  1. PS/2 Keyboard Encoder is Outstanding! 5 Star Review

    Posted by on 25th Oct 2019

    This encoder is very easy to use and well documented. I had this up and running in minutes. Also the support staff were amazing. Thank you!

  2. Works well and very useful 5 Star Review

    Posted by on 19th Sep 2019

    I had a need for a couple of ASCII parallel keyboards to use with some vintage and home built computers. I wanted a converter that had some flexibility and also provided a TTL serial output. This board fit the bill on all accounts. I made a couple of simple changes to it to meet my needs. I extended the parallel strobe time to 1ms to make sure it is seen in all cases. I also changed the timing on /int line to use it as a one second reset line for some old 8-bit computers. This has worked out well. I would recommend the board for anyone that has a need to turn a PS/2 keyboard into a vintage keyboard.

  3. Superb product! 5 Star Review

    Posted by on 17th Jul 2018

    I'm in the process of building a couple of Z-80 computers and needed a keyboard input. I was dreading having to take a PC keyboard apart and trace out the key switches to get ASCII out of it. This does parallel AND serial simultaneously and is highly configurable. Thank you for saving many hours of my life!

  4. Does the Job 5 Star Review

    Posted by on 20th Oct 2014

    Very easy to interface with, and easy to use. The instructions for the unit use can be found on an associated product information blog, but it would have been a bit easier if there was a hard copy. It was nice to have the schematics and source code available on their website if I ever wanted to add extra features I could reprogram the ATMEGA. Also, the GNU licence is a plus.

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