AT2XT Keyboard Adapter

A simple adapter to enable the use of a modern PS2 keyboard on IBM XT computers

Dave's Dev Lab

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Description

The original IBM XT computers use a different keyboard interface protocol than modern PS/2 keyboard. This project is partially based on the adapter created by the Vintage Computer Forum.

Files

at2xt-board-reva.zip Eagle CAD Design Files - This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. CC-BY-NC 4.0, Copyright (C) 2019, David Anders. All Rights Reserved. Zip Archive - 58.73 kB - 07/08/2019 at 01:14		Download
at2xt-board-reva-gerbers.zip Gerber Manufacturing Files - This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. CC-BY-NC 4.0, Copyright (C) 2019, David Anders. All Rights Reserved. Zip Archive - 35.93 kB - 07/08/2019 at 01:13		Download
XTATKEY_RT01.ZIP PIC Firmware Source Code and Intel Hex File - Copyright by Charles P. Guzis, all rights reserved. Chuck Guzis retains all rights to this code, but gives permission to use and modify it for non-commercial, non-profit applications, provided that this copyright notice is reproduced in its entirety. Zip Archive - 14.24 kB - 07/08/2019 at 00:45		Download
XTAT094S.ZIP PIC Firmware Source Code - Copyright by Charles P. Guzis, all rights reserved. Chuck Guzis retains all rights to this code, but gives permission to use and modify it for non-commercial, non-profit applications, provided that this copyright notice is reproduced in its entirety. Zip Archive - 12.22 kB - 07/07/2019 at 23:48		Download
XTATKEY_094.HEX Intel Hex PIC Firmware - Copyright by Charles P. Guzis, all rights reserved. Chuck Guzis retains all rights to this code, but gives permission to use and modify it for non-commercial, non-profit applications, provided that this copyright notice is reproduced in its entirety. x-hex - 2.68 kB - 07/07/2019 at 23:27		Download

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Components

1 × 6-PIN DIN Connector http://www.bgmicro.com/ACS2020.aspx
1 × Diode 1N4148 http://www.bgmicro.com/1n4148-pack-of-50.aspx
3 × Resistor - 4.7K Ohm 1/4 Watt http://www.bgmicro.com/RES1147.aspx
1 × 8-PIN DIP Socket http://www.bgmicro.com/soc1036.aspx
1 × MCU PIC12F629 https://www.digikey.com/product-detail/en/microchip-technology/PIC12F629-I-P/PIC12F629-I-P-ND/459169

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Project Logs

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XT-2-PS2 Adapter Assembled!
Dave's Dev Lab • 07/13/2019 at 03:25 • 0 comments

The PCBs arrived today from JLCPCB ! I quickly assembled the board and did some tests. Worked on the first try! The original reference design for this called out 4.7K Ohm resistors which is what i tested with first, however I wanted to see if worked using 10K Ohm resistors as well and it did. I also made the design with large spacing for both the diode and resistors so that you can using 1/8, 1/4 and 1/2 Watt resistors or alternative diodes int he design! After final testing, I mounted the adapter along with the ATX PSU Adapter on a piece of scrap acrylic....

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AT2XT Keyboard Adapter

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