This project aims to give an alternative to those users making possible using a regular PC-like keyboard with the terminals. It is based on a modification of the TMK converter, so in fact it is compatible with pretty much anything PS/2-like as it has plenty of connectors onboard: DIN-5 for XT/AT keyboards, PS/2, and both DIN and RJ-45 connector variants for scancode 3 terminal keyboards.
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The terminal type (3278 or 5251) is automatically detected and you have a buzzer to replicate the solenoid clicker functionality and keyboard-id DIP switches for complete compatibility. This is only strictly for 5251, 3278 and close relatives, won't work with 3277, 5291, Displaywriter or others.
I won't go deep on technical details here as everything is documented on my Github repo: https://github.com/inmbolmie/Save-a-Term. There you have schematics, firmware, gerber files for PCB fabrication as well as STL files for a 3D-printed matching case.
It is easy and cheap to make it as a DIY project on a prototype board if you don't mind it to be ugly, as it is like your regular promicro TMK except for some extra cabling, a buzzer and a linear regulator. I have also some spare units so if you need one give me a touch by PM if you prefer something assembled.
