Description

Used Focus FK-5001 keyboard with genuine white Alps.  The PCB and the calculator have been removed (non-destructively, I believe), and the switches hand-wired to an RP2040 controller currently running KMK, but easily enough reprogrammed for QMK or ZMK.  In the calculator screen’s place there is a two-way (no button press) rotary encoder.  All keycaps are original except for F6, which was sourced from a similar vintage Focus keyboard, but is a bit lighter.

If purchased, I will test all keys, touch up any cold joints if found, and send a video of all keys registering.  I will include the original PCB, the calculator module (which was working when pulled), a template for the infocard insert, and a crude diagram of the matrix.  The 5001 boards did not use a rechargeable battery, so their calculator modules tend to be in better shape than one from a 9001.