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@zachlieberman @golan the Ultimarc arcade board can be programmed this way, too - it has a USB keyboard out, and a PS2 keyboard in, and types out a little menu, letting you push an arcade button then press a key to bind them together.
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@zachlieberman @golan it also has a janky custom bit of Windows software to program it - but whenever I have a PS2 keyboard around, I obviously do it this way