deskthority

Hi NathanA, thank you for your tips.

Regarding the timing of the PROG shorting work, I just left PROG shorted to ground and then plugged in the USB. From your description it sounds like the PROG shorting needs to be intermittent during power-up. That will be hard to do by myself with, for example ...

Regards. I am trying to USB-ify a 3278 keyboard and need advice. I just received a modelfkeyboards.com controller product item "xwhatsit Model F, Beam Spring USB controllers, solenoid drivers, solenoids - Beamspring USB-C (non-Displaywriter)". It has a white PCB labelled "Beamspring-USB-5251" with ...