Control LED on a Tandberg TDV2200 keyboard

HolgerLembke

22 Mar 2016, 23:51

Hi!

I have this nice Tandberg TDV2200 keyboard and written my own keyboard driver for USB to attach to a PC. So far so usual.

My current task is to control the LEDs L1/L2/L3/L4/LINE/CAR/WAIT/ERROR and perhaps the beeper. As far as I see I can send data with 2400 baud to the keyboard, data makes its way through the EIA–422/3 receiver and ends at the T0 of the 8035 cpu.

Sadly nothing happens. No light, no sound, nothing. Can anyone help with some hints what to send?

Thanks!
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TDV2200.jpg
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wiesener

12 Mar 2021, 12:46

Sorry to hijack your old thread, but any chance you could share some details of your keyboard driver and setup?

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