Control LED on a Tandberg TDV2200 keyboard


22 Mar 2016, 23:51


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?

TDV2200.jpg (652 KiB) Viewed 739 times


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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