The keyboard is manufactured by CORTRON.
Part No. 25-500257
Cust No. D-02-00092-00
Since the keyboards themselves can be SO expensive:
Let's decode all keys on the proprietary UNIX PC Keyboard.
VERY good info on comp.sys.3b1 on hacking the keyboard hardware.
And Chris Smith has found the pinout from the Reference Manual.
5 6 7 8
: : : :
1 2 3 4
Chassis Ground to JK-shield
with "JK" being the jack on the system board into which the keyboard
I inquired over at Deskthority.net
DoN Nichols shares golden information on comp.sys.3b1 about how to reverse engineer these keyboard signals:
And today, Cpro provided this golden URL: https://peterbjornx.nl/vtkbd/
Now, notice that this Tektronix keyboard seems to have the same proprietary plug end as the Unix PC's keyboard. It doesn't have the right-angle end where the cable comes out of the connector housing, but the physical connector is the same. Is this a coincidence?
Below From Tektronix 119-2468-03 Terminal Keyboard