Marquardt Military Keyboard 7069.3111

Marquardt Military Keyboard 7069.3111
Manufacturer	Marquardt
Layouts	Slightly modified ISO
Keyswitches	Marquardt Series 6184
Switch mount	Plate mounted
Interface	PS/2 for keys, RS232 (1200 Baud) for trackball over a DA-15 D-SUB connector
Rollover	NKRO
Weight	3.38 kg

The Marquardt 7069.3111 is fullsize, plate-mounted keyboard manufactured by Marquardt for the Deutsche Bundeswehr.

The keyboard was part of the HEROS-System (Heeresführungs - Informationssystem für die Rechnergestützte Operationsführung in Stäben) and consisted out of a Digital Equipment DECpc433 mounted inside a EDKA aluminium box. The keyboard itself was attached inside the box top.

The keycaps are Cherry MX-compatible double shots.

The housing is made out of aluminium, with the bottom plate being 2mm and the top being 6mm thick.

Pinouts

Even though equipped with a 15 Pin D-Sub connector the keyboard uses ordinary PS2 signalling, therefore it can easily be used on modern PCs. The pin out is as follows^[2]:

PCB connector	Signal	D-SUB	Cable colour
Pin 1	+5V	Pin 15	Brown
Pin 2	GROUND	Pin 7, 11, 14	White
Pin 3	KDB_CLK	Pin 13	White
Pin 4	KDB_DATA	Pin 12	Green
Pin 5	RS232-MOUSE	Pin 2	White
Pin 6	Unknown	Pin 4	Yellow

The serial signal for the trackball operates at a speed of 1200 Baud. The trackball can be put into operation with the following addition to xorg.conf^[2]:

,----[ xorg.conf ]
| Section "InputDevice"
|    Identifier  "heros ball"
|    Driver      "mouse"
|    Option      "CorePointer"
|    Option      "Sensitivity" "2.0"
|    Option      "Device"      "/dev/ttyS0"
|    Option      "Protocol"    "mouse systems"
| EndSection
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