IBM 1390636 Model M Keyboard 5-Pin DIN AT Interface 1988 Vintage

IBM 1390636 Model M Keyboard 5-Pin DIN AT Interface 1988 Vintage

The IBM 1390636 is a full-size Model M keyboard manufactured in February 1988, bearing IBM's iconic buckling-spring key mechanism. This unit uses a 5-pin DIN connector and does not have a standard AT interface — buyers should confirm compatibility with their target system before purchasing. The keyboard retains its original coiled cable with right-angle 5-pin DIN plug as shown in the photos.

Specifications & What's Included

• Brand: IBM
• Part Number: 1390636
• ID Number: 1054971
• Model: Model M
• PIt No: J2
• Date of Manufacture: 22 February 1988 (22FEB88)
• Copyright: IBM Corp. 1985
• Connector: 5-pin DIN (right-angle, attached coiled cable)
• Interface: Non-standard AT — not a standard AT keyboard interface
• Switch Type: Buckling spring mechanical
• Layout: Full-size QWERTY
• Color: Beige
• Includes: Keyboard with attached coiled cable only — no adapter

Applications

The IBM Model M is one of the most celebrated keyboards in computing history, originally designed for IBM's PS/2 line in the mid-1980s and used broadly across IBM PC-compatible workstations and terminals of the era. This particular unit, dated to early 1988, predates the PS/2 mini-DIN standard and uses a 5-pin DIN connector, placing it in the transition period between IBM's older PC/XT/AT keyboard bus and the later PS/2 interface. Model M keyboards were standard equipment on IBM workstations throughout the late 1980s and into the 1990s and remain highly sought after today by vintage computing enthusiasts, collectors, and typists who prize the tactile and audible feedback of the buckling-spring mechanism. Compatibility adapters (5-pin DIN to PS/2, or PS/2 to USB) are widely available but are not included with this unit — buyers should confirm the connector type suits their system or adapter before purchasing.