BTC LAK55XXK-A1 BTC-55XXK 101-Key AT Keyboard Windows Certified PS/2 5539KB

BTC LAK55XXK-A1 BTC-55XXK 101-Key AT Keyboard Windows Certified PS/2 5539KB

The BTC LAK55XXK-A1 (model BTC-55XXK) is a full-size 101-key AT-layout keyboard with Windows logo certification, connecting via a 5-pin DIN (AT/PS/2) connector. Made in South Korea, this keyboard was produced during the mid-1990s transition period when Microsoft introduced Windows key certification for peripherals. It has been tested with Windows 7 and is in good working condition.

Specifications & What's Included

• Brand: BTC (Behavior Tech Computer)
• Model: LAK55XXK-A1 / BTC-55XXK
• Part Number: 5539KB 1.0 US H02
• Layout: 101-key US QWERTY AT layout
• Connection: 5-pin DIN AT connector (PS/2-compatible with adapter)
• Windows Certified: Yes — Windows logo badge on top panel
• Status indicators: Num Lock, Caps Lock, Scroll Lock LEDs
• Country of Manufacture: South Korea
• FCC ID: LAK55XXK-A1
• Includes: Keyboard with attached cable only

Applications

AT-interface keyboards like this BTC model were the standard PC input device throughout the late 1980s and 1990s, designed for IBM-compatible desktop computers with AT-style motherboards. The 5-pin DIN connector is native to AT systems, though it can be used on PS/2 motherboards with a passive DIN-to-PS/2 adapter. The Windows logo certification indicates the keyboard meets Microsoft's hardware compatibility requirements for Windows 95 and later. These keyboards remain popular for use with vintage or retro IBM-compatible PC builds, industrial computer systems that still run legacy AT-bus hardware, and collectors restoring period-accurate workstations from the mid-1990s era. The 101-key layout is the standard US extended layout that became universal on IBM-compatible PCs after the introduction of the IBM AT in 1984.