HP C1405A 102-Key AT Keyboard 5-Pin DIN Mechanical Hewlett-Packard Vintage

HP C1405A 102-Key AT Keyboard 5-Pin DIN Mechanical Hewlett-Packard Vintage

The HP C1405A is a full-size 102-key AT-layout mechanical keyboard produced by Hewlett-Packard. It uses a 5-pin DIN connector and a coiled cord, connecting to IBM PC/AT and compatible systems through the standard AT keyboard interface. The switches are mechanical — an Alps-style square-housing switch is visible with a keycap removed — giving it the firm, tactile feel characteristic of late-1980s HP workstation keyboards.

Specifications & What's Included

• Model: HP C1405A, variant #ABA
• 102-key AT layout
• Switch type: Mechanical (Alps-style square-housing switches)
• Interface: AT keyboard (5-pin DIN connector)
• Cable: Coiled cord with 5-pin DIN plug
• Voltage: 5V DC
• Current draw: 200 mA MAX
• Certifications: UL Listed (Teaching/EDP/Business Equipment Accessory, Class 34K9), CSA
• FCC Class B compliant
• Country of manufacture: Singapore
• Includes: keyboard with attached coiled cord

Applications

The HP C1405A was designed for use with IBM PC/AT-compatible computers and HP workstations of the late 1980s that used the AT keyboard interface. The 5-pin DIN AT standard was the dominant PC keyboard connector from the mid-1980s until it was superseded by the smaller PS/2 mini-DIN connector in the early 1990s. This keyboard was commonly paired with HP Vectra desktop computers and similar AT-class machines used in business, engineering, and educational settings. Today, AT keyboards like this one are sought by vintage computer collectors and enthusiasts restoring period-correct PC/AT systems, and can also connect to modern systems using a passive AT-to-PS/2 adapter. The mechanical switches are a notable feature: Alps-style mechanisms were widely used in premium keyboards of this era and are valued for their tactile and audible feedback.