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SNKB-M1997-BT4-122

Notes

This keyboard was featured in my Differences between and classifications of 122-key Model Ms comparison topic.

Original specs/details

Full Name
IBM Personal System/2 Host Connected Keyboard
Part Number
1397003
Type
Model M Type IV 122-key Keyboard
Nickname
Battlecruiser
Switches
IBM membrane buckling springs
Feet
Single-setting elongated flip-out feet
Connection
Cable
Cable
Grey coiled detachable SDL to PS/2
Form Factor
120%
Production Date
1997-06-17
Acquisition Date
2021-02-24

About this keyboard type

The Type IV 122-key Model M terminal keyboard is a version of the Type III designed to be natively compatible with PCs to serve in terminal emulation roles. Officially called the IBM Personal System/2 Host Connected Keyboard, Type IVs were relatively rare but for a long time were the only 122-key Model Ms easily capable of modern usage until Soarer's Converter became widespread. Visually, Type IVs look like Type IIIs except all IBM-branded versions had lock-light LEDs as standard and come with modular SDL connections capable of accepting an AT or PS/2 plug cable. IBM also started a practice producing Type IVs under third-party branding to companies that offer terminal emulation services, which Unicomp continues to do to this day. Unicomp also produces a version of the Type IV for consumer usage called the Unicomp PC-122. Like the Type IIIs, the 24-key function key block was only labelled with an "Fxx" nomenclature.