|11-21-91 (24 years old)
|black logo on white background
|removable SDL, coiled cable, ps/2 connector (used cable, standard length)
|removable (two piece, key stem + key cap)
|clicky = buckling spring
|Designed when “real” typing on a quality keyboard was a required skill to use a $4000 IBM personal computer. PC mag link
(pre-dates the then new mouse-click and graphical user interface operating system later to be known as Microsoft Windows 3.1 and 95)
|Upper keyboard case and individual keys have been removed and fully cleaned by hand.
|The majority of model M keyboards do have a grill opening on the back of the keyboard case. However, only the 51G8572 and 1394540 actually have the speaker installed. Other interesting features that make these more like 1391401 (and less like other 1993+ Manufactured by IBM for Lexmark) include, drainage channels, removable SDL to ps/2 keyboard cable, multi-color printing on key covers, Ctrl/Act key.
|This keyboard is tested to work 100%. The keyboard assembly has been confirmed to be in functional, operational condition with a few missing rivet points which are within normal parameters for vintage hardware.
|Keyboard pre-selected as good candidate and passed initial testing to confirm mechanical condition. Upper keyboard case disassembled and individual 101 keys have been removed and fully cleaned by hand. Inspection of interior plate. Any missing rivets drilled out and replaced with M2 precision screws to restore internal integrity. Interior plate vacuumed to remove foreign debris. Keyboard re-assembled and re-tested post-cleaning. Individual photography of rear label. Photo gallery of typical restoration workflow.