IBM 50 Key Keyboard
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 | |
| Part number |
1395249 (printed keycaps) 1392554, 1392560 and probably others (relegendable keycaps) |
|---|---|
| Branding | IBM |
| Manufacturer | IBM, Lexmark |
| Layouts | 50-key with specialized keycap labels |
| Keyswitches | Buckling spring over membrane |
| Years of production | 1990-1995 |
The IBM Model M 50-keys is a sub-tenkeyless buckling spring keyboard with a matrix layout. Judging from the specialized keycap labels it might have been used as a cashiers keyboard or similar.
Models such as 1392554 or 1392560 use relegendable keycaps instead of printed keycaps.[1][2]
The M50 internal assembly is heavy, while the plastic clips that keep the assembly centered are very thin. The plastic clips can get damaged in shipping, even if the keyboard is well packed, if the package gets a lateral shock (for example if it gets dropped on its side). If buying an M50 it's recommended to ask the seller to disassemble the keyboard, and separately bubble-wrap the assembly and the case.
Gallery
P/N 1395249
Photos of an IBM model dated Aug 1990.
Closeup, keys
Bottom case with sticker
Closeup sticker, bottom case
Side view
Without upper case
Metal plate with sticker
2-Piece keycap and switch spring
Rear view
P/N 1392560
Photos of a Lexmark model dated May 1995.
Underside with sticker
Holes on the bottom casing
A closer look
Flip-out foot
Opening/closing the case
Barrel plate overview
Barrel plate support
Flippers overview
Closeup view
Tab
The keyboard controller
Another view
Membrane sheets in place
A membrane sheet
The other one
Bottom casing, internal view
Left hand side
Cable exit
Markings
More markings
Top casing, internal view
Markings
A broken clip
And another one
References
- ↑ Deskthority — IBM 1392554 Posted 2015-08-10. Retrieved 2024-04-15.
- ↑ Deskthority — An IBM M keypad that feels like an F. (pictures of an IBM-made 1392560) Posted 2017-12-01. Retrieved 2024-04-15.
