P/N 51G8572
Type
Model M Enhanced Keyboard with Speaker
OEM
IBM, Lexmark
Switches
IBM membrane buckling springs
Earliest Appearance
1993
Key Count
101
Original Keycaps
PBT with dye-sublimated legends
Casing Colour
White
Branding
IBM grey oval badge
Connection
Set 2/AT over PS/2
Layout/Language
US ANSI
More about this type of keyboard...
The IBM RISC System/6000 Keyboard was a variant of the Enhanced Keyboard featuring an integrated speaker on the bottom side of the casing. The speaker is believed to act as an audible cue when keys are pressed, similar to the purpose of solenoids in some earlier Beam spring and Model F keyboards. The speaker connects via a usually unused pin in the PS/2 plug, thus the speaker cannot be used on other systems without intercepting the signal with an additional separate circuit.