Kaypro 2 - 13-01.TIFF

13.9 KEYBa\RIE
'Ihe 76-key alphanumeric, detachable keyboard is cormected to the computer by a
fuur-wire cable and is :PJwered by +5 VDC through the cable. The CAPS LCCK
indicator light allows a quick check on whether the keyboard is receiving
p:::Mer.
'Ihe impedance 0 f the cormecting cable can be a critical factor in proper
operation of the computer. Replacement of the standard cable with a phone
cord can create mal functions in signal transmission to the computer. 'lhis is
because the wire in phone cords is too small; therefbre, the impedance over
the total length 0 f the cord can be too high fur reliable operation.
Wire in the standard keyl:x>ard cable is 28-gage copper, and the cable length is
six feet. Should you desire a longer keyboard cable, restrict the length to
not more than twelve feet, and use wire no smaller than 28 gauge.
Keyboard cable Pinouts
Pin 4 (Black)
pin 3 (Red)
Pin 2 ( Green)
Pin 1 (Yellow)
- serial Data out (to keyboard), 'lTL level.
- Ground
- serial data in (£rem keyboard), 'lTL level.
- +5 VDC
13-1