IBM 6360 User Manual

the keyboard, and the system deter-
mines which keys will appear as
typamatic to the operator.
All keys are active, however some keys
may be blank, or may have different
functions, depending on the software
in use.
Shift Shaft
Assembly
Key Module
Assembly
Figure 5-5. Shift-Lock
Mechanism
Keyboa rd Electron ics
Stabilizer
Restoring
The pad card and keyboard logic card
are electronic parts of the keyboard.
The keyboard logic card is connected
to the pad card through a 30-pin con-
nector and is the interface between
the pad card and the system electron-
ics.
The capacitor plates for each key mod-
ule position on the pad card are con-
tinuously checked for changes in their
electrical conditions. Pressing a key
causes the fly plate to move away from
the pad card, changing the condition
of the capacitor plates (Figure 5-6).
Pressing a Type B key moves the
flyplate toward the pad card. All
other keyboard electronic operations
are the same for Type B with the
exception of the flyplate movement.
~~KeYM~UleS
Fly Plate
Capacitor Plates
Figure 5-6. Key Module and Capacitor
Plate
These changes in the electrical condi-
tions of the capacitor plates (two for
each key module) are read by the
microprocessor on the logic card. The
capacitor plates are connected by 12
drive lines and 8 sense lines, forming
a 12x8 matrix (Figure 5-7).
One of the capacitor plates is con-
nected to a drive line, and the other
is connected to a sense line. The
microprocessor will pulse a drive line
and then check a sense line (through a
sense amplifier) to see if there has
been a change in the capacitance as a
result of fly plate movement.
The
microprocessor pulses the same
drive line again and checks the next
sense line. After checking all sense
lines, the microprocessor pulses the
next drive line and checks each sense
Chapter 5. Keyboard 5-5

IBM 6360 Specifications

General

Brand	IBM
Model	6360
Category	Desktop
Language	English