Keyboard; Major Assemblies - Control Data Corporation CDC CC63X Hardware Maintenance Manual

KEYBOARD
The detached keyboard provides for operator entry of symbols and
control codes. Each key, when depressed, sends an 8-bit serial
code and parity to the keyboards universal asynchronous
receiver/transmitter (UART). A similar code is sent when the
key is released. This allows the terminal program to monitor
the state of the keyboard and assign and/or define a resultant
activity. There are 104 keystations. Keyboard arrays are
available to support foreign language transmission. When using
a foreign language, the keyboard is modified by installing
selected keycaps. The keyboard contains an adjustable leg for
selecting one of two operating positions. There are three
keyboard modes, shift, lock, and control. These modes are
controlled by the terminal. The installation parameters allow
the selection of character generation to match the key-cap set.
LOGIC
DRAWER
ASSEMBLY
04350
CRT
MONITOR
I
I
J
LARGE OPTION
(I/F 4 SLOT)
LARGE OPTION
(I/F 5 SLOT)
I
DISPLAY
; YMONITOR
.{1
MAIN LOGIC
BOARD
Figure 4-2. Major Assemblies
4-4 62940034
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