Keyboard Switch Functions - Control Data 3100 Reference Manual

TABLE 5-1. KEYBOARD SWITCH FUNCTIONS
SWITCH NAME ILLUMINATED DESCRIPTION
8' to 8
3 Yes
Enables data to be manually entered into Index registers B',
8 2 , or 8 3 from the keyboard.
P Yes
Enables an address to be manually entered from the keyboard
into the P register.
A
Yes
Causes both A and Q to be displayed, but permits entry only
into
A.
Q Yes
Causes both A and Q to be displayed, but permits entry only
into Q.
EU*
Yes
Causes EU and EL to be displayed. Manual entry is not possible.
EL*
Yes
Same as EU.
EO*
Yes
Causes ED to be displayed and enables manual entry directly
into this register. Refer to ED register description.
KY8D
OFF Yes Deactivates all keyboard controls.
(Keyboa rd Off)
EN
Permits data to be manually entered into storage while the
(Enter)
Yes computer is stopped. First address of sequence must be previous-
ly entered into
P.
Pressing the TRANSFER switch advances P.
SW
Permits unexecuted instructions to be read from consecutive
(Sweep)
Yes storage locations. First address of sequence must be first en-
tered into
P.
Pressing the TRANSFER switch advances P.
WRITE
Permits keyboard entry into the storage location specified by the
STO Yes
thumb-wheel switches. Entry occurs each time the TRANSFER
(Write Storage)
switch is pressed whether the computer is in the GO mode or
stopped.
READ Permits the contents of the storage register location specified
STO Yes by the thumb-whee'l switches to be displayed. The display rate
(Read Storage) is determined by the Auto-Step control.
KY80 CLR
Yes Clears the Communication register.
(Keyboard Clear)
GO Yes
Starts the program execution at the address specified by the
P register. Not used for Sweep or Enter operations.
SW/EN
CaNT
Yes
Enables Sweep or Enter operations to proceed continuously
(Sweep/Enter through storage without pressing the TRANSFER switch.
Continuous)
STOP
Yes Stops the computer at the end of the current instruction.
TRANSFER No
Transfers data in the Communication register to a selected
register or storage location.
MC
No
Performs both an internal and external clear. Disabled when GO
(Master Clear)
switch is depressed and the computer is in the
GO mode.
These switches, when pressed one at a time, allow, entry of that
o
through 7 No particular digit into the Communication register in the binary
digit position denoted by the active digit indicator.
Depressing either of these switches permits entry of that digit
8
and
9
No
directly into the ED register. The option must be present in the
system and the ED register selection switch depressed.
Depressing either of these switches permits entry into the sign of
+
or -
No
ED digit (refer to Figure 5-2) in the ED register. These switches
(Plus or Minus) may be depressed at any time during the numeric entry of ED. The
sign of ED may be changed by depressing the opposite sign switch.
*Depressing any of the switches associated with the arithmetic options when the optional logic is not present
produces equivocal results.
5-9
Rev. B