Control Data 3100 Reference Manual page 47

Examples of Keybeard Switch Functions
1. To enter data into the A register:
a. Depress the A register switch.
b. Enter all eight digits of the Communication register by depressing the ap-
propriate numeric key switches. *
c. Depress the TRANSFER switch.
d. Depress the KEYBOARD OFF switch.
2". To enter data into the
Q
register:
Depress the
Q
register switch and repeat steps b through d of example 1.
3. To enter the Program Address Counter (P register) with a specific address:
a. Depress the P register switch.
b. Enter the lower five digits of the Communication register by depressing the
appropriate numeric key switches.
c. Depress the TRANSFER switch.
d. Depress the KEYBOARD OFF switch.
4. To enter an operand at a specific address**:
a. Perform step 3.
b. Depress the EN switch.
c. Enter all eight digits of the Communication register by depressing the appro-
priate numeric key switches.
d. Depress the TRANSFER switch.
e. The count in the Program Address Counter has now incremented by one. If
data is to be entered into this memory location, repeat steps c and d for as
many succeeding entries as required.
f. Depress the KEYBOARD OFF switch when all data has been entered into
the successive group of memory locations.
5. To read an operand from a specific storage address:
a. Perform step 3.
b. Depress the SW switch.
c. Depress the TRANSFER switch.
d. The contents of the specified storage address are now displayed in the Com-
munication register. (The Program Address Counter is not incremented
when the TRANSFER switch is initially depressed.)
e. If the TRANSFER switch is depressed again, the Program Address Counter
is incremented by one, and the contents of the new address are displayed.
£. Depress the KEYBOARD OFF switch when all the desired memory loca-
tions within a successive group have been examined.
6. To enter zeros or another operand into all storage locations:
NOTE
Step 5 only permits the operator to examine the contents of specific storage locations. The
instructions are not executed during this operation.
*If all eight digit positions of the Communication register are not entered before the Transfer switch is
depressed, zeros will be entered into the remaining digit positions.
**The breakpoint switch may be used in lieu of this operation. Refer to example d, Figure 5-8.
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