Programming instructions

MNEMONIC OCTAL EVENT
SYMBOL CODE
TIME OPERATION
snl 740400 1 Skip if Non-zero Link. If C(L) is 1, the next
instruction is skipped.
If C(L) # 0, then C(PC) + 1 => C(PC).
szl 741400 1 Skip if Zero Link.
If C(L) = 0, then C(PC) + 1 => C(PC).
hlt
740040
immedi-
Halt. Stops the computer.
ately after
the comple-
tion of the
cycle.
If skips are combined in a single instruction, the Inclusive OR of the con-
ditions to be met will determine the skip. For instance, if both sza and snl
are indicated (octal code 740600), the next instruction will be skipped if
either the AC is zero or the Link is non-zero, or both.
If ral or rar is specified, cma, cml, oas may not be specified, and conversely.
If rtl or rtr is specified, cma, cml, cla, cll, oas may not be specified, and
conversely.
THE INSTRUCTION, law
The octal code for this instruction is 760000. Bits 5-17 are used to specify
a quantity to be placed in the AC. The effect of the law instruction is to place
itself in the AC.
law Y 76 8 psec Load AC With law Y.
INPUT-OUTPUT TRANSFER CLASS
The instructions in this class are used to effect information transfers
between the Internal Processor and external devices, via the Interface.
iot 760000 8 psec
Input-Output Transfer. Bits 4-13 of an iot
instruction determine the device and sub-
device to be selected. The presence of a 1 in
bit 14 will cause the AC to be cleared at
Event time 1. Bits 15-17 determine
hen
1
pulses are to be sent to the selected de
ice.
The bit assignment of the iot instruction is shown in Figure 7. The instruc-
tions of the iot class are described in Chapter 3.
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