RCA 301 Programmer's Reference Manual page 174

IOS (A, = 0)
Format
Operation —S
N —I
A Address — A specifies the tests to be performed as follows:
0
"1" Bit
In
2°
1
2
2 2
3
2
— Aj, A , A
2
B Address — HSM location of the next instruction to be executed if the condition or conditions being tested
are present.
Outline of Operation
The test (or tests) called for by the one bits in A
conditions tested is present, the contents of the P Register are transferred to STP and the contents of the B Register
are then transferred to the P Register. If no tested condition is present, the next instruction in sequence will be
executed.
Final Register Contents
(A)t = (A)(
(B) = (B),
f
Timing
56 p.s if a transfer is executed.
42 ps if no transfer takes place.
XIII-8
Numeric
Equivalent
1 Is the other computer non-operable?
Is the other computer in a receiving mode?
2
4 Is the other computer in a transmitting mode?
Has a character with incorrect parity been received or sent?
8
— Must be zeros (000).
3
are performed on the device selected by N. If any one of the
0
Test
Standard Location
STP (on transfer only)