RCA 301 Programmer's Reference Manual page 123

A Address—(Continued)
Magnetic Tape Station
— A A , A
1; 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)r = (A),
(B) = (B),
f
Timing
56 ^.s if a transfer is executed.
42 ^s if no transfer takes place.
"1" Bit
Device
— Must be zeros (000).
3
are performed on the device selected by N. If any one of the
0
Numeric
In Equivalent
2°
1
Is the
2
Is the tape in motion? (Tape mo­
2 1
tion will not be indicated during a
write to read delay.)
2
4
Has ETW been sensed?
2
3
2 8 Is the tape positioned on BTC?
& Is the tape moving in a reverse
2*
direction?
Standard Location
STP (on transfer only)
Tests
tape station inoperable?
IX-15