RCA 301 Programmer's Reference Manual page 122

s
S Input/Output Sense (IOS)
General Description
This instruction tests the desired status of the selected input/output device and chooses one of two sequences
of instructions.
Format
Operation —S
N — Selects the input/output device to be tested according to the following:
Paper Tape Reader
Paper Tape Punch
Interrogating Typewriter
X Hi-Data Tape Group (10 or 30 KC Model)
Dual Tape Channel (2x6 switch 33 or 66 KC Model)
Dual Tape Channel (2 x 12 switch 33 or 66 KC Model)
33 KC Adapter
66 KC Adapter
Note #1: The 2x6 Switch Dual Tape Channel prohibits the inclusion of Hi-Data Tape Group #1.
Note -#2:
A Address — A specifies the tests to be performed as follows:
0
Paper Tape Reader or Paper Tape Reader or
Paper Tape Punch (100 cps) Paper Tape Punch (100 cps)
High Speed Paper Tape High Speed Paper Tape
Punch (300 cps) Punch (300 cps)
High Speed Paper Tape High Speed Paper Tape
Reader (1000 cps) Reader (1000 cps)
Interrogating Typewriter Interrogating Typewriter Interrogating Typewriter Interrogating Typewriter Interrogating Typewriter
IX-14
Device Device
The 2 x 12 Switch Dual Tape Channel prohibits the inclusion of both Hi-Data Tape Groups.
"1" Bit
Device
In
2°
1
2
2°
1
2
2
2
3
2
2 i
(Continued)
Unit #1
8
9
U
123456
1
123456
2
123456ABCDEF
J
L
Numeric
Equivalent
1
Is the selected device inoperable?
2 Is the selected device operating?
1
Is the selected device inoperable?
2
Has a read parity error occurred?
(This indicator is reset by a subse­
quent read instruction directed to
this device.)
4
Has "Program Interrogate" been
received ?
8 Has a write parity error occurred?
(This indicator is reset by a subse­
quent read instruction to this de­
vice.)
& Has "Message
ceived?
N
Unit # 2
ABCDEF
N
P
Tests
Erase" been re­