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2821 CONTROL UNIT
Commands
Bit
Command
0
3
4
Test I/O
0
0
0
Sense
0
0
0
No-op
0
0
Printer
Write
x x x x x
0
0
Control (Skip Space)
x x x
x x
1
Read (1404)
1
0
0
0
Reader
Read
y
y
y
0
0
0
Control (Feed)
y
y
y
0
0
Punch
Write
z
z
z
0
0
0
Read (Punch Feed Read)
z
z
0
0
0
Modifiers
Bit
x x x x x
Printer
0
3
4
Space
1
0
0
0
0
Space 3
0
0
Skip to Chan
1
0
1
Skip to Chan 12
0
0
On Write, Carriage Operation is after Print.
On
Control, it is
immediate.
Bit
L___X__X
Reader
1
2
Data Mode 1 (Read)
y
y
0
Data Mode 2 (Read)
y
y
Read
&
Feed
&
Stacker Rl
0
y
Read
&
Feed
&
Stacker R2
y
Read
&
Feed
&
Stacker RP3
y
Read (No Feed No Stacker Se!)
1
y
Feed
&
stacker Rl (Control)
0
0
1
Feed
&
Stacker R2 (Control)
0
1
1
Feed
&
Stacker RP3 (Control)
1
0
90
S/360
IBM CONFIDENTIAL
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