Figure 6. 3803-2/3420 Commands - IBM 3803 Manual

Command Byte
0 1 2 3 4 5 6 7 Hex
Burst Commands
Write 0 0 0 0 0 0 0
1
01
Read Forward 0 0 0 0 0 0 1 0 02
Read Backward 0 0 0 0 1 1 0 0 OC
Sense 0 0 0 0 0 1 0 0 04
Sense Reserve 1 1 1 1 0 1 0 0 F4
Sense Release 1 1 0 1
,.Q
1 0 0 04
Request Track-In-Error 0 0 0 1 1 0 1 1 1B
Loop Write-To-Read 1
0
0 0 1 0 1 1 8B
Set Diagnose 0 1 0 0 1 0 1 1 4B
Motion Control Commands
Rewind 0 0 0 0 0 1 1 1 07
Rewind Unload 0 0 0 0 1 1 1 1 OF"
Erase Gap 0 0 0 1 0 1 1 1 17
Write Tape Mark 0 0 0 1 1 1 1 1 1F
Backspace Block 0
0
1 0 0 1 1 1 27
Backspace File 0
0
1 0 1 1 1 1
2F
Forward Space Block 0 0 1 1 0 1 1 1 37
Forward Space File 0 0 1 1 1 1 1 1 3F
Data Security Erase 1 0 0 1 0 1 1 1 97
Non-Motion Control Commands
No-Operation 0 0 0 0 0 0
1 1
03
Diagnostic Mode Set 0 0 0 0 1 0
1 1
OB
Mode Set 1 See Below.
Mode Set 2 See Below.
Data
Set Density Parity Converter Translator
200 [ 556
J
800 Odd
1
Even
Mode Set 1 Iseven-Track}
On
l
Off On
1
Off
x x x x
0 0 0
1
0 0
1
1 13
x x x x
0 0 1 0 0 0 1 1 23
x x x x
0 0 1 0 1 0 1 1 2B
x x x x
0 0 1 1 0 0 1 1 33
x
x
x
x
0 0 1 1 1 0 1 1 3B
x
x
x
x
0 1 0 1 0 0 1 1 53
x x x
x
0 1 1 0 0
0
1 1
63
x x
x
x
0
1
1 0 1 0 1 1 6B
x
x
x
x
0 1 1 1 0 0 1 1 73
x
x x
x
0 1 1 1 1 0 1 1 7B
x
x
x
x
1
0
0 1 0 0 1
1
93
x x x x
1 0 1 0 0 0 1 1 A3
x x x
x
1 0 1 0 1 0 1 1 AB
x
x
x x
1
0
1 1
0
0 1 1 B3
x x x x
1 0 1 1 1 0 1 1 BB
Mode Set 2 lNine-Track)
800 1600 6250
x
1 1 0 1 0 0 1 1 03
x
1 1 0 0
0
0 1 1 C3
x
1 1
0
0
1 0
1 1 CB
Note: Seven-track Mode Set 1 commands are treated as 'no-op reset sense' when issued
to a tape control without the seven-track NRZI feature.
Figure 6. 3803-2/3420 Commands
22
3803-2/3420 Subsystem Description