IBM 5100 Maintenance Information Manual page 211

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The first three bytes of the 10CB contain the following
information:
Byte 0: Device Address
00
Video display and processor
01 Common and language ROS
02 Not used
03
Not used
04
Keyboard
05 Printer
06
Not used
07 Not used
08
Not used
09 Not used
OA Serial I/O
OB
Not used
OC
Print plot
00 Not used
OE
Tape drive
OF Not used
Byte 1: Address for Tape
Tape
80 Subdevice 1 Internal
40 Subdevice 2 External
20'
Subdevice 3 RPQ (2nd external)
10 Subdevice 4 Not used
08 Subdevice 5 Not used
04 Subdevice 6 Not used
02 Subdevice 7 Not used
01 Subdevice 8 Not used
'The 5100 may either have two auxiliary tape units attached,
or an auxiliary tape unit and a printer attached; but only
two I/O devices may be attached to the 5100.
Byte 2: Command Code (controls the
various I/O devices)
Tape Printer
00 Sense Sense
01 Read Invalid
02 Write Print
03 Write last Print
04 Find Invalid
05 Mark Invalid
06 Initialize and Invalid
mark
07 Rewind Invalid
08 Forward space Invalid
record
09 Backspace Invalid
record
OA Find next Invalid
header
OB Write header Invalid
OC Invalid Invalid
00 Invalid
Plot function
OE Invalid Invalid
OF Invalid Invalid
10 Invalid
Invalid
11 Invalid Invalid
FD Invalid Diagnostic
FF Invalid Invalid
Internal Operation of the 5100 4-13