IBM Professional Series User Manual page 356

Rx Register:
Byte 0 Byte 1 Byte
2
Byte 3
virtual
device
address
Ry Register:
Byte 0 Byte 1 Byte 2 Byte 3
VDEVTYPC VDEVTYPE VDEVSTAT VDEVFLAG
Symbolic Name Meaning:
VDEVTYPC
VDEVTYPE
VDEVSTAT
VDEVFLAG
Virtual dey ce type class
Virtual dey ce type
Virtual dey ce status
Virtual dey ce flags
Ry+ I Register:
Byte 0 Byte 1
RDEVTYPC RDEVTYPE
Symbolic Name
RDEVTYPC
RDEVTYPE
RDEVMDL
RDEVFTR
RDEVLLEN
Byte 2 Byte 3
RDEVMDL RDEVFTR
- or -
REDVLLEN
Meaning
Real device type class
Real device type
Real device model number.
Real device feature code for a
device other than the
keyboard/ display.
Current device line length for the
keyboard/ display.
The following chart lists the condition codes CP can return
for DIAGNOSE Code X'24', the meaning of each condition
code, and the registers where data is returned.
Appendix A. CP / CMS Interface A-I7