Xerox 4215 Reference Manual page 211

Address Function
X'0017' Order
Parameters
Abort
System
Status
Available
SCS
Mode
Print
Processing
Order
Parameters
Non-LU1
Mode Print
Table D-3. Control unit output area (continued)
Description
The bits of this byte have different meanings for
different orders:
Reserved
Bit 0—7
Mode change
Code X'00'
Enter send state (LU1 mode only)
Code X'02'
Enter receive state (LU1 mode only)
Code X'03'
0—Extended order parameter not used
Bit 0
1—Extended order parameter valid
(byte 0022)
Bit 1 0—Not first segment of first-in-chain
1—First segment of first-in-chain
Bit 2
0—Not last segment of last-in-chain
1—Last segment of last-in-chain
Bit 3
0—SCS EBCDIC data code (Reserved)
Bit 4—6
Reserved
Bit 7 Ignored - SCS data stream processing only
The bits of this byte have different meanings for
different orders:
Bit 0
Reserved
Bit 1
0—Reserved
1—Reserved
Bit 2
Reserved
Bit 3
0—Character buffer control codes
X'01' through X'07'
are control codes in Base and APL
1—Character buffer control codes
X'01' through X'07' are control codes
only if the attribute buffer byte
equals xxxxx001 (APL).
Otherwise, control codes 01—07 are
translated to graphics.
Bit 4
0—Print without the attribute buffer
1—Print with the attribute buffer
Bit 5—6
00—Use machine default for Dual/Mono Case
01—Mono Case
10—Dual Case
Bit 7
COAX COMMUNICATIONS BUFFER