COAX COMMUNICATIONS BUFFER
Control Unit Output Area
The Control Unit Output Area (CUOA) that occupies locations
X'0010' to X'004F' of the PCIA contains information regarding
orders from the control unit and configuration information. The
CUOA is written by the cluster controller and read by the printer.
Table D-3. Control unit output area
Address Function Description
X'0010' Mode Bit 0—4
Bit 5
Bit 6—7
Reserved
Enable Set Attribute control code (SCS only)
Ignored
X'00011 Mode Bit 0—2
Bit 3—4
Bit 5—7
Reserved
00 — Host-directed copy
01 — Host-initiated local copy
10 — Operator-Initiated Local Copy
11 — Reserved
000 — No mode
001 — Data Stream Compatible
mode (DSC) - BSC
101 — Data Stream Emulation
mode (DSE) - SNA
110 — LU-1 mode
111 — Reserved
X'0012'
to
X'0013'
Message
Starting
Address
(MSA)
These two bytes define the point in the message
area where the current message begins.
X'0014‘
to
X'0015‘
Message
Length These bytes define the length of the current message.
If the length is zero, nothing is printed.
In SCS mode, data wraps from the end of the
character buffer to address X'0050.'
In non-SCS mode, data is loaded to the end of the
character buffer only.
X'0016'Order Code X'01'
Code X'02'
Code X'03'
Code X'05'
Code X'06'
Code X'07'
Abort
System status available
Print processing
Load translate tables (ignored)
DSC (ignored)
DSC load structured field (ignored)
Continuing next page
D-4 XEROX MRP FAMILY COAX COMMAND REFERENCE