Write Ds Li~ Address - IBM 2265 Manual

Write Printer. Transmission of data to the 2845 as the re-
sult of a Write Printer command does not interfere with
keyboard entry, a PRINT key operation, nor with the dis-
play of data. However, following depression of the PRINT
key, the 2265 keyboard is locked. Any command, other
than Write Printer, received at this time
will
stop the print
operation as will depression of the 2265 RESET key.
Write OS Line AddrE!ss (Figure 13)
The Write DS Line Address command may be addressed
to Display Stations only. To accept and execute the Write
DS Line Address command, the 2845 Display Control must
be equipped with the Line Addressing Feature. The Write
DS Line Address command combines the Write Addressed
DS command with line selection capabilities, thus enabling
selection· of a particular line on the display as the beginning
line of the message.
I/O Channel Sequences
and Responses
SOH }
2845 Address Addressing
2265 Address Sequence
Write OS Line Address (Hex
=
BO)
I
I
,
,
,
,
I
.,
The Write DS Line Address command causes the cursor
of the selected 2265 Display Station to be positioned at
the first character position of the specified line. The line
address is specified by the first character following the
STX line control character. Subsequent message data
(text) is displayed beginning at the first character position
of the addressed line.
The Write DS Line Address command enables one of
12 line addresses (or 15 line addresses depending on which
Display Format Feature is installed in the 2845) to be
selected. With the exception that the character immedi-
ately following STX specifies the line address, the Write
DS Line Address command operates the same as the Write
Addressed DS command. All sequences and responses
that apply to the Write Addressed DS operation apply
also to the Write DS Line Address operation.
2845 Sequences
and Responses
I
No Response ACK
STX
Line Address
Text
ETX
LRC
STX
I
Line Address
Text
ETX
LRC
Etc.
EaT
SOH
,
I
J
,
,
.1
I
I.
I
I
I
No Response
t
See "Error Recovery Procedures" for further I/O channel responses.
Figure 13. Write DS Lme Address, Sequence/Response Diagram
I
I
ACK NAK
t
Principles of Operation 41