IBM 3164 ASCII Manual page 125

Chapter 5. Programming considerations
84. Cancel Command
ESC S (outbound or from the keyboard)
When this command
IS
received. the display station performs the same function as the Cancel key
85. Enable/Disable Write Null Commands
ESC" :
ESC" ;
(Enable Write Null Command) (outbound)
(Disable Write Null Command) (outbound)
When the Enable Write Null command is received. the null characters in the outbound data stream
from the host are stored in the character buffer as null codes. in the same way as graphic
characters.
The Disable Write Null command causes the display station to ignore null characters from the host.
.A.fter paR. nul! characters from the host are ignored.
86. Enable/Disable Columnar Write Commands
ESC!
ESC!
(Enable Columnar Write Command) (outbound)
(Disable Columnar Write Command) ( outbound)
In the normal operations. the graphic character string is written horizontally in sequence. When
the Enable Columnar Write command is received. the CA/BA advances one row as a character is
stored. When CA/BA reaches the bottom in the page. the CA/BA wraps to the top without
changing its column.
If the Disable Columnar Write command is received. the display station advances the CA/BA as a
character is entered in the buffer.
87. Trace On/Off Commands
ESC space: (Trace On Command) (outbound)
ESC space; (Trace Off Command) (outbound)
These commands work in the same way as the Trace key.
88. Write Host Message Command
5-38
ESC
= ..........
ESC
=
(outbound)
Parameter: Host message This command is used to write a message/text from the host to an
80-character buffer of the IBM 3164. You can display the stored host messages/text on the 25th
line by using the Msg key or the Display Host Message command.
The host message can include the following characters/commands.
ASCII graphic characters (including a space character)
SI and SO Control Characters
SCS
GO/G1
commands
Erase EOl command
Set Field Attribute command
Set Character Attribute command
Set SH DW command
Set SHSW command
Other characters and control sequences are not allowed.
When an error is detected in Write Host Message command. the previously defined host message
will be destroyed.
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