Printer Compatibility Features - IBM 3708 Description

Carriage Return (CR):
The following data is sent to the printer:
l. Carriage Return (X' OD ').
2. If a carriage return delay is specified for the port to which the printer is
attached, a number of ASCII DEL characters (X' 7F ') are sent to the printer.
The number of DEL characters is determined by multiplying the configured
carriage-return-delay value by the ratio of the current column to the platen
width.
A CR order is not executed if located in a nondisplay and nonprint field; a blank is
sent to the printer.
Form Feed (FF):
An FF order is valid in any position and causes the 3708 to send a
FF character (X' OC ') to the printer. If a form feed delay is specified for the port,
that number of ASCII DEL characters (X '7F') are sent. (The printer buffer can
contain any number of FF print orders.)
Printer Compatibility Features
The 3708 provides the following printer compatibility features:
• CR at maximum presentation position (MPP) plus 1 (LU type 3 Unformatted
Mode)
After printing characters out to the page width (MPP), the 3708 performs an
automatic NL. The next codepoint in the buffer applies to the first print
position of the next line. If the character is a CR, it is ignored. For example,
the character A occurs at MPP followed by a CR and the character B. The
character A prints in the last position of the current line. The character B prints
in the first print position of the next line.
• NL at MPP plus 1 (LU type 3 Unformatted Mode)
An NL in MPP plus I causes two NL functions, because of the automatic NL
generated when reaching MPP. For example, the character A occurs at MPP
followed by an NL and the character B. The character A prints in the last
position of the current line. The character B prints in the first print position of
the current line plus 2.
• Null line suppression (LU type 3 Formatted Mode)
The 3708 does not print lines that contain only:
Nulls
- Attribute characters
- Nondisplay or nonprintable characters.
The next print position is the first print position of the next line.
Note: Null line suppression can be disabled by setting nonstandard operating
bit 12 to 1. If bit 12 is set to 1, lines containing all nulls, attribute characters,
nondisplay characters, or nonprintable characters appear as blank lines in the
printout, and EM, NL, and CR are considered valid.
• Automatic NL after the end of print buffer.
4-18
IBM 3708
Description
An NL occurs automatically after the print buffer completes for a formatted
printout.