IBM 3151 User Manual page 130

Ascii display station, for the cartridge to emulate ibm and dec' terminals
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Reference Information (SYSTEM ATTACH)
Parameters
pa:
Bit
Content
Description
7
B'l'
Always I
6
B'O'
Always 0
5
Send Key
B'O'
Generates a CR character when the Send key
is pressed'
B'l'
Generates a CR/LF character when the Send key
is pressed
4
B'O'
Reserved
3
Send Null Suppress
B'O'
Off
B'l'
On'
2
Lock Keyboard and Keep MDT Bit
B'O'
Off'
B'l'
On
I
Send Data Format
B'O'
Text LTA*
B'l'
AID LTA
op:
The operation-specifier parameter op can be added. This parameter must be
placed at the end of the parameter field. If this parameter is specified, bits 7 and
6 of the parameter pa must be B'O' and B' I', respectively .
means the default setting.
Chapter 5. Reference Information
5-21

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