Tektronix 4023 Service Manual page 41

Characteristics-4023 Service
STRAP
NAME
BUSY FUL (Busy on
Full)
CONSOLE LOCK
S P 2 - D
IC
LOCATION
371
351
KEYBOARD INTERFACE BOARD (cont)
(A4)
STRAP OPTIONS
TYPE:
FACTORY
or SITE
FACTORY
SITE
FUNCTION
Standard un-cut. When cut, the Terminal will not generate a
terminal busy (TBUSY) signal on page full.
Standard OUT. When the strap is placed so that one of the
other minibus signals is strapped in, its going low will
prevent operation of the keyboard. This includes character
keys, clear, insert and delete character/line, etc.
SP1 - D
-----4....--
A Iowan this line locks
SW1-D
CR DOES LF
0U
0
L____ _ ___
J
IN BUF OUT
FF ERASE
LF DOES CR
OUT IN
J43
2-18
out the keyboard
OUT
29
SITE
149 FACTORY
89
SITE
This strap can be positioned to affect the line feed circuits
as follows:
BUFFER-This is standard. With the console DIRECT/
BUFFER switch to BUFFER, pressing the RETURN
key will also perform a line feed. However, the computer
generated CR will not generate a line feed.
IN-Permits keyboard RETURN key and computer
generated CR's to also perform line feeds.
OUT -A carriage return does not simultaneously gen-
erate a line feed, regardless the origin of the carriage
return.
Standard un-cut. When cut, the Form Feed (FF) Control
Character by itself will perform a clear page function. When
not cut (standard) F F must be preceded by the ESC
Control Character to perform the clear page function.
The standard strap position (OUT) provides a line feed only
upon receipt of the LF code. The I N position provides a
carriage return with LF. When the Optional Data Com-
munications Interface is used, Interface wiring will connect
to this plug, permitting the LF-CR/LF switch on the
Interface switch panel to control the Terminal effect caused
by LF.
®