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Chapter 5. Programming considerations
11
Enable LRC
12
Enable Program Color
5-42
This option is used to enable the terminal to generate a longitudinal
redundancy check (LRC) character at the end of a data transmission
This function is effective in all modes; echo, character. and block.
The LRC character is automatically generated and sent to the host Just
after the turnaround character.
In CRTS mode, the display station turns off the RTS signal after sending
the LRC character. The LRC register is cleared at the beginning of the
data transmission, The LRC character is calculated by taking an
"exclusive or" independently on each of the individual levels of the
transmitted code excluding the parity bit, The turnaround character is
included in the LRC accumulation. The correct value of the parity bit for
the LRC character is defined so as to maintain the specified parity.
The IBM 3164 sends back the ACK or the NAK character to the host in
response to the turnaround and LRC characters. ACK is transmitted for a
correct LRC character, and NAK is transmitted for an incorrect one.
Even if the display station receives an ACK or a NAK from the host
system in response to an LRC character, it does not take any action. For
a NAK. the host will send an appropriate Read command in order to
request the same data again, For a possible retransmission of the text.
the Lock KBD and Keep MDT option must be set to on,
In Default Color mode. the IBM 3164 emulates the IBM 3163 and
displays the four colors of red. green, blue, and white, Which color is
displayed for that field depends on the following field and character
attribute combinations:
Foreground Color
Green
Blue
Red
White
Combinations of FA/CA
Unprotected and normal display
Protected and normal display
Unprotected and high intensity
Protected and high intensity
The background color will be black and the field attribute position will
also be black, The underline cursor will appear in white, The block
cursor will appear in the foreground color and a character/symbol on the
block cursor will be displayed in black, The divider line will appear in
blue and characters/symbols in the operator information area in green,
In the case of a reverse attribute. the foreground color will change to the
background color and vice versa,
When the Program Color option is enabled, the terminal is able to display
eight colors instead of the original four. The eight colors are:
•
Black (background defauit coior)
•
Red
•
Green (foreground default color)
•
Blue
•
Yellow
•
Magenta (Purple)
•
Turquoise (Light Blue)
•
White.
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