14 Rocket Model 204 Terminal User’s Guide
Echoing
• LEECHO controls the echoing of logical lines that contain ERASE or
FLUSH characters.
• CSECHO controls the echoing of physical lines entered as dummy string
substitutes.
• LSECHO controls the echoing of logical lines in which dummy string
substitutes have been entered.
The initial Model 204 values for these parameters cause terminal input lines to
be echoed. No other echoing takes place. The system manager can change
these initial settings for an installation at the time of system initialization.
Model 204 echoes a given portion of input no more than once at each level. If
the bits are set as follows and a given line includes editing characters and
dummy strings, it is echoed only once at the line level, even though all three
parameters call for the line to be echoed:
LECHO = X’05’
LEECHO = X’05’
LSECHO = X’05’
PROMPT and SUB parameters
Use of LSECHO and CSECHO is related to the settings of the parameters
PROMPT and SUB, although the actual echoing process operates
independently of PROMPT and SUB. Refer to the Model 204 Parameter and
Command Reference Manual for a detailed description of these commands.
Operations for line echo
Before lines are echoed, Model 204 performs the following operations on the
input in this order:
1. FLUSH and ERASE editing characters are applied, if enabled (that is, if
EDIT = 1 or 5).
2. Physical line is echoed, if specified by the physical line echo parameters
CECHO, CEECHO, and CSECHO.
3. Line continuation is interpreted using INCCC, and succeeding physical
lines are read in, if necessary. Physical input lines are echoed as in Step 2,
until the reading of the logical line is completed.
4. All characters that follow the last nonblank character in a logical line are
deleted.
5. Specified substitutions are made in dummy strings.
6. Logical line is echoed in accordance with the settings of the logical line
echo parameters: LECHO, LEECHO, and LSECHO.
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