Texas Instruments 990 Operation Manual page 47

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• Use of the backspace (CTRL H) on the terminal keyboard deletes single characters
from the current parameter or command mnemonic only. Once a parameter has been
validated, it may not be changed.
• Use of the delete (RUB OUT) key on the terminal keyboard removes only the current
parameter, not the entire command.
The following application notes apply to the use of commands:
• The user must realize that the command input is being checked as it is being entered.
This helps prevent entering a long command with an error. Make sure that a parameter
is correct before entering the terminator for it.
• The user may abort the current command by pressing the escape (ESC) key on the
terminal keyboard.
3.4.1.9 Error Messages. Following is a list of errors the user may encounter when entering
keyboard commands and the meanings of the error codes.
Error Code Meaning
MPOO Invalid parameter entered, invalid hexadecimal number entered, or maximum
parameter list length exceeded.
MSOI
MX03
Invalid command. The first two characters do not match any known command.
Overlay resident command not in memory. The command must be loaded into
the transient area before it can be executed.
A complete list of the error codes appears in Appendix E.
3.4.1.1ONotaflonal Conventions. The notational conventions used in the syntax definitions of
the keyboard commands are as follows:
< >
Item to be supplied by the user. The term shown within
angle brackets is a generic term.
[ ] Optional item - may be included or left out, at the.
user's discretion. Items not enclosed in brackets are
required.
{} Choice to be made from two or more items, one of which
must be included.
Items in capital letters in the syntax definition are entered into the command statement exactly
as shown.
The fields in the command (the command mnemonic and the parameters) are separated by either
commas or strings of one or more blanks. This choice is shown symbolically as:
3-9
Digital Systems Division .