Texas Instruments 990 Manual page 107

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2.3.2.3 Special Verbs. Two special verbs can be used with the 911 VDT diagnostic to make the
diagnostic more versatile and to allow more specific fault isolation. Those verbs are CU (Cursor
Move) and CD (Modify VDT Memory /Scope Loop Verb).
Cursor Move Verb. The Cursor Move verb permits the operator to move the cursor from any
memory location to any other memory location (displayed or not displayed). Initially, the verb
performs the following:
I. Resets Self-Test and clears Keyboard Interrupt Enable
2. Enables video and nonblinking cursor.
Cursor commands are used with the Cursor Move verb to specify the function. The cursor
commands are as follows:
•
U - Up one position
•
D - Down one position
•
L - Left one position
•
R - Right one position
•
C - To column zero
•
Z - To row zero
•
A - Direct cursor address
•
I - Iterate direct cursor address
The Cursor Move verb is entered from the keyboard of the hot mock-up system's Model 733
ASR Data Terminal by typing -CU-x, where x is any of the cursor commands except A and I,
in response to the diagnostic message, VERB?. The cursor commands, A and I, are entered as
follows:
1. Wait for message, VERB?.
2.
Enter -A or -1.
3. Wait for message -nnnn (hexadecimal value of current cursor location).
4. Enter -mmmm (hexadecimal value of desired cursor location).
Following are examples of printed lines following entry of the Cursor Move verb:
• VERB? -CU -U
• VERB? -CU -A -0377 -0000
Entering
@
terminates the Cursor Move verb.
2-5 Digital Systems Division