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A4
Blank A
The A4 command blanks trace A and stops the sweep; the trace is not updated.
When A4 is executed, the contents of trace A are stored in display memory addresses 1 through 1001. A4 writes
instruction word 1072' into address 0. Therefore, any information stored in address PI is lost when A4 is executed.
If you have used address f3 for a graphics program or label, you may wish to save its contents before executing
A4.
For additional information, refer to Appendix A. The functions of the A4 command and front panel @ key are
identical. (See BLANK, B4, and TRSTAT)
OUTPUT 718;"A4;"
l
1072 is a machine instruction word that sets addresses 1 through 1023 to zero, and then skips to the next page of memory.
3 8 P r o g r a m m i n g
e
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