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The EM command clears display memory addresses 3072 through 4095, which contain instruction words and
amplitude information for trace C. The EM command loads the instruction word 1044 into addresses 3072
through 4095, and then establishes address 3072 as the current (in-use) address, placing this address in the display
address register. (See Appendix A for more information about trace C.)
The EM command is often incorporated in a routine that blanks the spectrum analyzer screen in preparation for
the display of custom graphics. Execute the following program line to blank the analyzer screen;
OUTF'UT 718; "EM;BLANK TRA;BLANK TRB; GRAT OFF; KSo; DLE OFF;"
The line above clears trace C memory, and blanks the graticule, characters, display line, and traces A and B.
Though the display can be blanked with the KSg command, which turns off the CRT beam, the above program
line is advantageous. It clears the display faster than KSg. In addition, the contents of traces A and B are saved, the
instrument state is not altered, and the beginning of trace C memory, address 3072, is established as the current
address.
To reinstate the analyzer display, execute the following program line:
OUTF'UT 718;"EM;CLRW TRA;CLRW TRB; GRAT ON; KSp;DLE ON;"
EM
Erase Trace C Memory
Programming 95
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