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The Al command enables the clear-write mode, which continously displays any signals present at the spectrum
analyzer input.
OUTPUT 718;"Al;"
The Al command initially clears trace A, setting all trace A elements to a zero amplitude level. The sweep trigger
then signals the start of the sweep, and trace A is continuously updated as the sweep progresses.
V I D E O _
DETECTOA
In addition, subsequent sweeps send new amplitude information to display memory addresses 1 through 1001.
Al also writes instruction word 1040* into address 8. Therefore, any information stored in memory address B is
always lost whenever Al is executed.
If you have used address fJ for a graphics program or label, you may wish to save the contents of address P, before
1040 is a machine instruction word that causes the analyzer to set address 1 through 1023 to zero, and draw trace A.
ANALOQ
DISPLAY
TO
MEMORY
CONVERTER ;;;;E/
l - 1 0 0 1
Clear-Write A
REFRESH D'SPLAY
P r o g r a m m i n g 3 5
A l
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