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My BASIC Notes

FRE()
Abbreviation: F <SHIFT+R>

TYPE: Function
FORMAT: FRE ( <variable> )

Action: This function tells you how much RAM is available for your program and its variables. If a program tries to use more space than is available, the OUT OF MEMORY error results.
The number in parentheses can have any value, and it is not used in the calculation.

NOTE: If the result of FRE is negative, add 65536 to the FRE number get the number of bytes available in memory.

EXAMPLES of FRE Function:

PRINT FRE(0)
10 X = (FRE(K)-1000)/7
950 IF FRE(0)< 100 THEN PRINT "NOT ENOUGH ROOM"

NOTE: The following always tells you the current available RAM: PRINT FRE(0) - (FRE(0) < 0)* 65536