When the next variable is defined or the next array or memory block is declared, it will be put at this address and VARTOP will increase by the size of the object. VARTOP's current value can be obtained non-destructively with:
DIM A% -1
which places the value in
Unofficially, 6502 BASIC stores VARTOP in a word at address &0002.
-- beardo 14:13, 20 March 2007 (UTC)