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13940: THE 'LEN' FUNCTION (offset 30)
The address of this routine is found in the table of addresses. It is called indirectly via fp_calc_2.
This subroutine handles the function LEN A$ and returns a 'last value' that is equal to the length of the string.
len 13940 CALL STK_FETCH The parameters of the string are fetched.
13943 JP STACK_BC The subroutine exits via STACK_BC which gives the correct 'last value'.
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