Used by the routines at STK_F_ARG, STACK_NUM, get_mem and st_mem.

The address of this routine is found in the table of addresses. It is called via the calculator literal +31 by the routines at BEEP, CIRCLE, DRAW, CD_PRMS1, S_RND, e_to_fp, PRINT_FP, series, n_mod_m, int, exp, ln, get_argt, sin, tan, atn, asn, sqr and to_power.

This subroutine moves a floating-point number to the top of the calculator stack (3 cases) or from the top of the stack to the calculator's memory area (1 case). It is also called through the calculator when it simply duplicates the number at the top of the calculator stack, the 'last value', thereby extending the stack by five bytes.