Used by the routines at BEEP, OPEN, FETCH_NUM, IF_CMD, FOR, NEXT, NEXT_LOOP, CIRCLE, DRAW, CD_PRMS1, S_RND, S_PI, S_LETTER, LET, DEC_TO_FP, STACK_BC, INT_TO_FP, e_to_fp, FP_TO_BC, LOG_2_A, PRINT_FP, compare, n_mod_m, int, exp, ln, get_argt, cos, sin, tan, atn, asn, acs, sqr and to_power.

The floating point calculator is entered at CALCULATE.