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The address of this routine is found in the table of addresses. It is called via the calculator literal 59 by the routine at S_LETTER.
This subroutine is only called from 10071 and is used to perform a single arithmetic operation. The offset that specifies which operation is to be performed is supplied to the calculator in the B register and subsequently transferred to the system variable BREG.
The effect of calling this subroutine is essentially to make a jump to the appropriate subroutine for the single operation.
fp_calc_2 13218 POP AF Discard the RE_ENTRY address.
13219 LD A,(23655) Transfer the offset from BREG to A.
13222 EXX Enter the alternate register set.
13223 JR SCAN_ENT Jump back to find the required address; stack the RE_ENTRY address and jump to the subroutine for the operation.
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