Spectrum ROM: Routine at 13218

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.

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.