Spectrum ROM: Routine at 33A2

The address of this routine is found in the table of addresses. It is called via the calculator literal +3B by the routine at S_LETTER.

This subroutine is only called from 2757 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 +3B by the routine at S_LETTER. This subroutine is only called from 2757 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	33A2	POP AF	Discard the RE_ENTRY address.
	33A3	LD A,($5C67)	Transfer the offset from BREG to A.
	33A6	EXX	Enter the alternate register set.
	33A7	JR SCAN_ENT	Jump back to find the required address; stack the RE_ENTRY address and jump to the subroutine for the operation.