Spectrum ROM: Routine at 1E85

1E85: THE 'TWO-PARAM' SUBROUTINE

Used by the routines at OUT_CMD and POKE. The topmost parameter on the calculator stack must be compressible into a single register. It is two's complemented if it is negative. The second parameter must be compressible into a register pair.
TWO_PARAM	1E85	CALL FP_TO_A	The parameter is fetched.
	1E88	JR C,REPORT_B_2	Give an error if it is too high a number.
	1E8A	JR Z,TWO_P_1	Jump forward with positive numbers but two's complement negative numbers.
	1E8C	NEG
TWO_P_1	1E8E	PUSH AF	Save the first parameter whilst the second is fetched.
	1E8F	CALL FIND_INT2	Save the first parameter whilst the second is fetched.
	1E92	POP AF	The first parameter is restored before returning.
	1E93	RET	The first parameter is restored before returning.