Elmo HARmonica, HARSFEN0602 software manual Spadd

	HARSFEN0602ElmoHARmonicaSoftwareManual					PRELIMINARYDRAFT
	Shift left the number below top of stack by the number at the top of stack.
	Algorithm:
	(SP-1) << (SP) (SP-1)
	SP	SP – 1
	Attributes
	Attribute			Value		Comment
	Op code					May change in future
						versions
	Number of arguments			None
	Argument types			N.A.		Both arguments types must
	→		→			be integer (set according to
						stack members flags)
	Addressing modes			Absent
	Promotion			N.A.
	Output type			Int << Int	Int
	Imposes end of line			No
7.7.35		SPADD

Purpose:
Increase or decrease stack pointer with the value given as an argument.
Algorithm:	→
SP SP + OP1
Attributes
Attribute	Value	Comment
Op code		May change in future
		versions
Number of arguments	1
Argument type	Signed char integer
Addressing modes	Immediate1
→
Promotion	N.A.
Output type	N.A.
Imposes end of line	No

7.7.36SUB - SUBTRACT

Purpose:
Subtraction of two numbers (top two entries at the stack) .
Algorithm:
(SP-1) - (SP) (SP-1)
SP	SP-1
Attributes
Attribute			Value	Comment
Op code				May change in future
				versions
Number of arguments			None
Argument types			N.A.	Both arguments types are set
→		→		according to stack members
				flags

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