h3	Syntax variants

p	zasm supports different syntax for some opcodes:

pre	ex	hl,de		ex	de,hl
	ex 	(sp),RR		ex 	RR,(sp)		RR = hl, ix, iy
	jp	(RR)		jp	RR
	in	R,(c) 		in	R,(bc)
	out	(c),R		out	(bc),R		R = b c d e h l (hl) a
	in	a,(N)		in a,N
	out (N),a		out N,A
	rst	0			rst	0
	rst	1			rst	8
	rst	2			rst	16
	rst	3			rst	24
	rst	4			rst	32
	rst	5			rst	40
	rst	6			rst	48
	rst	7			rst	56
	add a,R			add	R			R = b c d e h l (hl) a
	adc a,R     	adc	R				and (ix+dis) (iy+dis)
	sub a,R			sub	R
	sbc a,R			sbc	R
	and a,R      	and	R
	xor a,R			xor	R
	or  a,R         or	R
	cp  a,R         cp	R

p	Some variants apply to notation for arguments:

pre	ld	a,N			ld 	a,#N
	ld	a,(ix+0)	ld	a,(ix)
	ld	a,(ix+dis)	ld	a,dis(ix)

p	Beyond that, zasm provides convenience definitions for compound instructions to increase readability and maintainability by reducing the number of lines in a source files.