;
; trade de^ and hl^ for c bytes
; a,f
.mxchg::
	push	b
	push	d
	push	h
mxchg1:	mov	b,m
	ldax	d
	mov	m,a
	mov	a,b
	stax	d
	inx	d
	inx	h
	dcr	c
	jnz	mxchg1
	pop	h
	pop	d
	pop	b
	ret