Copy an 8x8 into a 19x19

chunk_copy:
	ld de,(map_buffer_cur)
	ld bc,8
.loop:
	push bc
	ld c,8
	ld ix,de
	ldir
	lea de,ix+19
	ex (sp),hl
	dec l
	ex (sp),hl
	pop bc
	ret z
	jr .loop