PTR			=TEMP	;word
LEN			=TEMP+2	;word
NEXTSPR			=TEMP+4
SCRX			=TEMP+5
SCRY			=TEMP+6
SRC			=TEMP+7	;word
DST			=TEMP+9	;word

RLE_LOW			=TEMP
RLE_HIGH		=TEMP+1
RLE_TAG			=TEMP+2
RLE_BYTE		=TEMP+3