*20
	MAINDEC-12-D1DA
	 
	PDP-12 CHECKERBOARD
	 
	OCT 20 1969
	 
	ST PROC
	RSW9-11 SET TO AMOUNT OF MEMORY AVAILABLE IN 1K SEG
	8-MODE
	IO PRESET
	START 20
	 
	SW SET
	SR00=1 SUPPRESS ERR HLT
	SR01=1 SUPPRESS PRINTOUT
	SR02=1 SCOPE LOOP ON FAILING CELL
	SR03=1 LOOP ON SELECTED FIELD