Address		Bytes	IY	Description
65008 FDF0	3	-26h	Clock
65011 FDF3	1	-23h	Current row
65012 FDF4	1	-22h	Current column
65013 FDF5	1	-21h	Bit 7 = keyflag
65031 FE07	1	-0Fh	Bit 7 = Ctrl-C flag
65034 FE0A	2	-0Ch	Device list
65036 FE0C	2	-0Ah	? - Set to 82h at 0A77h
65052 FE1C	2	+06h	BOFA
65054 FE1E	2	+08h	EOFA
65046 FE16	-	+00h	IY points here
65056 FE20	2	+0Ah	HEAP
65061 FE25	1	+0Fh	? - Set to 0 at 0091h, 0A70h
65063 FE27	2	+11h	Initial SP (DOSBUFs are above this)
65065 FE29	2	+13h	Variable list
65067 FE2B	1	+15h	Currently selected card (OUT 1,x)
65074 FE32	2	+1Ch	Open file list