YM_CLASS_TOP       61 dev/isa/ymvar.h #define YM_INPUT_CLASS		(YM_CLASS_TOP + 0)
YM_CLASS_TOP       62 dev/isa/ymvar.h #define YM_RECORD_CLASS		(YM_CLASS_TOP + 1) 
YM_CLASS_TOP       63 dev/isa/ymvar.h #define YM_OUTPUT_CLASS		(YM_CLASS_TOP + 2)
YM_CLASS_TOP       64 dev/isa/ymvar.h #define YM_MONITOR_CLASS	(YM_CLASS_TOP + 3)
YM_CLASS_TOP       65 dev/isa/ymvar.h #define YM_EQ_CLASS		(YM_CLASS_TOP + 4)