H89 CPU parts list ICs
  ___________________________________________________________________________
      U Number	     Heath Number    Generic Number	Special function
  ---------------------------------------------------------------------------
	U501		443-18		7404
	U502		443-34		7492
	U503		443-760		CD4040
	U504		443-881		Z80
*4	U506		443-730		74LS74
	U507		443-727		96L02
*3	U508		443-824		74LS241
	U509		443-824		74LS241
*2	U510		443-837		74LS373
	U511		443-837		74LS373
	U512		443-730		74LS74
	U513		443-824		74LS241
	U514		443-824		74LS241
	U515		443-779		74LS02
	U516	PROM	444-41		74S188		Memory map
			444-9001
	U517	PROM	444-42
		0 ORG.	444-66		SN74S470	Memory map
	U518	PROM	444-40
		NEWEST	444-62	!	TMS 2716	Boot system
	U519		Not used
	U520	PROM	444-19		2716		Floppy controller
*2	U521		443-754		74LS240
	U522		Not used
*2	U523		443-764		2114		RAM (floppy)
	U524		Not used
	U525		443-764		2114		RAM (floppy)
*36	U526-U549
	+U1-U9	16K EXP	443-904		4116		RAM (main memory)
	U550	PROM	444-43
		NEWEST	444-61	!	SN74S470	I/O Map
	U551		443-791		74LS244
	U552		443-805		74LS273
	U553		443-875		74LS32
	U554		443-732		74LS30
	U555		443-730		74LS74
	U556		443-730		74LS74
	U557		443-912		74LS148
	U558		443-754		74LS240
	U559		443-794		1488
	U560		443-795		1489
	U561		443-874		8250		UART
	U562		443-901		74S132

	U565		442-664		79M12KC or 7912	Regulator
*3	U566		442-665		7905		Regulator
*2	U567		442-663		78M12 or 7812	Regulator
	U568		442-663		78M12 OR 7812	Regulator
	U569		442-665		7905		Regulator
	U11		442-665		7905		Regulator 16K board

* = First time number is listed shows total of that number used in CPU.

! = Newest PROM set must be used together, for correct I/O control.