Here is the bulk of a message I sent out to CSRG back when they first got
some 300s in 1990.  Might be useful for people.  Maybe someone can update
it with the later machines...
----
Here is the HP9000 series as I know it (as of April 1990 that is):

1. Buses:

DIO-I:	16-bit wide, 16Mb (24-bit) address space bus which supports the bulk
	of HP's controllers: HP-IB adaptor, SCSI host adaptor, serial
	interfaces and some older graphics interfaces.

DIO-II:	32-bit wide, 4Gb (32-bit) address space bus which mostly supports
	graphics interfaces and the Human Interface Board (HIB, aka "IO card")
	which consists of LAN, fast HP-IB (or SCSI), DMA, RS232, HIL, and
	internal HP-IB.

HP-IB:	HP's implementation of IEEE 488.1.  Supports a variety of HP
	peripherals including disks, tapes, printers and plotters.  Each
	HP-IB can have up to 8 slaves.  Comes in two flavors:

	1. Slow or standard speed (aka the "internal" HPIB):
	   300KB/sec (DMA) and 50KB/sec (non-DMA) max.  For
	   low-bandwidth peripherals like instrument controllers
	   and printers/plotters.  There is one of these (the internal
	   HP-IB) on every model machine I know of plus there is
	   a DIO-I card version.

	2. Fast or high speed:
	   1.2MB/sec (DMA) and 50KB/sec (non-DMA) max.  For high
	   speed devices like disks and tapes.  Comes as either
	   a DIO-II "daughter" board or a DIO-I plug-in card.

	A single system can have one "internal", one daughter board
	and any number of DIO-I style HP-IB interfaces.

SCSI:	Single-ended sync/async SCSI-I (I think) implementation.
	Each SCSI bus can have up to 8 "slaves", 1 of which (slave 7)
	is the controller (host-adaptor) itself.  Again, there are
	two variations:

	1. DIO-II "daughter" board:
	   1.5MB/sec (async) and 4.0MB/sec (sync) max.  Max of
	   one such interface per machine since it is a bolt-on
	   board that connects directly to the HIB.

	2. DIO-I plug-in card:
	   1.5MB/sec (async) and 2.67MB/sec (sync) max.  Can have
	   more than one of these depending on how many DIO slots
	   there are.

VME:	VME C.1 implementation.
	Don't know much about this, even though we have a couple.  Haven't
	done any support for the interface, not even sure it needs any.
	I think Van can tell you more about the limitations of this.
	There is an expander box version with 4 VME C.1 slots or there is
	a DIO card plus VME C.1 interface card for connecting to an
	external card-cage.  HP only has one VME card product, an SNA
	interface.

HIL:	Human Interface Link.  This is the "bus" that the graphical input
	devices	(e.g. keyboard, mouse, knobs, tablet, buttons) sit on.
	One HIL "loop" can hold up to 7 devices.  We only support one
	HIL.

2. Machines (in rough order of introduction):

310:	Obsolete.  10Mhz 68010 CPU based machine, don't know what MMU.
	We have never supported these in BSD.  About 0.7 of a VAX 780 based
	on dhrystone 1.1.

320:	Obsolete.  16Mhz 68020 CPU + 16Mhz 68881 FPU + HP proprietary MMU +
	16k VAC.  Holds 1-8Mb of RAM.  Has DIO-I bus, which memory and
	all interfaces sit on.  Can add additional slots via DIO "expander"
	box.  We support these because we have lots of them.  ~1.5 x VAX 780.

350:	Obsolete.  25Mhz 68020 + 20Mhz 68881 + HP MMU + 32k VAC.
	Holds 8-48Mb of RAM.  Has DIO-II bus supporting HIB and graphics
	interface.  Additional DIO-I and DIO-II slots available via expander
	boxes.  Has private CPU/memory bus.  Software identical to 320
	except supports 32-bit DMA transfers (320 only does 8 and 16).
	Supported cuz we have em.  ~3.4 x VAX 780.

330:	Obsolete.  16Mhz 68020 + 16Mhz 68881 + ??Mhz 68851 Motorola MMU.
	Has 4Mb of RAM on CPU board.  Has DIO-II bus with two available
	slots (which can be converted to DIO slots), cannot add expander
	boxes.  Support was added long ago because U. Wisc had them and
	loaned us one.  ~1.5 x VAX 780.

318
319:	Obsolete.  16Mhz 68020 + 16Mhz 68881 + ??Mhz 68851 Motorola MMU.
	Low-cost, single-board version of 330.  318 is monochrome, 319
	is 6-bit color.  Non-expandable (or upgradable) in any way.  I
	think we borrowed a 318 once to make sure it worked (which it
	did since it is software-identical to 330).  ~1.5 x VAX 780.

370:	33Mhz 68030 (includes MMU) + 33Mhz 68882 FPU + 64k PAC.
	Single, CPU board upgrade of the 350, same memory.  These are our
	workhorse machines (e.g. jaguar) right now.  ~5.7 x VAX 780.

360:	25Mhz 68030 + 25Mhz 68882.
	The 68030 equivalent of the 330; i.e. semi-expandable.  Holds
	4-16Mb of RAM which is tightly coupled to the CPU (i.e. not the
	same RAM as in the 350/370).  Supported, we have one of them.
	Software-identical to 370 except no cache.  ~3.9 x VAX 780.

340:	16Mhz 68030 + 16Mhz 68882.
	Low-cost, single-board version of 360 (though with different memory).
	4-16Mb of RAM.  Has one extra DIO-II slot.  Intended primarily as
	a diskless workstation.  Supported, we have a few of these.
	Software-identical to 360.  ~2.8 x VAX 780.

332:	16Mhz 68030 + optional 16Mhz 68882.
	Upgrade to 310, don't know much about it.  Not sold in a workstation
	configuration.  1-8Mb of RAM on private bus.  Has DIO-I slots and
	accepts DIO-I expander box.  Not supported, we have never seen one.
	Wouldn't immediately work since we assume an FPU.  Should be about
	2.8 x VAX 780.

375:	50Mhz 68030 + 50Mhz 68882 + 32k PAC.
	Multi-board upgrade of 370.  8-32Mb of RAM (different than 370)
	in 8Mb increments.  Multi-board SPU includes CPU, memory, SCSI,
	DMA, LAN, RS232, HIL, slow HP-IB and Centronics parallel interfaces.
	Has two available DIO-II slots (convertable to DIO-I slots) and
	can accept expander boxes.  CPU/FPU sit on a socketed "mezzanine"
	board that can be replaced by a 68040 chip later this year.  We
	will have several of these, support has just been added.
	~7.8 x VAX 780.

345:	50Mhz 68030 + 50Mhz 68882 + 32k PAC.
	Non-expandable version of 375.  Well, almost.  It only goes
	from 4-16Mb of RAM in 4Mb increments (the 4Mb boards can be
	used in 375s, but the 8Mb boards cannot be used in the 345s?)
	Not upgradable to 68040.  ~7.8 x VAX 780.

380(?):	25Mhz 68040 (includes FPU and MMU) + 32k PAC.
	Guessing here, don't know what it will be called or whether it
	will have a cache.  375 Upgrade is supposed to be available at
	no more than $2000 but is not yet on the price list.  Would hope
	that they will introduce higher capacity memory boards, 32mb
	(4 x 8mb modules) is not very much for their high-end 68k box.
	Of course, only Donald Trump could afford to buy more than a
	Mb or two anyway...

3. Kernel config "cpu" types (ifdefs):

310 and 332 are not supported.

HP320:	Includes HP MMU, old 16-bit only DMA, VAC support.
HP330:	Motorola 68851 MMU support.
HP350:	Always together with 320 except with newer 32-bit DMA support.
HP360:	Together with 330 for MMU support (68030 MMU is subset of 68851),
	also some kludgy support for DIO-II graphics display.
HP370:	Always together with 360 except for additional PAC support.

HP330 should be defined for 318/319 support.
HP370 should be defined for 345/375 support.