[comp.sys.hp] 9816 backplane info, 68881 i/f location

idh@nabla.electrical-engineering.umist.ac.uk (Ian D Hawkins) (03/27/91)

It seems impossible to get schematics or details of the backplane used in
the old 9816 machines.  Could somone suggest where I could find details of
(functional description , timing, pin out) of the backplane of this machine.
Where is the 68881 interface address?.  Has the memory map been published
anywhere ?.   Has anyone heard of a publication called 'Bench Notes' in which
a component level schematic apparently appeared ?.  Can one 'peek and poke'
bytes to specific locations in memory using rocky mountain
basic ?.   Is there a cross reference listing of hp part
numbers vs real world part numbers published anywhere.?.  Has
anyone hacked hardware in this device ?.  Comments,
suggestions or general help welcome on all points!.
                                        Ian H.

steve-t@hpfcso.FC.HP.COM (Steve Taylor) (03/30/91)

/comp.sys.hp/ idh@nabla.electrical-engineering.umist.ac.uk (Ian D Hawkins) //
| It seems impossible to get schematics or details of the backplane used in
| the old 9816 machines.  Could somone suggest where I could find details of
| (functional description , timing, pin out) of the backplane of this machine.
Sounds like you need:
	HP 98630-90001:  _HP 98630 Breadboard Interface Installation and
			  Programming_
This includes a schematic for the breadboard card and other information of
possible use.  Also:
	HP 09800-90011:  _Accessory Development Guide for HP 9000 Series
			  200/300 Computers_
This manual appears to be a fairly complete description of the DIO bus.
I think this is the backplane description you want.  One more item, which
won't be needed with a 9816, but which I list for completeness sake:
	HP 98562-90010:  _DIO II Accessory Development Guide for HP 9000
			  Models 330/350 Computers_
I don't know if these manuals are still available.

| Where is the 68881 interface address?.
There is no 68881 in a 9816.  That came later.

| Has the memory map been published anywhere ?.
You'll find some of that in the manuals listed above.

| Has anyone heard of a publication called 'Bench Notes' in which
| a component level schematic apparently appeared ?.
I think that's service notes for the HP repair people, but I haven't seen
one since 9835/45 days.

| Can one 'peek and poke' bytes to specific locations in memory using
| rocky mountain basic ?.
Yes.  This was first documented in the 5.0/5.1 manuals, but has been in
the language from the beginning.  See READIO/WRITEIO in the _BASIC 5.0/5.1
Language Reference_ (HP 98613-90052).
						Regards, Steve taylor

NOT A STATEMENT, OFFICIAL OR OTHERWISE, OF THE HEWLETT-PACKARD COMPANY.