HP 9000 520

From: Joe <rigdonj_at_intellistar.net>
Date: Mon Apr 9 15:00:04 2001

At 07:22 PM 4/8/01 +0100, Tony wrote:
>> Most of the HP 98xx series machines have cartridge ports in the front.
>> Does it have a monitor? Then it's probably a 9835A or a 9845 (the 9835B has
>> a single line LED display). The 9835 is slightly larger than a Commie 64.
>> The 9845 is much larger. The 9020 doesn't have any cartridge ports. If it
>> has cartridge ports in the rear then it could be a HP 85 (small built in
>> CRT) or a HP 86 or 87 (external monitor).
>
>A few minor corrections, and machines you didn't mention :
>
>The HP9815 doesn't have cartridge ports on the front (it has 2 expansion
>slots on the back which (electrically) could take expansion ROMs or I/O
>devices - I have no idea what HP designed to go there.
>
>The 9825 has the same 4 ports on the front as the 9835, etc.
>
>The 9810 has 3 cartridge ports inside IIRC. I would have guessed the 9820
>did as well, but I've never seen that machine.
>
>The HP87 has an internal monitor (or at least mine does). It's a strange
>'widescreen' CRT -- about the width you'd expect for a small mono monitor
>(it will display 80 columns of text), but about half the height. %deity
>knows where I'd get a replacement CRT if it ever fails. The HP86 does use
>an external (composite mono) monitor, though.
>
>
   You are right but I was trying to keep it brief that's why I said "most"
of the 98xx machines. My statement about the HP 87 using an external CRT
was blatantly wrong.

   OK here's some more: The 9820 and 9821 have 3 ROM sockets on the top
left and directly behind the keyboard. The 9810 and 9830 have ROM sockets
inside. The 9831s and some of the 9825s have a pull out drawer in the RH
side. The drawer holds the OS ROMs. There are four sockets for expansion
ROMs along the front edge. The HP 85, 86, 87 and 9915 have four slots in
the back that can hold either interfaces or ROM drawers. Each ROM drawer
can hold up to six ROMs. The 9915 also has internal ROM sockets. The 9845
has pull out ROM drawers in both sides. Each drawer can hold up to 6 plug
in ROMs.

>The HP9815 doesn't have cartridge ports on the front (it has 2 expansion
>slots on the back which (electrically) could take expansion ROMs or I/O
>devices - I have no idea what HP designed to go there.

   The two expansion slots were optional on the early 9815 "A" models but
were standard on the later "S" model. There are several interfaces that can
go in those slots. Here's the list of the ones that I know of:


HP 98130A is used for the 9872 plotter.
HP 98131A is used for the 9871 impact character printer.
HP 98132A is used for the 9862 plotter
98133A is used for 9 digit BCD input and 8 bit parallel output.
98134A is used for bi-directional 8 bit parallel I/O and can be used to
connect the 9815 to other systems.
98135A is used to connect up to 14 HP-IB devices and has no interrupt
capability.
98136A is used for RS-232 or current loop serial communications.

    AFIK there were no plug in ROMs available for the 9815.

   Joe



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Received on Mon Apr 09 2001 - 15:00:04 BST