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From: <bogus_at_does.not.exist.com>
Date: Sun Feb 27 13:22:22 2005

Control Signals Interface:

Connector - 15 pin D-subminiature connector, female pin and straight plug body.

Cable length - 30 m, maximum load of 4000 pF capacitance as measured
        at any output pin.

Grounding - Separate signal ground and cable shield ground are provided.

Annunciator signals - Output lines, eight lines logically parallel to
        the front panel annunciators.

Run signal - Output, active high, logically parallel to the front
        panel RUN light.

SELF TEST signal - Output, active high, logically parallel to the front
        panel SELF TEST light.

Master reset signal - Output active low when:
        - Power off,
        - 9915A detects brown out,
        - AUTOSTART executed from front panel, software or operator interface
          input,
        - SELF TEST asserted from front panel or operator interface.

AUTOSTART initiate - Input active low, logically parallel to the front
        panel AUTOSTART key, buffered and debounced; a system master reset is
        initiated upon asserting a low input and autostart is initiated upon
        release of the asserted low input.

SELF TEST initiate - Input, active low, logically parallel to the front
        panel SELF TEST key, buffered and debounced; a system master reset is
        initiated upon asserting a low input and self test is initiated upon
        release of the asserted low input.

> >There is also a little board inside that has eight sockets, four of which
> >are populated with 2732 eproms. I am wondering whether this is part of the
> >cpu system, or if it is for embedded program storage like the programmable
> >rom card for the 85.

> The later. There were software development kits available that let you
> write programs in assembler and burn them into EPROMs that plugged into
> a HP-85 type plug-in cartridges (called a Hybrid ROM or something like
> that) or directly into the 9915. The EPROMs that are in it are
> probably Matrix and/or I/O ROM IIRC. That seems to be standard in the
> 9915s that I'm aware of.

The 9915 has sockets for two sets of ROMs: The EPROM card you mentioned
(which can accomodate up to 32K using 2516, 2716, or 2732 EPROMs) which
can store user application programs. The second set is a bank of 6
sockets for HP-85 ROM MODULES (white letters). These are the same modules
that plug into the HP Series 80 ROM drawer (HP 82936A). The default
configuration of the 9915 includes the 00085-15003 I/O ROM and the
98151A Program Development ROM (which contains instructions for controlling
the front panel LEDs and switches).

The second bank is located under the expansion card cage. You can
get to them by unscrewing one screw in the back of the 9915 (under
the bottom slot) and one on the Operator Interface card.

If you remove the expansion card cage and the EPROM card you may notice
that their connectors are identical (even the guides are in the same position).
Do not even think of exchanging them.

With just the I/O ROM even if you get an HP-IB card you will not be able
to use disks, you also need the 00085-15001 Mass Storage ROM for accessing
old-style Amigo drives or the (unobtainable) 00085-15013 EMS ROM that
allows access to the SS-80 drives (e.g. 9122, 9133D/H etc.).

Given the EPROM card, it may be easier to make a small ROM emulator board that
allows data to be uploaded via a serial interface.

BTW the keyboard also provides a speaker signal: unipolar output, 100ma
        +/- 20% into an 8 ohm load.

The keyboard is simply an 8 by 10 matrix buffered and debounced, and
provides 76 cross points. The shift, control and caps lock keys are provided
as dedicated lines.

Best Regards

**vp
Received on Sun Feb 27 2005 - 13:22:22 GMT