Tony Duell sent me the pinouts for the 9915A/B keyboard and control connectors.

The keyboard connector is:

        1 : Shield      14 : C0
        2 : R0          15 : C1
        3 : R1          16 : C2
        4 : R2          17 : C3
        5 : R3          18 : C4
        6 : R4          19 : C5
        7 : Ground      20 : C6
        8 : Ground      21 : C7
        9 : R5          22 : Shift/
        10 : R6         23 : Ctrl/
        11 : R7         24 : Capslock/
        12 : R8         25 : Speaker
        13 : R9

The keyboard matrix is the same as the 85, and is connected between
the row (Rn) and column (Cn) lines The shift, control, and capslock
keys are connected between the appropriate pin and ground. The
speaker is an 8 ohm unit, connected between pin 25 and ground.

The Control connector, a DA15, has the following pinout :

        1 : LED0         9 : Run/
        2 : LED1        10 : Test
        3 : LED2        11 : Power OK
        4 : LED3        12 : Ground
        5 : LED4        13 : StartSw/
        6 : LED5        14 : TestSw/
        7 : LED6        15 : Shield
        8 : LED7

It basically carries the signals used on the front panel PCB. LEDn
are the 8 user-definable LEDs. Run and Test are the signals for the
2 LEDs with those labels on the panel (note that one seems to be
inverted, the other isn't!). The 2 switch signals correspond to the
run and test switches on the panel -- the external switches go
between those signals and ground.

You can turn on these LEDs with the SLITE(A,B) command (where A is
a mask identifying the LEDs that should be controlled and B is the
action, 1 for ON, -1 for OFF).

The 4 function keys on the left of the front panel are just the
user definable keys on the HP85, and appear in the keyboard matrix
as you'd expect.

The video connector is composite monochrome video at (US) TV scan
rates. Just about any composite mono monitor will work.

-------------------------------------


I got the following info from rigdonj@cfl.rr.com ages ago. There
were one or two minnor mistakes in the table which I corrected.

Enjoy:

98155A Keyboard Matrix

Everything in caps is as it appears on the keyboard. Names that are
too long are abbreviated and shown in lower case. A list of the
abbreviations and their meanings is also shown below.

pin |   21      20      19      18      17      16      15      14
----+--------------------------------------------------------------
2   |   nu      kl      K1      K2      K3      K4      ua      da
3   |   1       2       3       4       5       6       7       8
4   |   Q       W       E       R       T       Y       U       I
5   |   A       S       D       F       G       H       J       K
6   |   sb      Z       X       C       V       B       N       M
13  |   nu      nu      -l      rd      -CHAR   REP     ->      <-
12  |   nu      RESET   bs      nu      =       -       0       9
11  |   nu      nu      nu      sca     )       (       P       O
10  |   nu      nu      nu      nu      el      '       ;       L
9   |   nu      nu      nu      RUN     PAUSE   ?       >       <

Abbreviations:

    * nu = not used
    * da = down arrow (up and down arrow are used to recall previous
      commands and for editing)
    * ua = up arrow
    * rd = roll down (key to allow screen roll up/down)
    * kl = Key Label
    * el = End Line (this is what HP uses for carriage return/Enter)
    * sb = space bar
    * bs = Back Space
    * -l = -Line (erases the entire line)
    * sca = Scratch (erases all memory, just variables, etc depending
      on what argument you give it) 

Notes: The K keys are programable function keys. K5 through K8 are
K1 through K4 shifted. You can assign programs or functions to these
keys and use the Control input lines to trigger the program or
function. The -Char key erases one character at a time. the REP key
toggles between the insert and replace modes.

There are a few more keys that don't fit into a matrix. Here's a
list of them and the two pins that they connect to:

    * Both SHIFT keys are tied together in parallel and connct to pins 18 and 7.

    * There is a 8 Ohm .2Watt speaker inside. It connects to pins 25 and 7.

    * CNTL key connects to pins 23 and 7.

    * CAPS LOCK key connects to pins 24 and 7.