Tony Duell wrote:
98626A RS-232 Serial Port (DIO-I ?) card
The backplane has what appears to be a DIO-I adapter fitted for the top
slot of the backplane, with two card edge connectors - one impossibly
close to the top, you'd only ever fit one card.
The standard DIO backplanes on HP9000/200 machines have twice ans many
connectors as spaces for connector panels. The idea is that the 'hidden
slots' canbe used for options that don't need connectors -- RAM, ROM
(BASIC, HPL, etc), bubble memory, DMA, floating point, and so on. Some of
the 9000/200 video cards are 2 PCBs, one with a bracket (with the video
output socket), the other which fits in the hidden slot immediately above it.
I wonder if that's what you have. Many of the internal-only options
wouldn't be applicale to a 9000/300 machine, but the bubble memory card
should work, for example.
The 98626 is a
fairly simple RS232 port based, oddly, on the 8250 chip.
The 50 pin connector is a stnadard-for-HP pinout, [...]
At the moment I don't need to fuss with it, as there's a 16550 on the
Serial portd are always useful.
system board with what looks like a standard
"DB9" connector. But thanks
for the info, it may come in handy later.
I've made up my own cables for these ports (the same connector/pinout is
used on the uilt-in RS232 port of the HP9816 and HP9817). If you need it,
I can dig out the wirelist.
HP-HIL keyboard (courtesy Weirdstuff Warehouse)
The internals of that keyoard are a little strage.
Hopefully it will turn out to be a working example, and I won't need to
open it up! I remembered quite liking the keyboard from an HP 700/22
That's no excuse. Ecerything needs to be taken apart :-)
terminal many years ago, but don't especially care
for this one. The
keys are very loose and wiggle around / rotate on the mechanism, and the
pitch/width of the keycaps seems to be enough smaller than my Thinkpad
keyboards that I'll be fumbling a lot.
I know there are converters to allow the use of standard keyboards and
mice, but at the moment I'm thinking of sticking with more-or-less stock
parts. Just wondering if there are other HIL keyboard options.
There's the HP46020 keyboard. It looks much the same, and has the same
size/layout of keycaps, but it's different internally. It uses mechanical
keyswticehs soldered to a PCB, the circuitry is a mask-programmed COP400
microcontroller, the HP-HIL slave chip and a couple of 4000-series logic
chips. The feel is somewhat different to the 46021, I think the older one
There are other HP-HIL keyboards with, IIRC, fewer keys. The Integral has
one that stores on the front of the machine. AFAIK it'll work with other
HP-HIL machines (it does, however, send back a different ID byte) -- the
46020/1 keyboards work on the Integral. This one has much the same
mechanical design (and size/feel) as the 46020.
There's also a rare version of one of the compact keyboards used with the
9816, but with an HP-HIL interface not the custom one for the 9816. I
have never seen this one, though.
If oyu are desperate, yuo could try using the electronics of the 46020
with another matrix of switches with a feel/spacing that you like. Alas
the encoder and switches of that keyboard are all on one PCB, so you'd
either have to desolder the HP-HIL chip and microcontroller and wire them
up with the rest of the circuitry on a new PCB, or you'd have to cut the
original board to separate the switch area from the electronics.
I've never found any data on the HP-HIL slave chip. It seems to have an
SPI-like interface to the COP, but I have no idea what the regiters, etc,