I'm always on the lookout for old calculators, especially those
built by Hewlett-Packard as well as programmable and scientific models.
Instruction manuals, service guides, sales literature and any other related documentation is also of interest. A nearly complete list of calculators in my collection can be found here. Working models are always welcome, but I also try to find broken and incomplete units to use as a source of parts for repair.
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If you have an old calculator in a desk drawer or stored away somewhere,
and it's made by H-P or it has an LED, nixie, or vacuum-florescent display,
I'm sure I'd be interested in it!
Besides those general guidelines, there are a few specific calculators I'm particularly interested in:
I'd also be interested in seeing a TI-71 clock. I can be reached via e-mail by clicking here.
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Hewlett-Packard's first programmable calculator,
the 9100A, was introduced in
1968. HP soon released an updated model, the
9100B. A number of peripheral devices were also manufactured,
including a plotter (9125A) and card readers (9150A and 9160A).
The Model 30 (HP 9830, 9830A, 9830B) actually came out of
the Calculator Division (eventually renamed to Desktop Computer Division) of
Hewlett-Packard in the 1970's.
First introduced in 1972, it was programmed in BASIC and had a number of
accessories that could be attached by way of interface "boxes" inserted
into the back of the machine.
More than 30 years ago Hewlett-Packard sold a series of
multi-user computers that could run several different
operating systems. The early machines, models 2114, 2115
and 2116 were eventually superceeded by the 2100A and 2100S.
Further refinements led to the 21MX.
Heathkit produced several different computer systems over
the years, but this one is really interesting. It's essentially
a Digital Equipment Corporation (DEC) PDP-11/03 with some
Heath-specific modifications.
I'm interested in acquiring old Heathkit digital clocks,
particularly the models with the orange Panaplex displays like
the GC-1005, GC-1092A, GC-1092D and GC-1094.
These are six-digit clocks
(hours, minutes and seconds) in either wood grain or plastic
cases with various alarm functions. The GC-1092D has a date
function as well. The 
Comsistent with the clock and timekeeping theme, I'm interested in early
digital stopwatches that use LED (or older technology).
I'm interested in older clocks, including digital timekeeping devices like
the HP 2509A Digital Clock.
I'm looking for an old Texas Instruments (TI) watch, a TI-500.
This is a mid-1970's era wristwatch that displayed the time using
four red LED's when a button was pushed.
I'm interested in acquiring old cryptographic equipment,
including the M-94 (CSP-885 wheel cipher device),
Hagelin M-209 or M-209-A (CSP-1500 mechanical crypto device),
Lorenz SZ 40/42,
M-138A (CSP-845 strip cipher) or Enigma machines.
I'm looking for a power supply for a TI SR-22 calculator,
model number AC 9222. It provides 5.8 volts DC at 1.2 amps
from a 120 volt AC source.
I have a Howard Miller Clock that's in really nice shape
except the clock doesn't work. Putting in a fresh battery
causes the second hand to move forward correctly but the
minutes and hours hands don't progress.
I'm looking for a Heathkit SB650 digital frequency display,
an add-on device to show the tuned frequency of a receiver
using Nixie tubes.
I'm looking for an AMC Gremlin X automobile.
I'd like it to have a V-8 engine and a manual transmission.
It also needs to be in reasonably good shape and ready
to drive -- I'm not interested in a "project" car.
While on the subject of cars, I'm also interested in buying
a restored AMC AMX, a two-seat sports car built between 1968 and 1970.
The HP 98155A is a keyboard that works with the HP 9915
industrial computer. I have a computer that needs such
a keyboard.
I'm looking for an AC adapter for an Epson HX-20 laptop computer.
According to the label on the back of the computer I need model
number H00AAA.
I recently purchased a used Yaesu FT-470 handheld transceiver but
I need a charger for it, maybe an NC-37 Drop-in Quick Charger or
a PA-6 Battery Eliminator. Any leads on a good place to get one?
I have a Mastercrafters 191 clock that needs a new plastic dome cover.
It's a neat 24-hour motorized analog clock, but the former owner used
a permanent red marker to note 4-hour intervals. I tried a couple of
different cleaning methods (Goo Gone, etc.) but didn't have much success.
The cover also has a few scratches on it, so either a replacement
or a good way to clean and smooth the existing one would be welcome.
I have a Boris Electronic Chess Computer without an AC adapter,
so I'm interested in locating a power supply, or at least the
proper polarity and voltage.
I have a Heathkit IM-13 and an IM-28 vacuum tube voltmeter (VTVM) but
both of them came without a probe.
)
I have an early electronic digital desk clock built by
ESE Enterprises in
El Segundo, California. It's model ES-10 and has the word
"Digitime" on the front panel. It's built into a wooden box
with a two-prong (no ground) AC cord.
An ESE (E.S. Enterprises) sales brochure from 1973 doesn't show
the ES-10, so it's
either an earlier product that was discontinued, or it was introduced
after 1973. The
closest device in the brochure is an ES 112 Digital Clock, which
shows hours, minutes and seconds and has three controls (fast
advance, slow advance, and hold) for setting the time. ESE also
offered a kit version of this clock as well as a twenty-four hour
model (the ES 124).
I have a Monsanto 100C Counter/Timer but
I don't have a manual for it.
Binary Arithmetic Subroutines for the CDP1802 COSMAC Microprocessor, RCA 
