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.

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: Casio fx-201P, fx-202P Commodore 207CB, M55 Corvus 305 Hewlett-Packard HP-10, HP-19C, HP-29C, HP-46, HP-55, HP-70, HP-81 Texas Instruments SR-22, SR-60, TI-150, TI-3510, TI-450 I would also be interested in seeing a TI-70 and/or TI-71 clock. I can be reached via e-mail by clicking here.

• COMX 35
• Digital Equipment Corporation (DEC) trainer using μ-T/11 (micro-T/11)
• IMSAI 8048 microcomputer board (more info)
• KIM-1 and SYM-1
• Multitech Micro-Professor
• National Semiconductor Pacer
• Netronics ELF and ELF-II microcomputers (more info)
• Protec PRO-83
• RCA COSMAC and Quest ELF (more info)
• Rockwell AIM-65 (photo)
• Signetics Instructor 50 (more info)
• Other single-board microprocessor trainers from the 1970's and 1980's

You can see a more comprehensive list of machines I'd like to rescue here.

I'm interested in the machines, peripherals, documentation, manuals, advertisements and any other related materials. If you have any of this, or know someone who does, please send me an e-mail!

You can read more about these machines here.

I have more information about the machine here. including scans of a four-page technical data brochure.

I wrote a number of programs for the 9830 and the 9831, back in in the 1979-1982 timeframe. (Click here for more information on the 9831.)

I am also interested in peripherals for the 9830, especially mass storage devices like the 9880A and 9880B removable hard disk drives and the 9867B removable/fixed hard disk drive. The 9880B has two hard drive platters, one permanently installed and the other a removable platter (HP 12869A). Each platter has a storage capacity of 2.4 megabytes. The drive interfaces with the 9830 via a HP 11273B Plug-in ROM block and an HP 11305A Controller.

I would especially like to find a Data Communications Interface for the 9830, specifically the 11205A or 11285A. A couple of plug-in ROMs for the 9830, the 11296B and 11298B for Data Communications, provide the 9830 with the capability of communicating with external serial devices. I'd also like the interface cables, like the 11284A Data Communications Interface.

I would also like to find an HP 2615 terminal (actually a Beehive MiniBee) and a HP 9882A terminal, which is an HP 2640A terminal and an interface card to connect it to a 9830.

Plug-in interfaces are also of interest, including the HP 59405A HP-IB Calculator Interface Unit.

In case you're interested, the 9830 is covered in great detail in U.S. Patent number 4,012,725. (In addition, the 9810 is in patent 3,859,635 and the 9820 is in 3,839,630, which are also very interesting reading.)

Click here for more patent listings.

HP 9100 (9100A, 9100B) HP 9805 (9805A) (Click here for an advertisement [Large]) HP 9810 (9810A) HP 9815 (9815A, 9815A/S, 9815S) HP 9820 (9820A) and HP 9821 (9821A) HP 9825 (9825A, 9825B, 9825T) HP 9830 (9830A, 9830B) HP 9831 (9831A) (Also part of the 9896 Computation System) HP 9835 (9835A, 9835B) System 35 (Click here for a photo) HP 9845 (9845A, 9845B, 9845C) System 45

HP 9835A

HP 9020 (32-bit workstation) HP 120 (45500A) and HP 125 (45600A) HP 250 and 260

HP 250

You can see some print advertisements for some of these calculators and computers by clicking here.

As you can see, basically anything in the 9100 and 9800 series, and not just calculators -- peripherals, cables, ROMs, manuals, tapes and so on are also of keen interest.

Peripherals:

• 2748B Paper Tape Reader
• 2795B Tape Punch
• 2895B Paper Tape Punch

• 9860A Optical card reader
• 9861A Typewriter output
• 9862A Plotter
• 9863A Paper Tape Reader (click here for a Technical Data scan)
• 9864A Digitizer
• 9865A Tape cassette
• 9866A Thermal printer
• 9867B Removable/Fixed Hard Disc Drive
• 9868A I/O expander
• 9869A Hopper Card Reader (click here for a Technical Data scan)
• 9870A Card Reader (hand fed)
• 9871A Impact printer
• 9880A Mass Memory Storage (9880A, 9880B) (click here for a Technical Data scan)
• 9882A CRT Subsystem (HP 2640A terminal and 9830A Calculator Interface Card)
• 9883A High Speed Paper Tape Reader Subsystem
• 9884A Tape Punch Subsystem
• 9885M Flexible Disc Drive (Master, Slave and plug-in ROM)

• 11285A Data Communications Interface and ROM
• 11287A Line Printer Interface Card
• 11296A Interface Control ROM
• 11297B Binary Synchronous ROM
• 11298B Interactive ROM

Click here for more information on these interfaces.

• 11202A General I/O Interface Card (8-bit parallel)
• 11203A BCD Interface Card
• 11205A Serial Interface Card
• 11284A Interface Cable
• 11285A Data Communications Interface and ROM
• 11287A Line Printer Interface Card
• 11297B Binary Synchronous ROM
• 11298B Interactive ROM
• 98131A Printer interface card
• 98132A Plotter interface card
• 98133A BCD I/O card
• 98134A General I/O card
• 98135A HP-IB I/O card

I am interested in acquiring and restoring any of these machines, with an eye toward running Time Shared BASIC (TSB) on one of them. I'm also very interested in any manuals, documentation, and especially software (library tapes, punched paper tape, etc.) for this machine!

Peripherals are also welcome, such as the 2737A Punched Tape Reader, 2753A Tape Punch, 2761A card reader, and the 7261A Optical Mark Reader.

I'm also interested in finding an HP 12909A PROM Writer.

I have some pictures of various HP 2100 configurations here, along with further information and links.

I'd like to find the H-11, the H-10 paper tape reader/punch, and the H-27 floppy disk drive subsystem. An H-9 video terminal would also be welcome.

Leads on systems that are just gathering dust somewhere are welcome. I'll give it a good home!

I'm also interested in the H-8, which was an 8080-based computer with a front panel. It could also use the H9 terminal and H10 paper tape punch, but had an optional H-17 floppy disk drive as well. The H17 was a dual 5-1/4 inch subsystem.

You can see some scanned advertisements for this equipment here.

Click here to read a 1977 article about the introduction of the H8 and H11 computers, along with the H9 video terminal and the H10 paper tape reader/punch.

A good technical reference, besides the original Heathkit manuals, is a book written by John Lenk entitled How to Troubleshoot and Repair Microcomputers. Published in 1980, it devotes several chapters to the H11 computer, H9 video terminal and the H10 paper tape reader/punch.

A more informal review of the H-8 and H-9 can be found in the June 1978 issue of Interface Age in an article entitled A buyer's and builder's guide to the Heathkit H8 system. The article was reprinted in the book Personal Computing: Hardware and Software Basics published in 1979.

I am interested in preserving and restoring the following devices.

• GD-1090 Analog Thermometer
• ID-1290 Analog Weather Station (5-in-1)
• ID-1390 Digital Thermometer
• ID-1490 Digital Clock/Thermometer (click here for a catalog scan from 1977)
• ID-1590 Wind Speed and Direction Indicator
• ID-1790 Digital Rain Gauge
• ID-1795 Digital Rain Gauge
• ID-1890 Weather Station ("Digital Wind Computer")
• ID-1990 Digital Barometer
• ID-2090 Digital Barograph (more info)
• ID-2295 Digital Humidity Indicator
• ID-4001 Weather Station ("Digital Weather Computer")
• ID-5001 Weather Station ("Advanced Digital Weather Computer")
• EW-4100 Weather Course Book

I am also interested in locating sensors and temperature probes, especially for the ID-1490 and the ID-4001. Does anyone have a source for a replacement outdoor unit (wind speed and direction) for the ID-4001?

CRYPTOGRAPHIC EQUIPMENT

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. More on my cryptographic interests can be found here.

AST GRIDPAD 2390 CABLE, PEN AND MANUALS

I have an AST GRIDpad 2390 PDA but it's missing the pen (stylus) and the RS-232 cable. It also came without documentation of any kind. Does anyone know where I can find these items? I'm told this is the same device as the Tandy Zoomer and the Casio Z-7000.

OLD COMPUTER TERMINALS

I am interested in acquiring old computer terminals, especially the following models: Beehive Model I, II, III (Really, any Beehive terminal, especially a MiniBee.) Digital Equipment Corporation (DEC) VT-52 Digital Equipment Corporation (DEC) VT-100 Digital Equipment Corporation (DEC) VT-101 Heathkit H-9 Hewlett-Packard HP 2600A Hewlett-Packard HP 2615A Hewlett-Packard HP 2640A Hewlett-Packard HP 2647A Hewlett-Packard HP 2648A Click here for an advertisement from the August 1977 issue of Scientific American magazine. ITT Model 3501 Asciscope I wrote a few programs using the ITT ASCIscope back around 1980 and would like to find one again. I used it to dial up to an HP 2000 Access computer system. More photos can be found here. Lear Siegler ADM 3A Lear Siegler ADM 5 The ADM-3 and ADM-3A terminals were sold in both kit and assembled form and were perceived as a great improvement over the older, mechanical Teletype machines typically used as computer interfaces. You can see a write-up about the kit here. Lear Siegler ADM 5 Televideo 910 Televideo 912 Data General Dasher 100 Data General Dasher 200

TEXAS INSTRUMENTS AC ADAPTER AC9222

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.

HEATHKIT IC-2009 CALCULATOR POWER SUPPLY

I have a Heathkit IC-2009 calculator (an early LED design) but I need the two-prong power supply to charge the internal Nickel-Cadmium batteries.

HEATHKIT PARTS

I have several Heathkit devices that are in need of repair or need additional parts, including: GC-1000 I'm looking for a replacement Mostek 3870 CPU, Heathkit part number 444-293-1. This is a 40-pin DIP microprocessor pre-programmed for this clock. Does anyone know of any sources for this old chip? ID-1390 I'm missing the temperature probes for a Heathkit ID-1390B digital thermometer. These probes are a matched pair of 1N4149 diodes (Heathkit part number, I think, is either 100-1657 or 100-1711) sealed inside a little aluminum can with spade lug connectors on the other end of a connecting cable. GC-1107 I have a Heathkit digital clock, model number GC-1107. It seems to work fine and looks fairly good except that it's missing the faux wood trim plate on the front that says "Heathkit." It's also missing one rubber foot. (I have some other Heathkit manuals for sale or trade on my For Sale page.)

HEWLETT-PACKARD HP 970A PROBE MULTIMETER

I'd like to find a working HP 970A probe multimeter with a case and charger. This is a self-contained, battery powered handheld measurement device introduced by HP in 1974. Click here to see an ad for this device from the January 1974 issue of Scientific American magazine. Click here to read a review of the meter from the October 1973 issue of CQ magazine.

HEATHKIT SB-650 DIGITAL FREQUENCY DISPLAY

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. Click here for more information.

AMERICAN MOTOR COMPANY GREMLIN

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. It does not have to be green. Click here for more information.

AMERICAN MOTOR COMPANY AMX

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. Obviously this isn't quite in the same league as the Gremlin, but I'd welcome leads on a fully restored metallic or electric blue ("caravelle") AMX, like the one pictured here. You can read a test drive report on the AMX from racecar driver Mario Andretti by clicking here.

KEYBOARD FOR AMIGA 2000

I picked up an Amiga A2000 but it's the CPU only -- no manuals or documentation, and worst of all no keyboard. I'd like to power this thing up and check it out but I need the keyboard for the A2000.

HP 98155 A KEYBOARD

The HP 98155A is a keyboard that works with the HP 9915 industrial computer. I have a computer that needs such a keyboard. More information is available here. If you have one of these keyboards that you'd like to part with, please send me an e-mail!

AC ADAPTER FOR EPSON HX-20 COMPUTER

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. For more information on the HX-20, click here.

YAESU FT-470

I purchased a used Yaesu FT-470 handheld transceiver at an estate sale 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?

HEATH HW24HT

I have a Heath HW24HT handheld transceiver but it came without a charger, so I'm looking for the AC adapter. Any leads?

CONNECTOR FOR GPS CABLE

I have a couple of Motorola Remote GPS units (part number RWPRF12104) and am looking for the mating connector. The unit has a Deutsch MMP 21C-2212P1 locking connector, which has twelve pins. I'm looking for the connector that mates to this one. According to the Deutsch numbering scheme, I'm looking for a MMP 26C-2212S1. Apparently this is made up of a molded backshell (6810-204-2001) and a dozen sockets (6862-201-22278). Does anyone know of a current source for this connector?

BATTERY FOR MELCOR SC-650 CALCULATOR

This Melcor SC-650 scientific calculator uses a cylindrical rechargeable battery that needs to be replaced. The battery is labeled 12B012. Any ideas on where to find a replacement? Update: I received this recommendation: Hi, I have this calculator that I purchased sometime in the 1970's. Just today I pulled it out of the desk drawer and took the back off to see what type of batteries it had. The only thing I had to go on was the number on the pack (12B012). I did a Google search and came up with zilch; however, I slipped the pack out of the cylinder case and did some measurements. It appears that two NiCad size 4/5A cells would work since the size is identical. You would need two of these single cells and simply slip them into the Melcor outer case (in series) then place them into the calculator. I have not tried this yet, but I do intend to try it when I can get my hands on the 4/5A cells. Size, voltage etc. seem to be identical. An Internet search of 4/5A NiCad battery will bring up multiple sources of this cell.

BATTERY AND CHARGER FOR KINGS POINT SC-6010 CALCULATOR

I'm looking for an AC adapter (charger) and perhaps a replacement battery for this Kings Point SC-6010 scientific calculator. Of course, a manual would also be nice. Any ideas on where to locate accessories and spare parts?

POWER CONNECTOR FOR SYM-1

I have a Synertek SYM-1 development board but it's missing the power connector. You can see more photos of the SYM-1 and a pin-out for the board connectors here.

PROBE FOR HEATHKIT IM-28 VTVM

I have a Heathkit IM-13 and an IM-28 vacuum tube voltmeter (VTVM) but both of them came without a probe. Does anyone a spare probe, or a lead on where I could get one?

POWER SUPPLY FOR TANDY 1400HD LAPTOP

I have a Tandy 1400HD laptop but it's missing the AC adapter power supply. The Radio Shack website lists the battery as 4.8V 4400mAh Nickel-Cadmium and the AC adapter as Input: 105-135 AC 60Hz, Output: 12V 2.2A DC, Polarity: Center Positive Update: I received this e-mail in September 2002. Note the polarity data: FYI, the one in my hand is a 12V 2.2A positive tip. Cat. # 25-3505 Does anyone have a spare AC adapter they'd like to get rid of? (Click here for details on the 1400HD Setup utility.)