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The Collector's Guide to Pocket Calculators lists over 1,500 models of early pocket calculators from over 220 companies.

If you have an early pocket calculator (from the 1970s with LED, vacuum fluorescent, discharge, or early LCD display, and battery powered) which is not in The Collector's Guide, please email the details as in the list below for inclusion here.

Details for each calculator are required in the format used in the book, and below:
Manufacturer or Trading Company, Model Name or Number (there may be more than one), Functions, Display Type, Battery type (and if rechargeable), Size, Country of Manufacture, any Interesting Features.

A small frontal photograph (jpeg format, about 600 pixels max dimension) of each would be useful and will be included with the details if of good quality.
Please email with details.

New Calculators

Latest Update - latest additions have the date added.

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T

Tabulex (Euro-market company. May have had a connection with Hanimex.)

• 666, 4-function, red LED, 4-AA rep. batt., 81x172x23mm / 3.2x6.8x0.9", Hong Kong, has membrane keyboard, c1973, (similar to Prinztronic C15). Photo. Sept. 04.
• 880, listed in book.
• delta, listed in book.
• gamma, 4 function, %, memory, red LED, 4- AAA rep batt, 2.2x4.75", Hong Kong, similar to Prinztronic M. Photo.
• P86, 4-function, %, red LED. Jan 07.

Taktile (Made in England - if you have any information about the company please get in touch)

• 1200, 4-function, red LED, membrane keyboard, same as Triton 1200. Featured British calculator.
• 2001M, 4-function, %, memory, red LED, membrane keyboard, resembles Triton models. Featured British calculator. Photo.

Tamaya (Japanese scientific instrument maker)

• NC2, listed in book.
• NC-77 Digital Navigation Computer, 4 function & navigation, 10 digits green fluorescent, 4- AA rep batt, 3.3x5.9", Japan. ~1977, comes with fitted wooden case. Photo . Featured calculator.

TC (probably not the name of the company. If you have any information please get in touch)

• TC-8M, 4-function, %, memory, green VFD. Photo.

Teal (T.E.A.L. stands for Tokyo Electron Applications Laboratory, of Tokyo, Japan, which made and sold calculators under the Teal name. Teal Industries Inc., of Carson, California, was the U.S. subsidiary. For more information see the Calculator Companies section).

• 8, 4-funct, red LED, sealed batt, 3.0x5.0", interesting case design, same case as Apollo II (NRC-9270), Japan.
• 110PD, listed in book.
• 806, listed in book.
• 813 4-funct, mem, %, sq rt, green fluor, 4-AA rep batt, 3.5x5.5", same case as Tokyo Electronic Applications Lab Technipet 813, Japan. Photo.
• 817, listed in book.
• 826, listed in book.
• K-80M, 4 function, 8 digits orange gas discharge in separate tubes, 4-C rep batt, 4.8x8.6", switches for constant and decimal place, battery meter, date unknown, country of manufacture not stated (Japan ?), similar to Xonex model. Photo.
• LE-8 President, 4 function, red LED, 6-AA rep batt, 74x142x31mm / 2.9x5.6x1.2", c1972, Japan, also found labelled as Geller Teal LE-8. Photo.
• SR82, listed in book.
• SR85, listed in book.
• Technipet TL813, listed in book.

Tealtronic (British marketing company, High Road, London N12)

• 4519, 4-function, %, memory, sq. rt., similar to Craig 4519.
• SM-8, 4 funct, %, mem, 8 digit green VFD, 4-AA rech batt, 155 x 71 x 33 mm / 6.1 x 2.8 x 1.3", c1973. Photo.
• TEM-28, listed in book.
• TEM-38, listed in book.
• TEM-48, listed in book.

TEC (Taihan Electric Wire Co., Ltd., Korea)

• TECCAL MINI-806, 4 function, 8 digit ref LED, Korea. Photo.

Technico

• Pocket Mini aka 6SL, 4 function, memory, %, 8 digit red LED, PP3 rep batt, 60x100x21mm / 4.8x8.6x0.8", country of manufacture unknown. Photo.

TEL

• Elektron Mark I, 4 function, %, 8 digit VFD tubes, 88x151x30mm / 3.5x5.9x1.2" c1973, Japan. Photo, inside. Sept. 04.

Texas Instruments (USA manufacturer) (See Larry Gilbert's article "Texas Instruments Calculators: 1972 - 1979 How rare are they?" on this site. There are details of all vintage Texas Instruments calculators at www.datamath.org)

• Able-IV, listed in book.
• Business Analyst aka TI Business Analyst, listed in book.
• Business Analyst I aka TI Business Analyst I, listed in book.
• Concept I, listed in book.
• Concept II, listed in book.
• Exactra 19 aka EX-19, listed in book.
• Exactra 20 aka TI-20 and EX-20, listed in book.
• Exactra 21 aka EX-21, listed in book.
• Exactra 22 aka EX-22, listed in book.
• Lady 1200, listed in book.
• Little Professor, listed in book.
• MBA, listed in book.
• Minimath 4-funct, early LCD, sealed batt, 3.0x5.5", made in summer 1972, apparently never commercially sold due to technical and manufacturing problems, USA. Photo.
• Money Manager, listed in book.
• Mr. Challenger, listed in book.
• Programmer, listed in book.
• Spelling B, listed in book.
• Spirit of '76 aka 76, listed in book.
• SR-10, listed in book. Photo. Featured calculator.
• SR-11, listed in book.
• SR-16, listed in book.
• SR-16 II, listed in book.
• SR-22, listed in book.
• SR-40, listed in book.
• SR-50, listed in book.
• SR-50A, listed in book.
• SR-51, listed in book. Photo.
• SR-51A, listed in book. Photo.
• SR-51-II, listed in book. Photo.
• SR-52, listed in book.
• SR-56 Programmable, listed in book.
• T-1220, listed in book.
• T-1225, listed in book.
• Tax Planner aka WG&G, listed in book.
• TI-20, listed in book.
• TI-30, listed in book. Featured calculator.
• TI-41, European model number of the Business Analyst. Photo.
• TI-51-III, listed in book. Photo.
• TI-55, listed in book.
• TI-57, listed in book. Photo.
• TI-58, listed in book. Featured calculator.
• TI-58C, listed in book.
• TI-59, listed in book.
• TI-150, listed in book.
• TI-1000, listed in book.
• TI-1025, listed in book.
• TI-1050, listed in book. Photo.
• TI-1200, listed in book. Photo.
• TI-1205, listed in book.
• TI-1220, listed in book.
• TI-1225, listed in book.
• TI-1250, listed in book. Photo.
• TI-1265, listed in book. Photo.
• TI-1270, listed in book.
• TI-1400, listed in book.
• TI-1450, listed in book.
• TI-1500, listed in book.
• TI-1600, listed in book.
• TI-1650, listed in book.
• TI-1680, listed in book.
• TI-2500 aka Datamath, listed in book. Featured calculator.
• TI-2500B, listed in book.
• TI-2500-II aka Datamath II, listed in book. Featured calculator.
• TI-2510, listed in book. Featured calculator.
• TI-2511, similar to TI-2500B. Featured calculator.
• TI-2550, listed in book. Photo.
• TI-2550 II, listed in book.
• TI-2550 III, listed in book.
• TI-5025, listed in book.
• TI-5050, listed in book.
• TI-5050M, listed in book.
• Texas Instruments Navigatronic, navigation calculator based on a TI-58 Programmable calculator fitted with a Navigation Module and supplied in a wooden case. Featured calculator.
• USMC Harrier VSTOL/REST Calculator, TI-58 calculator with "Harrier" program module for Vertical or Short Takeoff and Landing (V/STOL) and Range, Endurance, Speed, and Time (REST), Made for MCDONNEL AIRCRAFT COMPANY. Has a strap (for going round thigh ?) attached to the back by a Velcro pad. Featured calculator.
• Wiz-a-Tron, listed in book.
• Correction to book --- TI-58/TI-58C In the book these models are listed as having a programmable card reader. This is not true. Only the TI-59 had the reader.

Texatron

• Texatron, listed in book.

Texet

• 800M, 4-function, %, memory, red LED, 9v rep batt, 2.75x5.25", Hong Kong. Similar to Voesa 3000. Photo.  See also the "Standard Type 1 Calculator" page. Featured British calculator.
• 803PM, 4-function, %, memory, square root, green fluor. Photo. Description.
• 880, listed in book.
• 880A, 4-function, %, memory, X/Y, red LED, 9v rep batt, 3.0x5.4", ~1980. Designated 880 on calculator but 880A in the instruction manual - has only 4 buttons in top row, whereas the 880 has 5. Photo . Featured British calculator.
• 1200 STUDENT, 4 function, %, memory, square root, green fluorescent, 2- AA rep batt, 2.9x5.25", Hong Kong. Photo.
• 1500, listed in book.
• Pocket-8, 4-function, %, sq rt, green VFD, Japan. Jan 07.
• Pocket-8M, 4 function, %, memory, green VFD, 2-AA rep. batt., 79x140x23mm / 3.1x5.5x0.9", Japan. Photo. Featured British calculator . Sep 07.
• Pocket-8MR, 4 function, %, memory, square root, green VFD, 2-AA rep. batt., 79x140x23mm / 3.1x5.5x0.9", Japan. Photo. Featured British calculator. Sep 07.
• SCIENTIFIC 2001, Scientific, red LED, 9v rep batt, 3.0x5.7", Hong Kong, IC date coded 1979. Photo. Featured British calculator .
• Student, semi-scinetific functions, green VFD, 1-AA rep batt, 75x121x19mm / 3.0x4.8x0.75", Korea. Photo. Featured British calculator .
• Trader, four-function, %, memory, square root, green VFD, 2-AA rep batt, 81x132x20mm / 3.2x5.2x0.8", Japan. Photo. Featured British calculator .

Tik-Tron

• Model number not known, 4-function, %, square root, green VFD.

Timex

• Timemate aka 90002, 4-func, %, memory, square root, time & alarm, 8-dig & time yellow LCD, 4x mercury button cells, 71x133x11mm / 2.8x5.25x0.5", Japan. Photo .

TKS 2002 (TKS Corporation, Los Angeles, California, U.S.A.)

• 810N, listed in book.
• 812N, listed in book.
• 814M, 4-function, %, memory, red LED, 3-AA rep. batt., 77x138x20mm / 3.1x5.4x0.8", c1974, Korea. Photo, inside.
• 835MD, listed in book.

Tohotronic (Toho Tsusho Co. Ltd., Japan)

• Sensor 3. Photo.
• Gyro-3, 4-funct., %, mem., sq. rt., 8 digits, green VFD, 2-AA rep batt, 80x138x25mm / 3.2x5.4x1", Japan. Photo.
• Roger F-1, listed in book. Photo.
• Roger F-5, listed in book.

Toko

• Mini 8, listed in book.

Tokyo Electron Applications Laboratory - See TEAL

Tom Thumb

• "Tom Thumb", 4-function, red LED, 3.5x2x1".

Topaz

• 888, 4-func, %, 8-digits red LED, PP3 rep batt, 68x130x24mm / 2.75x5x1", Hong Kong. Photo.

Toshiba (Japanese company)

• BC-0801B, listed in book.
• BC-0804B, listed in book.
• BC-0806B, 4-function, red LEd, Japan. Jan 07.
• BC-0808B, listed in book. Photo.
• BC-602L, 4-function, %, 6-digits blue VFD, Japan. Photo.
• BC-603L, listed in book.
• BC-815, listed in book. Photo.
• BC-819, listed in book.
• BC-1010BJ, listed in book.
• BC-1015, listed in book.
• BC-1020PV, 4-function, %, memory, 10 digits, green fluorescent and printer, 3- AA rechargeable batt, 3.1x9.2", Japan.
• BC-8012, 4-function, %, sq. rt., green VFD, 4-AA rep. batt., Japan.
• BC-8013, listed in book.
• BC-8016, listed in book.
• BC-8018, listed in book.
• BC-8018B, listed in book.
• BC-8111, listed in book.
• BC-8111B, listed in book.
• SC-6100, listed in book.
• SC-7100, listed in book.

Transonic (we have no information about this company. If you can help please get in touch.)

• C15, 4-function, 6 digits red LED, 4-AA rep. batt., 81x171x22mm / 3.2x6.7x0.9", c1973, Hong Kong. Photo, inside.
• mini, 4-function, %, red LED, 4-AAA rep. batt. (similar to Prinztronic mini). Photo. Jan 07.

Tricom

• Tricom, listed in book.

Tri-Star (There is no information available about this company. If you have any information please get in touch.)

• 830MD, 4-functions, %, memory, sqare root, green VFD, 1-AA rep. batt., 74x117x19mm / 2.9x4.6x0.75", Korea, similar to Silver Reed 81. Photo. Mar 07.

Triton - Triton was a registered trademark of Radofin Electronic. See Radofin. Some Triton models are similar to Taktile models.

Triumph (European market calculator, same company as Adler, many models the same, some sold as "Triumph-Adler")

• 60, listed in book.
• 80C, listed in book.
• 81, same as Anita 811. Photo.
• 81S, listed in book.
• 81SN, 4 funct, %, memory, sq rt, 8 digits fluor, 3-AAA rep batt, 73x134x15mm / 2.9x5.3x0.6", Japan. Photo.
• 82M, listed in book.
• 88T, listed in book.
• 88TS aka EC42, sci funct, 8 digit green fluor, 2-AA rep batt, thin, aluminum front, 3.0x5.75".
• Lady, listed in book.
• Sir, listed in book.

TRQ (Spanish manufacturer)

• F, blue VFD, Spain.
• F-1001 Sci-funct, fluor, 2-AA rep batt, 2.75x5.25", dated 1-79, Spain.

Tryom (U.S. company)

• CC-7000, listed in book.

TSI (Telemetry Systems Inc.) (U.S. company)

• Speech+, listed in book. Featured calculator.
• Student Speech+, listed in book.

T Research

• 897D, listed in book.

U

UDM (see Universal Data Machine)

UIT

• 85X. Featured calculator.
• 22SP, listed in book.

Unico

• P 805, 4-function, %, green VFD, AA rep. batt., 72x110x22mm / 2.8x4.3x0.9", Singapore. Photo.
• R-846, listed in book.

Unicom (U.S. company) (also see Rockwell)

• 102, listed in book. Photo. Featured calculator.
• 103, listed in book. Photo.
• 104+, listed in book. Photo.
• 201, listed in book. Photo.
• 202/SR, listed in book.
• 802, listed in book.

UniMark (marked Interpur PO Box 2353 Orlando Fla. USA).

• 805T, 4-funct, %, fluor, 4-AA rep batt, 88x140x25mm / 3.5x5.5x1.0", Japan. Photo.

Union Carbide (U.S.A. chemical company).

• Union Carbide, 4-function, %, green VFD, 3-AAA rep batt, 50x92x20mm / 2.0x3.6x0.8", Japan, very small, similar to Royal 80K, was probably a promotional item. Photo . Feb 08.

Unisonic Note: many Unisonics had a number on the front (911L) and a variation number on the back (911L-A). Often there was a difference in the features or keys of the model from another variation of the same basic model number.

• 8PPMD, listed in book.
• 676, 4-functions, 6-digits red LED, 9v PP3 rep. batt., U.S.A. Photo. Feb 08.
• 711, 711-E, listed in book. Photo of 711.
• 728, listed in book.
• 730, listed in book.
• 733, listed in book.
• 737, listed in book.
• 738, listed in book.
• 738SQ, listed in book.
• 739SQ, 4-function, %, memory, sq. rt., blue VFD.
• 740-B, listed in book. Photo.
• 740-D, listed in book.
• 749-A, 4-function, %, memory, sgn chg, sq funct, recip, 8 digit green fluor, 4-AA rep batt, 3.6x6.0", Japan.
• 757, 4-function, %, memory, green VFD.
• 790R-C, listed in book.
• 790RM-1, listed in book.
• 796-B, listed in book.
• 811-A, listed in book.
• 811-C, listed in book.
• 811L, listed in book.
• 911L-A 4-funct, %, 8 digit red LED, 3-AA rep batt, very small, similar to other "911L" models, 2.5x3.75", Japan.
• 811L-B, listed in book.
• 830-A, listed in book.
• 831-A, 4-function, %, square root, green VFD.
• 839 SQ, listed in book.
• 840-C, listed in book.
• 840-E, listed in book.
• 849-A, listed in book.
• 850, listed in book.
• 888, listed in book.
• 890, listed in book.
• 890-A, listed in book. Photo.
• 890-C, listed in book.
• 911-C, listed in book.
• 911L-A, listed in book.
• 911L-B, listed in book.
• 911L-C, listed in book.
• 931-B, listed in book.
• 931-C, listed in book.
• 940, listed in book. Photo.
• 940-A, listed in book.
• 940-B, listed in book.
• 940-C, listed in book.
• 1011-A, listed in book.
• 1011-B 4-funct, %, sq rt, 8 digit green fluor, 4-AAA rep batt, Japan.
• 1034-D, listed in book.
• 1040-1, listed in book.
• 1040-A, listed in book.
• 1040-C, listed in book.
• 1048-A, listed in book.
• 1049-A, listed in book.
• 1099-A, listed in book.
• 1111-A, listed in book.
• 1196, listed in book.
• 1212, listed in book.
• 1299R-A, listed in book.
• 1511L This model is described and illustrated in the book. However there is a second variation that does not use a variation number. This model does not have keys for sign change and X-Y functions. Otherwise, the case, styling, and other functions are the same.
• 1540D, listed in book.
• 1540L, listed in book.
• 1541L, red LED "Standard type 2" calculator.
• 1542L, listed in book.
• 1548, listed in book.
• Casino 7, listed in book.
• CB-14, listed in book.
• Concept Compact "Super Thin", 4-function, %, memory, sq. rt., blue VFD, rechargeable batt.
• Mini 4-funct, 6 digit green fluor tubes, 4-AA rep batt, 80x153x40mm (3.1x6x1.6"), Japan. Photo.
• XL-101, listed in book.
• XL-112, listed in book.
• XL-115, listed in book.
• XL-117, 4-function, %, memory, green VFD & thermal printer, rechargeable batteries.
• Unisonic 21, listed in book.

Unitra Eltra (Polish company)

• BRDA 10U, 4-functions, %, memory, square root, square, red LED, 9v PP3 rep. batt., 145x80x25mm / 5.7x3.1x1.0", Poland, c1977. Photo. Mar 07.
• BRDA 11U, 4-functions, %, memory, square root, red LED, 9v PP3 rep. batt., 145x80x25mm / 5.7x3.1x1.0", Poland, c1977. Photo, inside. Mar 07.
• BRDA 12U, 4-functions, %, memory, square root, square, red LED, 6-AA rep. batt., 156x82x28mm / 6.1x3.2x1.1", Poland. Photo, inside. Mar 07.
• K-174, 4-functions, blue VFD, 5-AA rep. batt., 145x80x25mm / 5.8x3.1x1.0", Poland. Photo. Mar 07.
• K-174M, 4-functions, %, square root, blue VFD, 5-AA rep. batt., 165x100x44mm / 6.5x3.9x1.7", Poland. Photo. Mar 07.
• K-765, 4-functions, %, memory, red LED, 146x77x25mm / 5.75x3.0x1.0", Poland, c1977, resembles Commodore 897D. Photo. Mar 07.

Unitrex ("Unitrex of Canada Ltd")

• 8PPMD, listed in book.
• 80F, listed in book.
• 80KF, listed in book. Photo.
• 90SC, listed in book.
• 91PM, listed in book.
• 95SL, listed in book.
• 800D, listed in book.
• 800K, listed in book.
• 80KD, listed in book.
• 801D, listed in book.
• 801K, listed in book.
• 801ML, 4-function, %, memory, red LED, Hong Kong. Jan 07.
• 801R, listed in book.
• 801MR, listed in book. Photo.
• 803MP, listed in book.
• 901M, listed in book.
• 901MR, listed in book.
• 901PM, listed in book.
• 901R, listed in book.
• 901SR, listed in book.
• 902AS, listed in book.
• 902RM, listed in book.
• 902SL, listed in book.
• 902SN, listed in book.
• 905SL 4-funct, mem, %, sq funct, recip, green fluor, 2AA rep batt, 2.5x5.25", similar case to Radofin 1610, Hong Kong.
• 1000, listed in book.
• 1000M, listed in book.
• 1203, listed in book.
• CB8SL, listed in book.
• Executron 817D, listed in book.
• Micro 6, listed in book.
• Mini 8, listed in book.
• Mini Calculator, listed in book.
• Mini Handy, listed in book.
• Mini Handy 80M, listed in book.
• Mini Handy 80R, listed in book.
• Mini Handy 80SR, listed in book.
• mini handy 122 4-funct, red LED display, seperate LED shows "neg" and "bat," 9V rep batt, 2.75x4.75" (7x12 cm), Japan.
• UC25, 4-function, %, memory, red LED, 9v PP3 rep batt, Hong Kong. Jan 07.
• UC45, 4-funct, mem, %, sq rt, sgn chg, fluor, 9V rep batt, 3.0x5.25", Hong Kong.

Universal (European market calculator)

• 101 4-funct, mem, %, 8 digit red LED display, 9V rep batt, 3.0x5.0", all aluminum case, back slides to allow battery change. Photo.
• 202, listed in book.
• 303, listed in book.
• Executive, 4-function, 5, memory, red LED, PP3 rep. batt.

Universal Data Machine (UDM) (U.S. company)

• 9V9, listed in book.
• TKB001, photo2, inside, listed in book.

Unknown Manufacturer (if you have any information about the manufacturers and model numbers please get in touch)

• Unknown 1, 8 digits green fluor tubes, 4-func, 4-C rep batt, 132x247x42mm / 5.2x9.7x1.7", c1973, large and stylish, chrome plated calculator, featured on the "Puzzle Corner" page. Photo.
• Unknown 2, Photo, Child's Teaching Speaking Calculator. Featured calculator.
• Unknown 3, 4-function, %, 8 digits red LED, tiny calculator with battery pack which plugs directly into the AC supply. Photo, inside showing battery pack . Featured calculator.
• Unknown 4, scientific, 8 digits red LED, tiny calculator with battery pack which plugs directly into the AC supply. Photo, inside . Featured calculator. Apr. 07.
• TC-8M, 4-function, %, memory, green VFD, manufacturer unknown. Photo.

Unser Favorit (European market calculator)

• 303 4-funct, sq funct, recip, %, chg sgn, green fluor, 3.0x5.0" (74x128 mm), similar case to Mannics 303.
• 307 sci-funct, green fluor, 3.0x5.0" (7.4x12.8 cm), similar case to Mannics 303.

Uranus

• Calculator Watch, listed in book.

U-Tac

• ???, listed in book.

V

Vanguard (Made in Spain by Cahué Industrial S.A.)

• X-802, listed in book.  Photo 1, Photo 2.
• Polaris Eletronic 10 PA, 4-function, %, memory, red LED, 150x65mm / 5.9x2.6". Photo.

Vanity Fair

• Little Teacher, 4-function, %, red LED, 130x137x23mm / 5.1x5.4x0.9", Hong Kong, c1978. Photo. Apr 07.

Ventora

• Ventora, red LED, a "Standard Type 1" calculator.

Ventron

• VT-600, listed in book.
• VT-1200C aka Metric Conversion, listed in book.
• ??? version 1, listed in book.
• ??? version 2, listed in book.

Verax

• 874, listed in book.

Vic (Mexican company)

• 31, listed in book.

Victor Comptometer (U.S. company)

• 1 aka MEC/1 and 80-1420, listed in book.
• 2 aka MEC/2 and 80-1421, listed in book.
• 85 aka Tallymate, listed in book. Featured calculator.
• 95, listed in book. Photo.
• 104R, listed in book.
• 106, listed in book.
• 223 aka MEC/223, listed in book.
• 225 aka MEC/225, listed in book.
• 226 aka MEC/226, listed in book.

Victron Electronics Corp, Taiwan

• EC-811 Dataexac, 4 func, %, mem, green fluor tubes, 5AA rep batt, (88 x 150 mm), Taiwan. Photo.

Vista

• Z8FPR, listed in book.
• Z48AA, listed in book.
• Z48M, listed in book.
• Z48P, listed in book.

Vito (Swiss company)

• Elektron 2000, listed in book.

Voesa

• 3000, listed in book.

W

Weltelektrik (If you have any details of the company please get in touch)

• Weltelektrik, 4-funciont, 8 digits amber discharge tubes, 4-C rep batt.,c1972, Japan, similar to Rambler. Photo, inside 1 , inside 2.

Wentworth

• RG 301, 4-funct, 8 digit red LED display, sealed batt, 3.0x5.25", early boxy styling, Mexico. Photo.

Western Auto (U.S. company)

• Citation (version 1) aka 66-4986-7, listed in book.
• Citation (version 2), listed in book.
• Electronic Wizard (version 1) aka M4986 and 66-4986-7, listed in book.
• Electronic Wizard (version 2) aka TXI4993A47, listed in book.

X

XAM (Distributed by Korvettes Products Inc., New York, U.S.A.)

• 867, listed in book.
• 877, listed in book.
• 879, 4-function, %, memory, green VFD, 9v PP3 rep. batt., 74x130x34mm / 2.9x5.1x1.3", Taiwan. Photo. Apr 07.

Xonex Corporation Ltd. (Toronto, Canada)

• Executive aka. ELSI II, 4-funct, 8 digit green fluor tubes, 4-AA rep batt, 85x145x33mm/3.4x5.7x1.3", Japan, similar to Deetee ECL-81. Photo.

Y

Yashica

• Pickey, listed in book. Photo 1, Photo 2.

Z

Zeny

• 22M, 4-function, %, memory, sq. rt., blue VFD.
• 811, 4-function, %, memory, sq. rt., VFD. Photo

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Calculator Book Addendum A-B
Calculator Book Addendum C-D
Calculator Book Addendum E-I
Calculator Book Addendum J-O
Calculator Book Addendum P-R
Calculator Book Addendum S

Key to Abbreviations

Functions:
4-funct = 4 basic mathematical functions (addition, subtraction, multiplication, division)
sci-funct = scientific or engineering functions (logarithmic and trigonometric functions such as log, sine, and cosine and usually memory, square, pi, etc.)
mem = memory
% = percent function
exp = exponent
paren = parentheses
pi = pi value
recip = reciprocal
sgn chg = sign change
sq rt = square root
sq funct = square functions (including square and square root)

Battery Type:
button rep batt = very small, disk-shaped, replaceable batteries commonly termed button-types, used mainly in LCD models.
rep batt = replaceable batteries (such as 9V, AA, C, and N batteries)
rep batt pack = replaceable batteries in a removable pack
sealed batt = rechargeable batteries sealed in the case
sealed batt pack = rechargeable batteries in a removable pack

Display Type:
See the section on Calculator Displays for more detailed information.
Displays have 8 digits unless specified otherwise.

COS-LCD = Early Liquid Crystal Display from Sharp showing silver digits on a dark background. COS stands for Crystal on Substrate. This display was used as early as October 1973 but eventually was phased out.
fluor = see VFD.
Gas discharge = Display containing all digits sealed in a single package employing  gas discharge to generate light in the same way as a neon lamp. Normally give amber- or orange-colored digits, and typified by the Panaplex® used by a few calculator manufacturers.
LCD = Liquid Crystal Display, a flat, gray-digit type of display type that uses less power and was embraced by calculator makers by the end of the 1970s. Early versions (used in the early 1970s) by Rockwell and Sharp are included in this guide.
LED = Light Emitting Diode display (usually red although sometimes a purple filter was used to color the display). LEDs often have small half bubble-like covers over the digits. tube or mini-tube = separate vacuum or fluorescent tube for each digit of display.
Yellow LCD = Early LCDs had a reliability problem with ultra-violet light and manufacturers used a yellow-colored filter over the normally gray display to remedy that. Refinements in later LCD designs removed the need for the filter.
VFD = Vacuum Fluorescent Display. Display containing all digits sealed in a single tube generating light from an electrical discharge onto a fluorescent material. The color of the digits is normally green or blue, or somewhere in between.

Other Information:
Klixon keypad = Texas Instruments Klixon® keypad was one of the earliest keypads and used greatly by Bowmar and a few other early calculator makers. It had the four basic functions and used metal key pads about 1/2" square.
Japan (for example) = country of manufacture as stated on calculator
RPN = Reverse Polish Notation, a method of calculating and user data entry used by HP calculators. A few other manufacturers also used RPN in more limited scale.
"aka" (also known as) is used when there is another name or model variation on the calculator.
"c" (for example, c1973) is used as "circa," denoting at approximately that time.

A big thanks to Thomas Brockmeier, Richard Brooks, Andrew Davie, Larry Gilbert, Niels Grot, Palmer Hanson, Steve Haynes, Robert King, Kent King, Jeff Lane, Philippe Leckler, Ken Meine, Bob Patton, James Redin, and CB Wilson for their help.

How to Buy the Book!!!!

Collector's Guide to Pocket Calculators

by Guy Ball and Bruce Flamm

This 204 page, softcover book is the world's most comprehensive listing of electronic pocket calculators from the 1970's, the so-called Golden Age of Pocket Calculators. Over 1,500 known calculators are detailed with information on features, size, display type, power type, and pricing. In addition, when known, the listing also contains date of sales, original pricing, and country of origin information.

The book features over 470 photographs of various models from over 240 manufacturers around the world (including calculators from lesser-known companies in England, Switzerland, Netherlands, Spain, Germany, Bulgaria, and Russia).

"The Collector's Guide to Pocket Calculators" includes a comprehensive value guide to help you gauge rarity and desirability of the various models -- especially as they relate to each other.

The book can be purchased for $23.95 plus $4 for USA first class mailing ($2 for US mailing via slower book rate, $6 for first class mailing to Canada and Mexico, and $8 for airmail to other countries). California residents please add $1.86 state sales tax.

!!!! SPECIAL OFFER !!!!

As a special offer, mention this page (newcalc1) and deduct $4 off the price of the book. This offer is only valid if you mention this page. We're trying to see how many people actually read this. If you do, it is a great way to get a great price on a great book!!

Mail to:
Wilson/Barnett Publishing
P.O. Box 345, Tustin, CA 92781-0345, USA
For additional information, contact co-author Guy Ball for additional details and purchase information.

Copyright ©1997 Guy Ball and Bruce Flamm, ©2002-2008 Nigel Tout

Vintage Calculators

© Text & photographs copyright Nigel Tout  2000 - 2007, and otherwise as indicated.