Micro Instrumentation and Telemetry Systems: Difference between revisions

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{{Short description|American electronics company}}

{{Infobox company

| name = Micro Instrumentation and Telemetry Systems, (MITS)Inc.

| logo = MITS LOGO 1973.svg

| type = Private

| industry = [[Computer hardware]]

| fate = Acquired by [[Pertec Computer]] in 1977

| founded = {{Start date and age|1969|12}} in [[Albuquerque, New Mexico]], [[United States]]

| founder = [[Ed Roberts (computer engineer)|Ed Roberts]], [[Forrest Mims]]

| hq_location_city = Albuquerque, New Mexico

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| homepage =

}}

'''Micro Instrumentation and Telemetry Systems, Inc.''' ('''MITS'''), was an American electronics company founded in [[Albuquerque, New Mexico]] that began manufacturing electronic [[calculator]]s in 1971 and personal [[computers]] in 1975.<ref name = "CC Nov 1984">{{cite magazine | last = Mims | first = Forrest M. | title = The Altair story: the early days at MITS | magazine = Creative Computing | volume = 10 | issue = 11 | page = 17 | date = November 1984 | url = http://www.atarimagazines.com/creative/v10n11/17_The_Altair_story_early_d.php | access-date = 2009-07-27 | archive-date = 2007-04-08 | archive-url = https://web.archive.org/web/20070408035039/http://www.atarimagazines.com/creative/v10n11/17_The_Altair_story_early_d.php | url-status = dead }}</ref>

[[Ed Roberts (computer engineer)|Ed Roberts]] and [[Forrest Mims]] founded MITS in December 1969 to produce miniaturized [[telemetry]] modules for model rockets such as a roll rate sensor.<ref name = " Model Rocketry Apr 1970" >{{cite journal | last = Mandell | first = Gorden | title = From the launching pad | journal = Model Rocketry | volume = 2 | issue = 9 | page = 5 | publisher = Model Rocketry, Inc | ___location = Cambridge, MA | date = April 1970 | url = http://www.ninfinger.org/~sven/rockets/ModelRocketry/ModelRocketry.html }}The editor describes the first MITS modules with photo of the units.</ref> In 1971, Roberts redirected the company into the electronic calculator market and the MITS 816 desktop calculator kit was featured on the November 1971 cover of ''[[Popular Electronics]]''.<ref name="MITS 816"/> The calculators were very successful and sales topped one million dollars in 1973. A brutal calculator price war left the company deeply in debt by 1974.

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=== Founders ===

[[Henry Edward Roberts]] studied Electrical Engineering at the [[University of Miami]] before enlisting in the [[United States Air Force|U.S. Air Force]] in 1962.<ref name = "Zannos 2002">{{cite book | last = Zannos | first = Susan | title = Edward Roberts and the Story of the Personal Computer | publisher = Mitchell Lane Publishers | year = 2002 | page = [https://archive.org/details/edwardrobertssto0000zann/page/15 15] | isbn = 978-1-58415-118-0 | url = https://archive.org/details/edwardrobertssto0000zann/page/15 }}</ref> He soon became an electronics instructor at the [[Cryptography|Cryptographic]] Equipment Maintenance School at [[Lackland Air Force Base]] in [[San Antonio]], [[Texas]].{{sfnp|Roberts|Mims|1974|loc=back cover, author biography}} To augment his meager enlisted man's pay, Roberts worked on several off-duty projects and even set up a one-man company, Reliance Engineering. The most notable job was to create the electronics that animated the Christmas characters in the window display of [[Joske's]] department store in San Antonio. In 1965, he was selected for an Air Force program to complete his college degree, and became a commissioned officer. Roberts earned an Electrical Engineering degree from [[Oklahoma State University]] in 1968 and was assigned to the Weapons Laboratory at [[Kirtland Air Force Base|Kirtland AFB]] in [[Albuquerque, New Mexico]].{{sfnp|Mims|1986|pages=24–27}}

Forrest Mims was interested in science and electronics as a youth and even built an [[analog computer]] while in high school.<ref name = "ME 1987">{{cite magazine | last = Mims | first = Forrest | title = A Homebrew Analog Computer |magazine= Modern Electronics | volume = 4 | issue = 12 | pages =39–41 | date = December 1987 | issn = 0748-9889}}Mims describes the analog computer he built in high school. The article has a photograph and schematics of the computer.</ref> Mims graduated from [[Texas A&M University]] in 1966 (major in government with minors in English and history) then became a commissioned officer in the U.S. Air Force.<ref name = "Blind">{{cite news | title = New Device Helps The Blind | work = The San Antonio Light | page = 2 | date = April 15, 1966| quote = Although a political science major at A&M, Mims's second interest obviously is 'science and inventing things.'}}</ref> While serving in [[Vietnam]] as an intelligence officer, Mims continued his model rocket hobby.<ref name = "Rocketry in Vietnam">{{cite journal | last = Mims | first = Forrest M. | title = Model Rocketry in Vietnam | journal = Model Rocketry | volume = 2 | issue = 4 | pages =23–25 | publisher = Model Rocketry, Inc | ___location = Cambridge, MA | date = January 1970 | url = http://www.ninfinger.org/~sven/rockets/ModelRocketry/ModelRocketry.html}}</ref> At Texas A&M, Mims developed an infrared obstacle-sensing device and he experimented with it at the Saigon School for Blind Boys and Girls. Launching model rockets in an area accustomed to rocket attacks and working with blind children resulted in a story in the military newspaper, [[Stars and Stripes (newspaper)|''Stars and Stripes'']].<ref name = "Stars Stripes 1967">{{cite journal | title = There Is No Substitute For Talent | journal = Pacific Stars and Stripes | volume = 23 | issue = 291 | page =9 | ___location = Tokyo, Japan | date = October 19, 1967}}</ref> This caught the attention of an Air Force Colonel, who arranged for Mims to be assigned to the Weapons Laboratory at Kirtland AFB even though Mims lacked an engineering degree.{{sfnp|Mims|1986 |pages=62–69}}

Roberts and Mims were both assigned to the Lab's Laser Group in 1968. Roberts had reactivated Reliance Engineering and built an infrared intrusion alarm for his uncle's fish farm in [[Florida]]. Later, Roberts and Stan Cagle, a civilian worker who also went to Oklahoma State, started building a power supply they hoped to sell.{{sfnp|Mims|1986|pages=27–28}} Mims became an advisor to the Albuquerque Model Rocket Club and met George J. Flynn, the publisher of [[Model Rocketry (magazine)|''Model Rocketry'']] magazine, in July 1969. Mims told him about a transistorized tracking light that he had used on night launches of rockets in Vietnam. This led to an article in the September 1969 issue of ''Model Rocketry''; "Transistorized Tracking Light for Night Launched Model Rockets" by Captain Forrest Mims.<ref name = "Tracking Light">{{cite journal | last = Mims | first = Forrest M. | title = Transistorized Tracking Light for Night Launched Model Rockets | journal = Model Rocketry | volume = 1 | issue = 11 | pages =9–11 | publisher = Model Rocketry, Inc | ___location = Cambridge, MA | date = September 1969 | url = http://www.ninfinger.org/~sven/rockets/ModelRocketry/ModelRocketry.html}}</ref> Mims became a regular contributor to ''Model Rocketry''.

===Model rocket kits===

[[File:MITS Rocket Light Flasher.jpg|thumb|right| Transistorized tracking light for model rockets. The product that launched MITS]]

MannedCrewed space flight and the race to the moon in the 1960s made model rocketry a popular hobby. Roberts, Mims, Cagle and another Air Force officer from the Lab, Bob Zaller, decided they could design and sell electronics kits to model rocket hobbyists.<ref name="Albuquerque Tribune Jan 1970">{{cite news | last = Carlin | first = Margie | title = Want to Fly a Rocket? Albq Academy Is the Pad | work = Albuquerque Tribune | page = B10 | date = January 30, 1970}} Summary: Feature story on Albuquerque Model Rocketry Club. The club was organized by Air Force Captain Forrest Mims. Mims and three other Albuquerque engineers, Ed Roberts, Dan Cagle and Robert Zaller, have formed a new company, Micro Instrumentation and Telemetry Systems.</ref> Roberts wanted to call the new company Reliance Engineering, Mims wanted to form an acronym similar to the Massachusetts Institute of Technology's MIT. Cagle came up with Micro Instrumentation and Telemetry Systems, MITS.{{sfnp|Mims|1986|page=29}} The December 1969 issue of ''Model Rocketry'' (circulation 15,000) carried a press release that began:

<blockquote>Reliance Engineering in Albuquerque, New Mexico has announced the formation of a subsidiary company for the manufacture of miniaturized electronic and telemetry systems designed for model rockets. The company is called Micro Instrumentation and Telemetry Systems (MITS). Reliance Engineering president Henry Roberts announced that "MITS is presently conducting an intensive research program involving high quality miniature telemetry systems."</blockquote>

<blockquote> The first commercially available model rocket telemetry transmitter is among the first items to be offered by MITS. Accessory modules including a tone beacon, temperature sensor, and a roll rate sensor, as well as tracking lights, ground systems for data reduction, and light weight, water activated batteries will soon be available.<ref name = "Press Release 1969">{{cite journal | title = New Product Notes | journal = Model Rocketry | volume = 2 | issue = 3 | page =37 | publisher = Model Rocketry, Inc | ___location = Cambridge, MA | date = December 1969 | url = http://www.ninfinger.org/~sven/rockets/ModelRocketry/ModelRocketry.html}}</ref> </blockquote>

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== Calculators ==

[[File:MITS Calculator 1200 Series 1973 advertisement.jpg|thumb|right| Sales had reached $100,000 per month when this advertisement ran in March 1973.]]

Ed Roberts' interest in computers began in high school when he built a simple digital computer from relays. His first real experience with computers came while at [[Oklahoma State University]] where engineering students had free access to an [[IBM 1620]] computer. Roberts' office at Weapons Laboratory had the state of the art [[Hewlett-Packard 9100A]] programmable calculator in 1968. In July 1970, a semiconductor company, [[Electronic Arrays]], announced a set of six LSI ICs that would make a four-function calculator.<ref name = "EAS100">{{cite journal | title = New Products: Do-it-yourself Electronic Calculator | journal = Computer | volume = 3 | issue = 6 | pages =38–41 | publisher = IEEE | date = November 1970 | url = https://books.google.com/books?id=GJ2wAAAAIAAJ&q=%22Electronic+Arrays%22+Calculator | doi = 10.1109/C-M.1970.216730 | quote = Electronic Arrays has developed the EAS100, a set of MOS LSI circuits for a 16 digit calculator with 8 digit display capability.| url-access = subscription }}</ref><ref name = "Calculator Patent">{{US patent reference | number = 3800129 | y = 1974 | m = 03 | d = 26 | inventor = Richard H. Umstattd | title = MOS Desk Calculator}} The Electronic Arrays, Inc. calculator chip set that was used in the MITS 816 calculator.</ref> Roberts was determined to design a calculator kit.

To fund the new project, Roberts sold 15% of MITS to fellow Air Force officer, Lieutenant William Yates. He also got an investment from another Weapons Laboratory officer, Major Ed Laughlin. Several other officers and scientistscientists at the lab were interested in this state of the art calculator kit and helped with the design. Forrest Mims wrote the assembly manual in return for a calculator kit.

The MITS 816 was known as a "four-function" calculator; it could add, subtract, multiply and divide. The display was only 8- digits but the calculations were done to 16- digits of accuracy. The custom molded case gave the kit a professional appearance; the kit was $179 and an assembled unit was $275. The MITS 816 was featured on the November 1971 cover of ''[[Popular Electronics]]''.<ref name = "MITS 816">{{cite magazine | last = Roberts | first = Ed | date = November 1971 | title = Electronic desk calculator you can build |magazine= Popular Electronics | volume = 35 | issue = 5 | pages =27–32 | url=https://archive.org/details/popularelectroni35unse_3/page/27/mode/1up | url-access=registration}}</ref> Thousands of calculator orders came in each month, in contrast to poor results for previous kits that MITS had offered.<ref name = "Albq Journal Oct 1971">{{cite news | last = Cliff | first = W. Wilson | title = Little Firm in City Making Big Name with Calculator | work = Albuquerque Journal | page = G-2 | quote = But hundreds of thousands of electronics enthusiasts the world over have read about MITS within the last 10 days and no less than 200 already bought the light-weight 16-digit electronic calculator… | date = October 31, 1971}}</ref>

The steady flow of calculator sales allowed MITS to run full page advertisements in ''Radio-Electronics'', ''Popular Electronics'' and ''Scientific American''. In the June 1972 ''Radio-Electronics'', MITS announced a 14 digit calculator (Model 1440) with memory and square root function for $199.95 kit and $249.95 assembled. The original 816 kit was reduced from $179 to $149.95. Both calculators could be controlled by upcoming programming unit.<ref name = "RE June 1972">{{cite magazine | title = MITS announces our forth generation. |magazine= Radio-Electronics | volume = 43 | issue = 6 | page =13 | date = June 1972}} Full page advertisement of the Model 1440 calculator.</ref>

The monthly sales reached $100,000 in March 1973 and MITS moved to larger building with 10,000 square feet (930 square meters) of space.<ref name = "Albq Tribune Apr 1973">{{cite news | last = Lucas | first = Urith | title = Albq calculator firm to expand plant, triple number of employees | work = The Albuquerque Tribune | page = C14 | date = April 20, 1973}} Summary: MITS to move to the Cal-Lin Building, 6328 Linn NE in May. Now at 5404 Coal SE. Employment is expected to rise from 62 to 180 or 200. Company will have 10,000 square feet on one floor. Calculator sales reached $100,000 in March.</ref> To meet the demand for assembled calculators, an automated [[Wave soldering|wave solder machine]] was installed.<ref>{{harvp|Roberts|Mims|1974|pages=74–83}} The "Calculator Manufacturing" section describes in detail how MITS produces calculators and has 10 photographs of the process.</ref> In 1973 MITS was selling every calculator they could make,; 110 employees worked in two shifts assembling calculators.{{sfnp|Young|1998|pages=152–153}}

The functionality of calculator ICs increased at a rapid pace and Roberts was designing and producing new models. The MITS 7400 scientific and engineering calculator was introduced in December 1972. It featured trigonometric functions, polar to rectangular conversion, two memories, and up to a seven-level [[Stack (data structure)|stack]]. A kit with a three-level stack was $299.95 and an assembled unit with a seven-level stack was $419.95.<ref name = "RE December 1972">{{cite magazine | title = A New Standard! MITS 7400 Scientific and Engineering Calculator |magazine= Radio-Electronics | volume = 43 | issue = 12 | page =17 | date = December 1972}} Full page advertisement of the Model 7400 scientific calculator.</ref> The next month the Series 1200 four-function pocket calculators were announced. The six-digit model was $59.95 and the twelve-digit model was $99.95.

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=== Price wars ===

[[Bowmar Instrument Corporation]] introduced the "Bowmar Brain", a four-function pocket calculator, in September 1971 and the $179 calculator sold over 500,000 copies in the first year. Bowmar then developed the "901B" calculator that was priced at $120.<ref name = "Schnaars 1997">{{cite book | last = Schnaars | first = Steven P. | title = Marketing Strategy: Customers And Competition | publisher = Simon and Schuster | year = 1997 | page = 48 | url = https://books.google.com/books?id=vvfmcTAGdloC&pg=PA48 | isbn = 978-0-684-83191-6}}</ref> In September 1972, [[Texas Instruments]] (TI) introduced the TI-2500 portable four-function calculator that also sold for $120.<ref name = "Computer 1972">{{cite journal | title = New Products | journal = Computer | volume = 5 | issue = 6 | pages =59–63 | publisher = IEEE | date = November 1972 | doi = 10.1109/C-M.1972.216999 | quote = The TI-2500 portable electronic calculator is a four-function, full-floating decimal-point unit with an eight-digit light emitting-diode display. With a suggested retail price of under $120, the TI-2500 calculator is rechargeable and capable of portable or ac operation.}} The calculator was previewed in June 1972 and formally released on September 21, 1972</ref> The 901B and the TI-2500 both used the TI TMS0100 family of "calculator-on-a-chip" integrated circuit. TI was now directly competing with their IC customers. Other semiconductor companies such as National Semiconductor and Rockwell began selling calculators. [[Commodore International|Commodore Business Machines]] and other office equipment companies also got into the market. A frenzied price war started. By early 1974, Ed Roberts found he could purchase a calculator in a retail store for less than his cost of materials. The larger companies could sell below cost to win market share. Bowmar lost $20 million in 1974 and filed for bankruptcy.<ref name = "NY Times Feb 1975">{{Cite news | last = Smith | first = William D. | title = Bowmar Will Ask Reorganization | newspaper = The New York Times | page = 55 | date = February 11, 1975}}</ref> Commodore acquired their IC supplier, [[MOS Technology]]. Texas Instruments won the price war but their calculator division lost $16 million in 1975.<ref>{{sfnpharvp|Young|1998|pages=153–154}} The book quotes the September 1975 ''Forbes'' magazine on the hand-calculator market. It also details the MITS stock offering.</ref>

To compete in this market, Roberts needed more capital. He took MITS public in November 1973 with a stock offering of 500,000 shares at $1 each. The [[1973 oil crisis]] caused a stock market downturn and MITS was only able to sell 250,000 shares.{{sfnp|Mims|1986|pages=40–41}} This allowed MITS to pay off the existing debt, but did not allow for any expansion. Roberts had developed several test equipment products such as a Waveform Generator and a Digital Voltmeter so he attempted to appeal to kit builders again by featuring the test equipment and digital clocks in the advertisements, instead of calculators. MITS was losing money, and by July 1974, the full page prominent ads were replaced with quarter-page ads in the back of the magazine.<ref name="RE July 1973">{{cite magazine | title = It's About Time |magazine= Radio-Electronics | volume = 45 | issue = 7 | page =75 | date = July 1974}} A quarter-page advertisement for the MITS DC100 clock/timer. Kit $79.95, assembled $99.95</ref>

MITS was now $300,000 in debt and Roberts was looking for a new hit product. He decided to return to the kit market with a low cost computer. The target customer would think that "some assembly required" was a desirable feature. Roberts had looked at the [[Intel 4004]] for calculators and thought the [[Intel 8008]] was limited and difficult to work with, so he chose the most recent [[Intel 8080|8080]] as the basis for his machine.{{sfnp|Young|1998|pages= 155–158}} The target price of this complete computer kit had to be under $400. To meet this price, Roberts agreed to order 1000 microprocessors from Intel for $75 each.{{sfnp|Ceruzzi| 2003|pages=227–228}} Roberts and his head engineer, Bill Yates, began designing the computer. The company was down to 20 employees and a bank loan for $60,000 financed the design and initial production of the new computer.

==''Popular Electronics'' and ''Radio-Electronics''==

In January 1972, ''Popular Electronics'' changed its editorial focus in an attempt to attract more advertising revenues. Reviews of stereo equipment and [[citizens' band radio|citizens band radio]] were featured; experimenter and constructions projects were gone. Dan Meyer, Don Lancaster, Forrest Mims, [[John Simonton]] and many other authors immediately started contributing to the competing ''[[Radio-Electronics]]'' magazine. The June 1972 cover story was "Experimenting with a $32 Solid State Laser" by Forrest Mims. Another article in that issue was "Experiments with Op-Amps" by B.R. Rogen; this was a [[pseudonym]] of ''Popular Electronics'' technical editor, Les Solomon.{{sfnp|Mims|1986|page=168}} Solomon wrote articles for ''Radio-Electronics'' while working for ''Popular Electronics''. Lou Garner, the longtime solid-state editor, moved to ''Radio-Electronics'' for a year.<ref name = "Garner 1973">{{cite magazine | last = Garner | first = Lou | title = The state of solid state |magazine= Radio-Electronics | volume = 44 | issue = 1 | page =55 | publisher = Gernsback | date = January 1973}} Describes the expanded TMS0100 family of "calculator-on-a-chip" MOS/LSI integrated circuits. The article includes an illustration of a chip layout.</ref> Several MITS kit projects were featured in ''Radio-Electronics'' including the ITC 1800 Integrated Circuit Tester (May 1972), the Model 1700 Function Generator (July 1973), the Model 1440 Calculator (July 1973) and the 88 VLCT Computer Terminal (November 1974).

''Radio-Electronics'' had a smaller circulation than ''Popular Electronics'' but led the way with innovative construction projects between 1972 and 1975. John Simonton's first modular electronic music synthesizer was featured on the cover of the May 1973 issue.<ref name = "Simonton 1973">{{cite magazine | last = Simonton | first = John | author-link = John Simonton | title = Build a Modular Electronic Music Synthesizer |magazine= Radio-Electronics | volume = 44 | issue = 5 | pages =38–41 | date = May 1973}}</ref> It sold for a fraction of commercial synthesizers and his [[PAiA Electronics]] produced them for decades. Don Lancaster's [[TV Typewriter]] in September 1973 and Jon Titus's [[Mark-8]] computer in July 1974 were the catalyst of the home computer revolution.

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| publisher = Bonnier Corporation }}ADM-3A Terminal cost $795 (kit) and $895 (assembled).</ref> Most of these computers had a front panel with toggle switches for entering data and lights for displaying it. These were normally used to boot the computer and to diagnose problems.

The Altair 8800 kit came with a front panel, a CPU board with the Intel 8080 microprocessor, 256 bytes of RAM, a 4-slot backplane and an 8-amp power supply for $439.<ref name = "MITS Price List">{{cite magazine | author = MITS |date=August 1975 | title = Worlds Most Inexpensive BASIC language system |magazine= Popular Electronics | volume = 8 | issue = 2 | page =1 | publisher = Ziff Davis}}</ref> A 1k byte memory board was $176 and the 4k byte board was $264. The serial interface board was $124 and the parallel interface was $119. The Teletype Model 33 ASR was $1500. There was a special price for an 8k byte system with [[Altair BASIC]] ([[Microsoft]]'s first ever product) for $995. [[Bill Gates]], and [[Paul Allen]] wrote [[Altair BASIC]] with [[Monte Davidoff]] contributing the [[Floating-point arithmetic]] routines. [[Altair BASIC]] initial developed from February 1975 to May 1975 and announced by MITS in July 1975, the 4k version on paper tape for $150, the 8k version with cassette support for $200 and the Extended 16k version with disk support (December 1975) for $350. To encourage selling more boards, Altair BASIC was discounted to $60, $75, $150 respectively, when bundled with 4k, 8k and I/O boards

When the January 1975 issue of ''Popular Electronics'' reached readers in mid December 1974, MITS was flooded with orders. They had to hire extra people just to answer the phones. In February, MITS received 1,000 orders for the Altair 8800. The quoted delivery time was 60 days but it was many more months before the machines were shipped. By August 1975, they had shipped over 5,000 computers.<ref name = "Byte Oct 1975">{{cite magazine | last = Green | first = Wayne |date=October 1975 | title = From the Publisher .. Are they real? |magazine= BYTE | volume = 1 | issue = 2 |pages=61, 81, 87 | publisher = Green Publishing}} In August 1975, Wayne Green visited several personal computer manufacturers. A photo caption in his trip report says; "Meanwhile, at MITS, over 5,000 Altair 8800's have been shipped. Here is a view of part of the production line."</ref>

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Godbout also sold components to [[Processor Technology]] for their 4K Static RAM board and serial / parallel interface board. [[Lee Felsenstein]] designed an Altair compatible video board that provided 16 lines of 64 upper and lower case characters on a black and white television. This $160 board became very popular and led to the Processor Technology [[Sol-20]] Computer in 1976.<ref name = "VDM-1">{{cite magazine | date = February 1976 | title = Introducing VDM-1|magazine= Popular Electronics | volume = 9 | issue = 2 | page =100}} Processor Technology Video Display advertisement. Features 16 lines, 64 characters, upper and lower case. $160</ref>

The [[IMSAI 8080]], the first "clone" of the Altair computer, was released in December 1975.<ref name = "ComputerLand">{{cite book | last = Littman | first = Jonathan | title = Once Upon a Time in ComputerLand: The Amazing, Billion-Dollar Tale of Bill Millard | publisher = Price Stern Sloan | date =1987 | page = 18 | ___location = Los Angeles | isbn = 0-89586-502-5 | url=https://archive.org/details/onceupontimeinco0000litt/ | url-access=registration }} "Later that day, December 16 [1975], United Parcel Service picked up the first shipment of 50 IMSAI computer kits for delivery to customers."</ref> It corrected many shortcomings of the original Altair 8800 by providing a larger power supply, a 22 slot motherboard, and easier wiring of the front panel. Ed Roberts reviewed the IMSAI in his April 1976 column in ''Computer Notes'', and agreed that the IMSAI was in some ways better than the original Altair. Roberts also pointed out that the new Altair 8800B was superior to the IMSAI 8080 and the upgraded Altair 8800A fixed the same issues that the IMSAI did.<ref name="CN April 197 p36">{{cite journal|last=Roberts |first=Ed |title=Ramblings from Ed Roberts |journal=Computer Notes |volume=1 |issue=11 |page=3 |publisher=MITS |___location=Albuquerque NM |date=April 1976 |url=http://startup.nmnaturalhistory.org/gallery/notesViewer.php?ii=76_4&p=3 |url-status=unfit |archive-url=https://web.archive.org/web/20120323162008/http://startup.nmnaturalhistory.org/gallery/notesViewer.php?ii=76_4&p=3 |archive-date=March 23, 2012 }}</ref>

Altair computers were only available from the 20 or so authorized Altair computer dealers, but the IMSAI 8080, Processor Technology Sol and many other clones were sold by hundreds of newly opening computer stores.

The S-100 bus was used throughout the 1980s until it was overtaken by the IBM PC [[Industry Standard Architecture|ISA]] bus. [[Seattle Computer Products]] (SCP) was a manufacturer of S-100 memory boards. The company's engineer, [[Tim Paterson]], designed an [[Intel 8086]] [[Central Processing Unit|CPU]] system on two S-100 boards in 1979. [[Microsoft]], then in nearby Bellevue, Washington, used the prototype machine to test their 8086 version of BASIC. Digital Research had promised to deliver an 8086 version of their [[CP/M]] operating system by December 1979 but missed that date. SCP needed a disk operating system to sell its 8086 products so Patterson wrote [[86-DOS|QDOS]], a "Quick and Dirty Operating System" in three months. Microsoft would later purchase QDOS from SCP for $50,000 and use it as the basis for the [[IBM PC DOS]].{{sfnp|Manes|Andrews|1994|pages=134–136}}<ref name = "InfoWorld Sep 1981">{{cite magazine | last = Hogan | first = Thom | title = IBM Announces New Microcomputer System |magazine= InfoWorld | volume = 3 | issue = 18 |pages=1, 14 | date = September 14, 1981 | url = https://books.google.com/books?id=Mj0EAAAAMBAJ&pg=PA14 | issn = 0199-6649 | publisher = InfoWorld Media Group, Inc.}}</ref>

=== Altair BASIC ===

{{Main|Altair BASIC}}

[[File:Altair Computer Ad August 1975.jpg|thumb|right| An Altair 8800 kit with 8 KB of memory and Altair BASIC cost only $995 in August 1975.]]

In December 1974 Bill Gates was a student at [[Harvard University]] and Paul Allen worked for [[Honeywell]] in Boston. They saw the Altair 8800 computer in the January 1975 issue of ''Popular Electronics'' and knew it was powerful enough to support a [[BASIC]] interpreter.<ref>The January 1975 issue of ''Popular Electronics'' was published on November 29, 1974. [[:File:Copyright Popular Electronics 1975.jpg|Copyright record.]]</ref> They wanted to be the first to offer BASIC for the Altair computer, and the software development tools they had previously created for their [[Intel 8008]] microprocessor based [[Traf-O-Data]] computer would give them a head start.{{sfnp|Manes|Andrews|1994|pages=68–70}} While their friend, Paul Gilbert, was building the computer, Allen wrote a program that ran on a DEC [[PDP-10]] [[time-sharing]] computer that simulated the 8008 system. He also modified DEC's [[Assembly language|macro assembler]] to produce the machine code for the 8008 microprocessor. The Traf-O-Data software could be written and debugged before the computer hardware was complete.{{sfnp|Manes|Andrews|1994|pages=50–54}} Gates and Allen worked at TRW where they had unlimited access to a PDP-10.</ref>

Harvard had a [[Digital Equipment Corporation|DEC]] [[PDP-10]] that was available for student use. They would use it to develop BASIC.<ref name="harddrive PDP-10">{{cite book | last=Wallace | first=James | author2=Jim Erickson | title=Hard Drive: Bill Gates and the Making of the Microsoft Empire | publisher=John Wiley & Sons | year=1992 | pages=[https://archive.org/details/harddrivebillgat00wall_0/page/81 81–83] | isbn=0-471-56886-4 | url=https://archive.org/details/harddrivebillgat00wall_0/page/81 }}"When Harvard officials found out that he (Gates) and Allen had been making extensive use of the university's PDP-10 to develop a commercial product, they were not pleased." The computer was funded by the Department of Defense and was under the control of Professor Thomas Cheatham. "Although DARPA was funding the PDP-10 at Harvard, there was no written policy regarding its use."</ref> While Allen modified their development software for the new 8080 microprocessor, Gates began writing 8080 assembly language by hand on yellow legal pads. They enlisted another Harvard student, [[Monte Davidoff]], to write the math routines.{{sfnp|Manes|Andrews|1994|pages=50–54}}

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The Altair products were merged into the Pertec line and the MITS facility was used to produce the PCC-2000 small-business computer. The Albuquerque plant was closed in December 1980 and the production was moved to Pertec plants in Irvine, California.<ref name = "InfoWorld Dec 1980">{{cite magazine | last = Milewski | first = Richard | title = Last Vestige of Mits Closes |magazine= InfoWorld | volume = 2 | issue = 22 | page =7 | date = December 8, 1980 | url = https://books.google.com/books?id=mD4EAAAAMBAJ&pg=PT6 | issn = 0199-6649 | publisher = InfoWorld Media Group, Inc.}}</ref>

By the end of 1977 Roberts left MITS and returned to Georgia to be a gentleman farmer. He studied medicine at [[Mercer University]] in Macon, Georgia and graduated with a [[Doctor of Medicine|M.D.]] in 1986. Roberts practiced medicine in [[Cochran, Georgia]], population 4500, until his death in 2010.<ref name = "NYTimes obit">{{Cite news | last = Lohr | first = Steve | title = H. Edward Roberts, PC Pioneer, Dies at 68 | newspaper = The New York Times | date = April 2, 2010 | url = https://www.nytimes.com/2010/04/03/business/03roberts.html}}</ref>

== See also ==

*[[Altair 8800]]

*[[Model Rocketry (magazine)|''Model Rocketry'']]

== Works cited ==

*{{cite book | last = Ceruzzi | first = Paul E. | title = A History of Modern Computing | publisher = MIT Press | year = 2003 | ___location = Cambridge, MA | isbn = 0-262-53203-4 | url = https://archive.org/details/historyofmodernc00ceru_0 | url-access=registration }}

*{{cite book | last1 = Manes | first1 = Stephen | author-link1 = Stephen Manes |first2=Paul |last2=Andrews | title = Gates | publisher = Simon and Schuster | year = 1994 | ___location =New York | isbn = 978-0-671-88074-3}}

*{{cite book | last = Mims | first = Forrest M | author-link = Forrest Mims | title = Siliconnections: Coming of Age in the Electronic Era | publisher = McGraw-Hill | year = 1986 | ___location = New York | isbn = 978-0-07-042411-1 | url = https://archive.org/details/siliconnectionsc00mims | url-access=registration }}

*{{cite book | last1 = Roberts | first1 = H. Edward | author-link = Ed Roberts (computer engineer) |first2=Forrest |last2=Mims | title = Electronic Calculators | publisher = Howard W Sams | year =1974 | ___location = Indianapolis | isbn = 978-0-672-21039-6}}

*{{cite book | last = Young | first = Jeffrey S. | title = Forbes Greatest Technology Stories: Inspiring Tales of the Entrepreneurs | url = https://archive.org/details/forbesgreatest00youn | url-access = registration | publisher = John Wiley & Sons | year =1998 | ___location =New York | isbn = 0-471-24374-4}} | chapter=Chapter 6 "Mechanics: Kits & Microcomputers" }}

==Notes==

Line 225 ⟶ 221:

*[http://www.vintagecalculators.com/html/mits_150.html MITS 150 Handheld Calculator at Vintage Calculators Web Museum]

*[http://datamath.org/BASIC/DATAMATH/ti-2500-1.htm TI-2500 at Datamath Calculator Museum]

*[http://www.vintage-computer.com/altair8800.shtml Altair 8800 Computer at Vintage-Computer Web Site] {{Webarchive|url=https://web.archive.org/web/20111210091503/http://www.vintage-computer.com/altair8800.shtml |date=2011-12-10 }}

*[https://web.archive.org/web/20090408081557/http://www.sunandsky.org/MITS_History.php Forrest Mims - Early Days At MITS]

*[https://web.archive.org/web/20111005221730/http://www.altair32.com/Altair32history.htm Brief History of the Altair. Copies of Altair articles in ''Popular Electronics'']

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