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What was the first personal computer?

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Click here for further information on our rarity scale RARITY: Exceedingly Rare Information on the rarity of this item is unknown.

 YEAR: 1967
 COMPANY: I-Cor Systems
 COUNTRY: England
 IN OUR COLLECTION: Yes
 

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MAC-1 Mini-Analog Computer

 

There is very little information about this computer. It appears to have been designed to teach kids how to do math...the input dials certainly resemble a slide rule. It was offered as a kit (which you would put together yourself and that usually required some soldering) or you could get a fully-assembled version. The original cost for the kit was £3 10 shillings 6 quid (that is equivalent to $70.00 in 2024 USA dollars), while the "built and ready for use" MAC-1 sold for £3 19 shillings & 6 quid (equivalent to $90.00 in 2024 USA dollars)1.

The MAC-1 was developed by I-Cor Systems in England. Tracking down the date for this computer was difficult. The company that made the MAC-1, I-Cor Systems, also sold the Digi-Comp 1 in 1963 which was developed by ESR in Boston.2 So that gave us a starting place on the date. We found four I-Cor Systems ads; one ad for the MAC-1 from 1967 and two ads for Digi-Comp 1 and one ad for the MM Computer, all from 1967. Nothing before and nothing after.

The first small ad we found was for the Digi-Comp 1 and was buried in the back of the August 1967 issue of Practical Wireless magazine published in England. The ad was oddly titled "Digital Trial" which may be a reference to a trial offer but who knows. Another ad for the Digi-Comp 1 appeared in Practical Electronics magazine in April 1967.

We finally found a small ad for the MAC-1, again buried in the back of Practical Wireless December 1967 issue; this time the ad was entitled "Christmas Computer". Given the description of this computer in the ad (see just below), I'm really glad my parents got me a Davy Crockett record for Christmas.

According to the ad, "Just think...with this desk-top mini-analog computer you can multiply and divide, take square roots or powers, and do log operations--simply by turning the dials and keeping your eye on the null meter. The Instruction Manual covers MAC-1's applications in electronics and physics, engineering and trigonometry."

Thought we were all done? Nope. This is one of the reasons I find researching these old computers so much fun...I came across an ad in Meccano Magazine which was a magazine dedicated to building all sorts toys and science projects made by the Meccano Company. This particular ad was for a computer we had never heard about, the MM Computer. Hopefully, we will find more information on this and include it in the collection at TheComputerChurch.org.

All the ads were in magazines from 1967 which is why we are comfortable citing that as the year in which the MAC-1 was made. The address for I-Cor Systems was 18 Stamford Hill, London for both the Digi-Comp 1 ads (1967) and for the Meccano Computer (May 1967). However, the address changed to 4 Manor Road, London in the MAC-1 ad (Dec. 1967).





1After the Norman Conquest in 1066, the pound was divided into twenty shillings or 240 pennies. It remained so until decimalization on 15 February 1971, when the pound was divided up as it is still done today. Thanks to Project Britain

2https://t-lcarchive.org/i-cor-systems-digi-comp-1/




Copyright © 2024 by Early Computers Project, All Rights Reserved.



IMAGES
Click on any of the images below to see the slideshow. Front Front with cover removed View with ruler Top right corner Close up of voltage meter Close up of two bottom input dials Back up upper input dial Inside view: Back of lower left dial Inside view: Back of lower right dial Inside view: Back of voltage meter, shunt and zero button Inside view: Overall
COMPUTER COLLECTION LIST (PRE-1981)
(Analogs in blue)
  1. AIM-65 (single board)
  2. AIM-65 (factory case)
  3. AIM-65 (Jon Titus)
  4. ALICE micro-ordinateur
  5. Altair 680
  6. Altair 8800
  7. Altair 8800A
  8. Altair 8800b
  9. Altair 8800b Turnkey (see Pertec below)
  10. Altair 8800b (see Pertec below)
  11. Altair 8800b w/ Hardisk Controller & Datakeeper
  12. Altos ACS-8000
  13. American Basic Science Club Analog Computer
  14. AMF Educational Computer
  15. Apple II Plus
  16. ASCI SystemX
  17. ASR 33 Teletype
  18. Automatic Teaching Computer Kit
  19. Beckman ElectroComp Electric Heating Computer
  20. Beckman ElectroComp Energy Savings Computer
  21. Beckman Solid State Fuel Cost Computer
  22. Brainiac K-30
  23. Calif. Computer Systems 2200
  24. CES Ed-Lab 650
  25. Commodore 8032
  26. Commodore 64
  27. Commodore PET 2001
  28. Commodore Super Pet
  29. Compucolor II
  30. Compukit 1
  31. Compukit 1 Deluxe Model
  32. Compukit 2
  33. Compukit UK101
  34. Comspace CT-650
  35. Cosmac Elf (RCA1802)
  36. Cosmac Microtutor
  37. Cosmac Netronics ELF II
  38. Cosmac VIP
  39. Cromemco System I
  40. Cromemco System III
  41. Cromemco Z-2D
  42. Datapoint 2200
  43. Digi-Comp I (flat box)
  44. Digi-Comp I (square box)
  45. Digital Computer Lab
  46. Donner 3500
  47. Durango F-85
  48. Dynabyte
  49. E & L Inst MMD-1
  50. E & L Inst MMD-2
  51. Eagle II
  52. Electric Tabulating Machine (one original counter, 1889)
  53. Electronic Associates TR-10
  54. Electronic Associates TR-10 Model II
  55. Electronic Associates TR-20
  56. Electronic Associates TR-48
  57. Electronic Associates Model 180
  58. Electronic Associates Model 380 Hybrid
  59. Geniac
  60. Google Glass (definitely not vintage)
  61. Heath EC-1 (factory assembled by Heath)
  62. Heathkit EC-1 (kit)
  63. Heathkit ET 3100 trainer
  64. Heathkit H8
  65. Heathkit H9 Video Terminal
  66. Hickok Logic Teaching Sys.
  67. Hickok Servo Teaching Sys.
  68. HP 2115A
  69. HP 85
  70. HP 5036A
  71. HP 9825A
  72. HP 9825B
  73. HP 9830A
  74. Iasis 7301
  75. I-COR MAC-1
  76. ICS Microcomputer Training System
  77. IMSAI 108 (prototype)
  78. IMSAI 8048 Control Computer
  79. IMSAI 8048 (The Dollhouse Computer)
  80. IMSAI 8080
  81. IMSAI PCS-40
  82. IMSAI PCS-80
  83. IMSAI VDP-80
  84. Informer
  85. Intel Intellec MDS
  86. Intel MDS-800
  87. Intel Prompt 48
  88. Intel SBC 80/10
  89. Intel SDK-85
  90. Intel SDK-85 (unassembled)
  91. Intel SDK-86
  92. Intertec Superbrain
  93. ITT MP-EX
  94. JR-01 Computer
  95. KIM-1
  96. LAN-DEC
  97. LAN-DEC 20
  98. LAN-ALOG
  99. Lehrcomputer (Germany)
  100. Lawrence Livermore Lab
  101. Lear Siegler ADM3A
  102. Logikit LK255 (Feedback)
  103. Logix SF-5000 Electronic Computer
  104. MAC-1 Mini Analog Computer
  105. MAC Tutor (Bell Laboratories)
  106. MEK6800D2
  107. Micro 68
  108. Microtan 65
  109. Midwest Scientific Instruments 6800
  110. Minivac 601
  111. Minivac 6010
  112. Mini-Scamp Microcomputer
  113. Nascom I
  114. Nascom II
  115. National Radio Institute 832
  116. NEC TK-80
  117. NorthStar Horizon
  118. Olivetti Programma 101
  119. Olivetti Programma 203
  120. Olivetti Programma 602
  121. Open University PT501
  122. Ordinateur d'Apprentissage JR-01
  123. Osborne 1
  124. OSI 300
  125. OSI 600 (SuperBoard II)
  126. OSI C2-OEM-4
  127. OSI Challenger-1P
  128. Pastoriza Personal Analogue Computer
  129. Pertec MITS 300/25 (Altair desk business system)
  130. Pertec MITS 300/55 (Altair Turnkey business system)
  131. PolyMorphic Systems 8810
  132. PolyMorphic Poly-88
  133. Protech-83
  134. Range Keeper Mk.6 Mechanical Analog Computer, 1926
  135. Range Keeper Mk.7 Mechanical Analog Computer, 1935?
  136. Sargent-Welch Scientific Company Cat. No.7528 Analog Computer
  137. Science of Cambridge MK-14 (Sinclair)
  138. SD Systems Z80 starter kit
  139. Sharp MZ-40K
  140. Sharp MZ-80k
  141. Siemens ECB-85
  142. Signetics Instructor 50
  143. Sinclair ZX-81
  144. Smoke Signal Broadcasting
  145. Sol-20
  146. Spark16
  147. Sphere 1
  148. Sphere/SWTPC Computer System
  149. SWTP CMOS Microlab
  150. SWTP CT-82 Terminal
  151. SWTPC 6800
  152. SWTPC 6800 (w/ Smoke Signal Broadcasting drive)
  153. SWTPC CT-64 Video Terminal, SS-50
  154. SWTPC TV Typewriter II CT-1024
  155. Synertek VIM-1
  156. Synertek SYM-1
  157. Systron-Donner 3500
  158. Tei MCS-112
  159. Tektronix 4006-1
  160. Telefunken RAT 700
  161. TI LCM-1001 (Microprogrammer)
  162. TI LCM-1001 (Microprogrammer)
  163. TI Silent 700 Terminal
  164. TI TM 990/189
  165. Vector 1
  166. Vector 3
  167. Vidac 336
  168. Wang 2200
  169. Welch Scientific Company Cat. No.7528 Analog Computer
  170. Xerox 820 Mark I
OTHER COMPUTERS (LUGGABLES 1982-1986)
  1. Chameleon Plus
  2. Commodore SX64
  3. Epson HX-20
  4. Kaypro I
  5. Kaypro II
  6. Kaypro 2x
  7. Kaypro 16
  8. Osborne 1
  9. Panasonic Senior Partner
  10. Visual Commuter
RARE & NOTABLE DOCUMENTS
  1. Babbage's Calculating Engine (1834)
  2. Electric Tabulating Machine (1889, Herman Hollerith's personal copy)
  3. The Hollerith Electric Tabulating System (1890)
  4. Counting a Nation by Electricity (1891)
  5. Calculating Machines (1947)
  6. Moore School Lectures Vol. II (1947)
  7. Mathematical Theory of Communication (1948)
  8. Communication Theory of Secrecy Systems (1949)
  9. The "Moore's Law" article (Electronics, 1965)
  10. Printout from Babbage's Difference Engine #2 (London Science Museum, 2004)