Electronic Arrays 9002

Electronic Arrays 9002 (EA9002) was a microprocessor released in 1976.[3][1]

Electronic Arrays 9002
General information
Launched1976; 45 years ago (1976)
Common manufacturer(s)
  • Electronic Arrays
Max. CPU clock rate4 MHz[1]
Data width8
Address width12
Architecture and classification
Instruction setElectronic Arrays 9002
Physical specifications

It was an 8-bit NMOS CPU, with an instruction set influenced by the Intel 4004.[4] It had a 4096 byte address space, due to its use of 12-bit addressing.[5][6]

It was reported to have a 2 microsecond instruction fetch and execution time,[7][8] although another source says 3.2 microseconds for single byte instructions and 6.4 microseconds for two byte instructions.[9]

The EA9002 was largely unsuccessful. Its manufacturer, Electronic Arrays, struggled financially and with process issues.[10] By November 1977, Electronic Arrays had ceased active marketing of the EA9002,[11] and in 1978 it was acquired by NEC.[12][13]

Electronic Arrays supplied macro assemblers for the EA9002 for IBM 360 and National CSS mainframe systems.[2] ASM/GEN and SIM/GEN, systems for developing for cross-assemblers and simulators in FORTRAN IV, supported the EA9002 as a target.[14]


  1. ^ a b Wickes, W.E. (1977). "A Microprocessor Chip Designed with the User in Mind". Computer. 10 (1): 18–22. doi:10.1109/C-M.1977.217492. ISSN 0018-9162.
  2. ^ a b c Wickes, William E. (January 22, 1976). A MICROPROCESSOR DESIGNED WITH THE USER IN MIND (PDF). Microprocessor/Memory Proceedings Integrated Circuit Applications Conference. Integrated Circuits Applications Conference / Electronic Engineering Times. pp. 36–54.
  3. ^ Cushman, Robert H. (September 20, 1975). "2-1/2 Generation μP's -$10 Parts That Perform Like Low-End Mini's" (PDF). EDN. Boston: Cahners Publishing. 20 (17): 36–42. A class of what might be called 2-1/2-generation microprocessors is now entering the market- place. This includes the MOS Technology 650X family, the National SCAMP and the Electronic Arrays 9002... Electronic Arrays' 9002 is in mask preparation and first parts are expected in October [1975]... Electronic Arrays' 9002 has a 7-level internal push-down stack for its PC subroutine nesting and 64 bytes of internal RAM. Therefore, the 9002 can get by without any external RAM...
  4. ^ Davies, Anthony J. (31 January 1979). "Microprocessors and their use in Physics". Advances in Electronics and Electron Physics. Academic Press. 47: 113. ISBN 978-0-08-057712-8.
  5. ^ Dagless, E.L. (21 December 1978). "Processing Elements - PMS". The Microprocessor and Its Application: An Advanced Course. Cambridge University Press. p. 46. ISBN 978-0-521-22241-9.
  6. ^ Aspinall, D. (23 December 1976). The microprocessor as a component (PDF). 1976 CERN School of Computing, La Grande Motte, France, 12–25 September 1976. p. 106.
  7. ^ Savon, Karl (May 1976). "State of Solid State" (PDF). Radio-Electronics: 69.
  8. ^ "New low-end 8-bit microprocessor" (PDF). Microcomputer Digest. 2 (6). December 1975. pp. 1, 4. Retrieved 2018-06-12.
  9. ^ "PRO-LOG ANNOUNCES 9002 CARD" (PDF). Microcomputer Digest. 3 (7). January 1977. p. 11. Retrieved 2018-06-12.
  10. ^ "The Chip Collection - Review Microelectronics News, September 18, 1976 - Smithsonian Institution". smithsonianchips.si.edu. September 18, 1976. Retrieved 2018-06-12. EA is in for some continuing hard times as they attempt to build up a market for the EA 9002 microprocessor and other new products to replace the lost calculator custom business. The process problems at this critical time don't help either.
  11. ^ Cushman, Robert (20 November 1977). "EDN's Fourth Annual Microprocessor Directory" (PDF). EDN. p. 45. Retrieved 23 June 2018. EA9002–The project staff at Electronic Arrays associated with this μP has been disbanded and the marketing effort closed down. The firm entered the market too late and was too small to mount a competitive sales effort.
  12. ^ Dennis J. Encarnation (1993). Rivals Beyond Trade: America Versus Japan in Global Competition. Cornell University Press. p. 126. ISBN 0-8014-8122-8. NEC shifted strategy and moved quickly in 1978 to acquire a financially troubled U.S. company (Electronic Arrays) that already traded with NEC
  13. ^ "Nippon Merges U.S. Arms, Forms NEC Electronics". Computerworld. 15 (16). April 20, 1981. p. 78.
  14. ^ Johnson, G.R.; Mueller, R.A. (January 1977). "Automated Generation of Cross-System Software for Microcomputers". Computer. 10 (1): 23–31. doi:10.1109/c-m.1977.217493. ISSN 0018-9162.