MIL MF7114 microprocessor

Dublin Core

Title

MIL MF7114 microprocessor

Subject

hardware: integrated circuits

Description

The MF7114 was an early 4-bit single-chip microprocessor designed and built by Microsystems International Ltd. (MIL) between 1970 and 1972. It was the first microprocessor designed and manufactured in Canada.

The MF7114's  has its roots in the development of Intel's first single-chip central processing unit (CPU) -- the 4004. Before it was given the `MF7114' designation, the chip's general architecture was called the Intel 4005 and the purpose of its development was to backup the 4004's project, to fabricate a simpler general-purpose microprocessor in case of the 4004's fiasco.

When in early 1971 the design work on the 4004 chip resulted in silicon wafers with a sufficient number of fully-functional CPUs on them to permit the chips' fabrication at the target cost, Intel abandoned the 4005 project. MIL on the other hand, continued the 4005's development and, by mid 1972, had its own 4-bit microprocessor -- the MF7114.

MIL marketed the MF7114 as a CPU for stored program controllers.  In 1973, the company designed an MF7114-based  controller board to demonstrate the use of the chip
to control the Singer Telerex 30  PMI Matrix Printer.

The company also used the MF7114 to design a 4-bit microcomputer -- the CPS-1 (also referred to as the CPS/1, MPS/1, and MC-1). The computer was offered in two  versions. The first one was a single-board version. The board included the MF7114 CPU, clock, 4Kb of memory, and 16 I/O ports including a TTY interface. The second version was a  modularly designed hardware that included a chassis with backplane bus for system's expansions, a CPU and memory board, a power supply, a programmer's console, and the PROM connector to the PROM programmer. The CPS-1 designed in 1973 was the first microprocessor powered computer built in Canada.

The MF7114 Specifications

  • data bus - 4 bit, bi-directional
  • address bus - 12 bit
  • communications bus: (COMBUS) 21 bit, included 16 lines of data and address buses plus 5 control lines
  • clock speed: 0.9 microseconds per cycle
  • on-chip registers: accumulator (AC, 4 bit), program counter (PC, 12 bit), data pointer (DP, 12 bit), overflow register (OF, 1 bit)
  • virtual (working) registers: eight 4-bit and eight 12 bit registers
  • number of instructions: 58, executed in three to five cycles
  • supporting chips: the MF1601 ROM and MF7115 RAM
  • packaging: 24-pin DIP

References:

  • MF8008 Central Processor Applications Manual, MIL,
    Bulletin 80007, 1974.
  • Stachniak, Z. The MIL MF7114 Microprocessor. IEEE Annals of the History of Computing,October-December 2010 (vol. 32 no. 4) pp. 48-59.
  • MIL CPS-1 Emulator: Design Notes and Programmer's Guide, Version 2.2, York University Computer Museum, 2021.

Creator

Microsystems International Ltd. (MIL)

Date

1971-1975

Contributor

John Freeman, John Hackman, Kelly Hamilton, and Zbigniew Stachniak

Contribution Form

Online Submission

No

Files

MIL MP-1 Chipset

Tags

Citation

Microsystems International Ltd. (MIL), “MIL MF7114 microprocessor,” York University Computer Museum Canada, accessed July 5, 2022, https://museum.eecs.yorku.ca/items/show/117.

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