DEC T-11

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Die shot of DEC T-11

The T-11, also known as DC310 or DCT11, is a microprocessor that implements the PDP-11 instruction set architecture (ISA) developed by Digital Equipment Corporation. The T-11 was code-named "Tiny". It was developed for embedded systems and was the first single-chip microprocessor developed by DEC. Going into volume production in early 1982,[1] it was sold openly and was used by DEC in disk controllers (Eg: M8639 RQDX2 controller), the VT240 terminal, auxiliary processors and in the Atari System 2 arcade game system. It operated at 7.5 MHz or 10 MHz (three versions, two speeds), used a 5 V power supply and dissipated 1.1 W maximum. It contained 13,000 transistors, used NMOS logic, and was fabricated in a NMOS process. By 1987, three versions of the DCT11 were available: 21-17311-01 (original 7.5 MHz version, produced by DEC), 21-17311-00 (second source, 7.5 MHz, from Synertek), and 21-17311-02 (10 MHz version, produced by DEC).[2]

A clone of the T-11 was manufactured in the Soviet Union under the designation KR1807VM1 (Russian: КР1807ВМ1).[3]


  1. ^ "T-11 Engineering Specification" (PDF). March 24, 1982.
  2. ^ Semiconductor Databook, Volume 1 (PDF). Digital Equipment Corporation, Semiconductor Operations. 1987.
  3. ^ "Soviet microprocessors, microcontrollers, FPU chips and their western analogs". CPU-world. Retrieved 24 March 2016.
  • Olsen, R., Dobberpuhl, D. (1981). "A 13,000 transistor NMOS microprocessor". International Solid-State Circuits Conference Digest of Technical Papers. pp. 108–109.