Quantum Effect Devices was a microprocessor design company

The company was acquired on 2000 10 by PMC-Sierra, became the Microprocessor Products Division of PMC was financially conservative during the time. The team completed the RM9x00 product line while at PMC. The company name was attributed to Tom Riordan, believed that the company. That reason is a re-implementation of the 5-stage Classic RISC pipeline with large caches. The initial target market of a MIPS laptop computer materialized never this device was the first RISC processor was used in Midway arcade games in several Atari.

The R4700 was targeted at SGI, was licensed by Toshiba and IDT. This device was used inside low-end workstation inside the SGI Indy, was the first QED device doubled data caches and the instruction to 32 KB, had a limited implementation of superscalar instruction issue. The R4650 was commissioned by NKK, achieved a smaller die area was licensed by NKK and IDT. A different pin-out and smaller caches was a cost-reduced version of the R5000 with a different pin-out and smaller caches. The earlier RM52X0 devices had only 16 KB caches while the later RM52X1 devices. The RM523X devices had 32-bit system buses while RM526X. This product line was very successful in the laser printer market. The RM7000 implemented also symmetric superscalar instruction issue with two integer execution units. The RM7061 device was a pin-compatible upgrade for the RM526X series. These processor cores achieved successfully operating frequency target of 1 GHz. The SOC system interconnect was an in-house design for the transactions with centralized storage.

A second generation device added a Gigabit ethernet controller, cache coherency and a PCI controller. That time had entered already the market with equivalent devices. The deal give PMC, a strong presence in the design of high-speed networks.

Assembly language is a low-level programming language

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