Models and Technical Evolution
The original PDP-10 processor was the KA10, introduced in 1968. It used discrete transistors packaged in DEC's Flip-Chip technology, with backplanes wire wrapped via a semi-automated manufacturing process. Its cycle time was 1 μs and its add time 2.1 μs. In 1973, the KA10 was replaced by the KI10, which used TTL SSI. This was joined in 1975 by the higher-performance KL10 (later faster variants), which was built from ECL, was microprogrammed, and had cache memory. A smaller, less expensive model, the KS10, was introduced in 1978, using TTL and Am2901 bit-slice components and including the PDP-11 Unibus to connect peripherals.
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