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Manufacturer: Digital Equipment Corporation
Architecture: PDP-10
Year Design Started: January, 1972
Year First Shipped: June, 1975
Form Factor: mainframe
Word Size: 36 bits
Logic Type: ECL ICs
Design Type: clocked synchronous, microcoded
Microword Width: 80
Microcode Length: 1280 (Model A)
2K (Model B)
Clock Speed: 500 nsec
Cache Size: 2K words
Memory Speed: 1.0 μsec (initial core memory), 500 nsec (later MOS main memory)
Physical Address Size: 22 bits
Virtual Address Size: 18 bits (Model A and B)
23 bits (Model E)
Memory Management: paging, 512-word pages
Operating System: TOPS-10, TOPS-20, ITS, WAITS, TENEX, TYMCOM-X
Predecessor(s): KI10
Successor(s): none
Price: US$250K (CPU), US$600K-1.2M (system)

The KL10 was the third generation of PDP-10 processors. It was built out of ECL, on hex cards. It was the first microprogrammed PDP-10 processor; the design was inspired by Foonly's F-1

It was used in the DECsystem-10 models 1080 and 1090 systems (with an external memory bus, compatible with the earlier KA10 and KI10), and the DECSYSTEM-20 20xx systems (with an internal memory bus).

Like its predecessor, the KI10, it was initially released in a single-processor version; a two-CPU version was released later.

There was a single KL10 ITS machine, MIT-MC. It was later renamed to MX and was shut down in 1988. There was also a KL10 in the Stanford WAITS system.

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