Difference between revisions of "KDJ11-A CPU"

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Revision as of 15:19, 2 June 2016

KDJ11-A CPU

The KDJ11-A CPU board (M8192) is the first QBUS CPU card using the J-11 chip of the PDP-11. It is a dual-height board, and is used in PDP-11/73 systems.

It contains an 8K-byte write-through cache (set size 1, block size 1 16-bit word), protected by parity; cache control logic inspects DMA transfers and invalidates cache entries for memory which is written to by a device.

It also provides a set of diagnostic LEDs, and a Line Time Clock; but no other devices (boot PROM, serial line, etc).

Although the J-11 does implement FP11 floating-point, the board can use the FPJ11 Floating Point Accelerator (note that only the -YB version of the board operates correctly with the FPJ11).