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M8186 CPU

The KDF11-A CPU is dual-width PDP-11 CPU card for the QBUS; it uses the same 'Fonz' F-11 chip set as the other KDF11 CPUs.

It contains only the basic CPU, unlike the other KDF-11's: no ROM, no asynchronous serial lines, etc. It does support the optional KTF11-A memory management chip and the KEF11-A floating point chip, but not the KEF11-B PDP-11 Commercial Instruction Set (CIS).

The first version of the KDF11-A (Revision A) only suppported 256 Kbytes of main memory; later versions supported up to 4 Mbytes.