MA10 core memory

The MA-10 was a main memory system for the early PDP-10s, principally the KA10. An MA10 contained 16KW, and had a cycle time of 1.0 µseconds. It connected to the so-called external memory bus of the 18-bit address form.

It was a multi-port memory, with 4 ports per memory system: the CPU uses one port (in a multi-processor system, one per CPU); the others are used by channels (such as a DF10) for mass storage such as disks.

Each port could be independently set for interleaving, using address bits 21 and 35.