View source for MX15-A Memory Bus Multiplexer

The '''MX15-A Memory Bus Multiplexer''' is a [[PDP-15]] sub-system which has three [[memory bus]] input ports, and one output port, which can be connected to 32K [[word]]s of [[core memory|core]] [[main memory]]. PDP-15 [[Central Processing Unit|CPU]]'s and [[Direct Memory Access|DMA]] [[peripheral]]s can be connected to the input ports. A PDP-15 CPU can be connected to up to four MX15-A's; thus, the total memory provided to it can be up to 128K words.

The MX15-A allows the input ports access to the main memory on a priority basis; port 1 has the highest priority, and port 3 has the lowest.

==External links==

* [http://bitsavers.org/pdf/dec/pdp15/hardware/DEC-15-H2XB-D_MX15_Aug71.pdf MX15 Memory Bus Multiplexer Maintenance Manual Volume 1] (DEC-15-H2XB-D)
* [http://bitsavers.org/pdf/dec/pdp15/hardware/DEC-15-H2XB-D_MX15_EngrDrws_Sep71.pdf MX15 Memory Bus Multiplexer Maintenance Manual Volume 2 - Engineering Drawings] (DEC-15-H2XB-D)

[[Category: PDP-15s]]