Original DEC DZV11 M7957 Asynchronous Multiplexer Plug-in Card For PDP-11

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This is an extremely rare, vintage Digital Equipment Corporation (DEC) DZV11 M7957 asynchronous multiplexer plug-in card (asyn MUX) for use with PDP-11 machines with the LSI-11 processor and QBUS. The DZV11 provides an interface between an LSI-11 processor and four asynchronous serial data communication channels. It can be used with the LSI-11 processor in a variety of applications that include data concentration, real time processing and cluster controlling.

The DZV11 provides an EIA RS232C interface and enough data set control to permit dial-up (auto answer) operation with modems capable of full-duplex operation. Remote operation over private lines for full-duplex point to point or full-duplex multipoint as a control (master) station is also possible.

Although this card was removed from a working PDP-11/03, we are no longer able to test it. Sold as a vintage/collectible item, functionality is not guaranteed. Sold AS IS, no returns or exchanges. The photo shows the actual item. Bare card only, no cables, testers, documentation or software is included. User\'s guides and technical manuals are available in PDF format and can be sent via email, if desired.

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