DEC, Digital Equipment Corp.

M105 FLIP-CHIP Address Selector (for PDP11 use)

This is unused and in the original box (see pics).

The one you buy, is still in its original box because we would damage the box trying to get it out for a pic.

The first pic is of a diff PCB that did not have an original box.

It is Gov Surplus from a WhiteSandsNM black site.

The M105 Address Selector is a DEC FLIP CHIP which implements the 'address selection' function (i.e. detecting when a particular bus cycle is destined for a particular device) for the UNIBUS. It was used, along with an M782 Interrupt Control, in early PDP-11 device controllers which plugged into an SPC slot.

It was also used in a number of early devices which were built out of a custom backplane and a large number of FLIP CHIPs, such as the RK11-C. Some later devices which no longer used a large number of small Flip Chips (such as the TMB11) also used it. The board contained a number of jumper wires which could be use to set the address to be recognized; the jumpers apply to UNIBUS address bits 3-12. The M105 recognizes any address within a eight byte block; if a device needs more than 4 word registers, the M105 cannot accomplish that.

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