View source for UNIBUS boot ROMs

DEC produced several generations of '''[[UNIBUS]] [[Read-only memory|ROM]] boot''' cards.

* The first was the [[BM792 ROM]] [[DEC card form factor‎|quad]] card, which plugged into an [[Small Peripheral Controller|SPC]] slot; it used individual diodes in an array to represent individual bits, and contained only 32 words of memory.

* The second was the [[BM873 ROM]], also a quad card used in an SPC slot; it contains 128 words, using 2 [[PROM]] chips.

* The third was the [[M9301 ROM]] card, a dual card intended for use in the top two rows of a [[Modified UNIBUS Device|MUD]] slot; it had a capacity of 512 words, using four chips like those in the BM873.

* The last was the [[M9312 ROM]] card, which also had a capacity of 512 words.

In both of the latter two cards, the entire ROM contents were directly visible on the UNIBUS, not through a window, unlike later, larger [[QBUS]] ROM cards.

[[Category: UNIBUS ROMs]]