UNIBUS boot ROMs: Difference between revisions
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There was also a specialized card for use in the [[PDP-11/40]] machines, | There was also a specialized card for use in the [[PDP-11/40]] machines, | ||
the [[ | the [[M873-YA]]. | ||
Revision as of 18:13, 26 March 2016
DEC produced three generations of UNIBUS ROM boot cards.
The first was the BM792 ROM card, which used individual diodes in an array to represent individual bits; it contained only 32 words of memory. The second was the M9301 ROM card; it had a capacity of 512 words, using PROM chips. The third 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.
There was also a specialized card for use in the PDP-11/40 machines, the M873-YA.
