KD11-E/EA microcode flow diagrams

Noel Chiappa jnc at mercury.lcs.mit.edu
Sat Jan 5 17:35:38 CST 2019


The copy of the KD11-EA engineering drawings (in the 11/34A Field Maintenance
Print Set, MP-00190) on Bitsavers is missing most of the pages that hold the
microcode flow diagrams. I have a set of the KD11-EA FMPS (MP-00192), which
does have all the missing pages, which I can eventually scan. However, in the
interim, the 11/34 Field Maintenance Print Set Vol. 2 (MP-00082) on Bitsavers
has a complete set of microcode flow diagrams for the KD11-E (pp. 15-40 of the
PDF), and they are almost identical to the KD11-EA diagrams.

The only difference I can see (I compared page by page, to see if each page
had the same microinstructions on it) is that on sheet 17; the last
microinstruction for RTI/RTT has been moved from 002 -> 744. (The actual
microinstruction contents seem to be the same.)

I don't know whyo the changed address; I originally thought that perhaps they
had to re-do the IR Decode ROMs when they added floating point, and they
needed the original location to handle the start of the floating point
microcode, but that doesn't seem to be the case.

	Noel


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