Editing PDP-11/20 Documentation (section)

== MM11-E Core Memory Manual (DEC-11-HR3A-D) ==
DEC's manual for the 4K-word core memory of the basic 11/20, first printing August 1970, 43 pages scanned.<ref name="mm" /> Chapter 1 introduces the memory, chapter 2 gives the theory of operation of the core array, drivers, sense amplifiers and timing, and chapter 3 covers maintenance: the V REF, V SLICE and STROBE DEL adjustments (Table 3-1, p. 3-1), the sense, inhibit and drive waveforms with failure waveforms dotted in (Figures 3-2 and 3-3), and a troubleshooting chart of symptoms, causes and corrective actions (Table 3-2). Chapter 4 holds the engineering drawings.<ref name="mm" />

<pdf width="800" height="500">File:MM11-E Core Memory Manual (DEC-11-HR3A-D).pdf</pdf>

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