Xerox Alto I - Page 11

Alto Hardware Manual
Simple
Simple
Simple
fetch:
Alto I
MAR+-ANY;
REQUIRED;
SUSPEND;
SUSPEND;
whereever+- MD;
store:
Alto I
MAR+-ANY;
REQUIRED;
SUSPEND;
SUSPEND;
MD+-whatever;
store, followed
Alto I
MAR+-ANY;
REQUIRED;
SUSPEND;
SUSPEND;
MD+-whatever;
MAR+-ANY;
Double-word fetch:
Alto I
MAR+-EVEN;
REQUIRED;
SUSPEND;
SUSPEND;
whereever+- MD;
whereever+- MD;
Alto II
MAR+-ANY;
REQUIRED;
SUSPEND;
SUSPEND;
whereever+- MD;
Alto II
MAR+-ANY;
REQUIRED;
OPTIONAL;
MD+-whatever;
immediately by another
Alto
II
MAR+-ANY;
REQUIRED;
REQUIRED;
MD+- whatever;
SUSPEND;
MAR+-At-.'Y;
Alto II
MAR+-ANY;
REQUIRED;
$USPEND;
SUSPEND;
whereever+- MD;
whereever+-MD;
Double-word store/fetch:
Alto I
MAR+-EVEN;
REQUIRED;
SUSPEND;
SUSPEND;
MD+-whatever;
whereever+- MD;
Alto II
MAR+-ANY;
REQUIRED;
SUSPEND;
MD+-whatever;
whereever+- MD;
Double-word store (only on modified Alto Is):
Alto I Alto
II
MAR+-EVEN;
REQUIRED;
SUSPEND;
MAR +- Al\'Y;
REQUIRED;
MD+- whatever;
Section 2: Microprocessor
memory cycle:
Alto
II
MAR+-ANY;
REQUIRED;
MD+-whatever;
SUSPEND;
SUSPEND;
MAR+-ANY;
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