IBM 1130 User Manual page 686

Computing system

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In step 3, we have prevented overlays from oc-

curring between disk READs/WRITEs. The next

logical step is to eliminate overlays altogether, or,

if that is impossible, limit overlays to LOCALs or

SOCALs that are infrequently called.

Further study of the flowchart reveals that a

master card is somewhat exceptional, even though

every eighth card or so is a master card. Adding D,

E, F, and G to the LOCAL list, we again execute

and find that the program now runs even faster than

before, with disk arm movement only when a master

card is encountered. The load map shows that

SOCALs are no longer required.

*LOCALCOS T, F

FILES ALLOCATION

OOUA (HEX) WDS UNUSED BY CORE LOAD

LIBF TRANSFER VECTOR

SYSTEM SUBROUTINES

104B (HEX) IS THE EXECUTION ADDR

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