Conversational Access to a 2048-Word Machine

LAP6 is an on-line system running on a 2048-word LINC which provides full 
facilities for text editing, automatic filing and file maintenance, and 
program preparation and assembly.  It focuses on the preparation and editing 
of continuously displayed 23,040-character text strings (manuscripts) which
can be positioned anywhere by the user and edited by simply adding
and deleting lines as though working directly on an elastic scroll.
Other features are available through a uniform command set which itself can 
be augmented by the user.  The machine, although small,
aids program design by providing display scope and premarked
randomly addressable LINC tapes as standard items, in an environment
similar to that of a sophisticated terminal.  The tapes are logically 
similar to a disk.  Priority was given to the design of efficient
tape algorithms to minimize the limitations of the small memory.  Techniques 
developed for handling scroll editing, filing, and the layered system 
structure are outlined.  LAP6 is used by about 2000 people in 11 countries.  
Its design was strongly influenced by performance criteria established in 
interviews held with LINC users themselves during the specification period.

CACM July, 1970

Wilkes, M. A.

conversational computer access,
display editing, display oriented system, filing algorithms, LAP6,
layering, LINC, man-machine communication, on-line editing, on-line efficiency,
on-line environment, scroll editing, small machine system, tape filing, tape 
oriented system, text editing

3.73 4.10 4.11 4.19 4.22 4.30 4.40 4.41

CA700702 JB February 13, 1978  9:35 AM

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