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1989-07-29
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Subject: Methods Of Running GFA Programs
By: James Collett (Professor)
A Member Of: VIRTUAL INFINITY
Email: s6005146@oxpoly.ac.uk (or s6005146@brookes.ac.uk)
Address: Room N4, L.S.C.Collage, Wheatley, Oxford, OX9 1HX
Mono accnt.: bcc
Interpreting And Compiling
==========================
Source code is not in a form that the ST`s 68000 processor, or any
machine`s processor, can execute (or run). In order to process, the
source code must be converted into 'executable code', called machine
code.
When you normally Run, from the editor, GFA 'Interprets' the source
code into machine code for the processor source line by source line, and
'gives' it to the processor in 'pieces'. When you run the first line is
interpreted and executed, then the second, then the third and so on.
The disadvantage of this is the interpreting 'gets in the way of' the
run-time and slows the processor down. The solution to this is convert
the entire source code into 'executable code', store this and run it
separately instead of doing both conversion and execution in one go.
This is called 'Compiling' the source code into executable code, which
can then be run without an interpreter from the GEM Desktop!
The GFA editor comes with an interpreter built in. But in order to
convert your sources into stand-alone programs, a GFA compiler has to be
obtained separately from GFA Media:
Address: GFA Data Media (UK) Ltd
Box 121
Wokingham
Berkshire
RG11 5XT
U.K.
Tel: 44 (0)734 794941 } Sales
Fax: 44 (0)734 890782 } Only
Note you ideally need exactly the same version compiler as
interpreter. (For example I use version 3.5e interpreter and 3.5e
compiler.)
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