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To modify SCHEME code in the runtime system:

The released SCHEME sources are in SRC:<scheme.scm.released>.

For example, we may change garith.scm

Edited changes may be made to them and the resulting code should be
placed in SRC:<scheme.scm>.  Be careful to use the next consecutive
version number for that file.

This code must be syntaxed using the 20SCHEME as described in
BUILD-BAND.


The version number of the file constructed must be installed in the
list of files accessed by START.SCM.  This, in turn, is accessed by
COLD.SCM.  Thus any change to the runtime system requires these two
additional changes.