There are four varieties of Scheme available on Athena at the moment.

Program		Description

Scheme 7.0	This is the standard scheme used by the MIT scheme
locker: 	development group.  It abides by the standards of
   scheme-7.0	scheme as set forth in the "Revised Revised Revised
		Report on Scheme" otherwise known as R3RS (the latex
		source for this document can be found in 
		/mit/scheme-7.0/dist/documentation/r3rs/) and includes
		many more features that are standard to MIT CScheme.
		Among major features of this version are a vax native
		code compiler and an X window interface package. It is
		available on VAXen, RT's and DECStations.
		THIS IS THE SCHEME OF CHOICE FOR GENERAL USE.

6.001 Scheme	This Scheme is based on Version 7.0 Scheme with
locker:		a special band loaded for 6.001 Scheme compatibility.
   scheme-7.0	The compatibility package is more up to date than the
		version in the scheme locker, and includes graphics.
		THIS PACKAGES HAS NOT BEEN FULLY TESTED, IT MAY
		CONTAIN UNKNOWN BUGS.


Scheme 6.1	This is the old standard scheme.  It abides by the
locker: 	standards of scheme as set forth in the "Revised
   scheme	Revised Revised Report on Scheme" otherwise known as
		R3RS (the latex source for this document can be found
		in /mit/scheme/dist/documentation/r3rs/) and includes
		many more features that are standard to MIT CScheme.
		This version is only available on VAXen. 
		THIS SCHEME IS OUT OF DATE AND SHOULD NOT BE USED.


scm6001	(6.1)	This scheme is meant to be compatible with the scheme
locker:		used in teaching 6.001, but it is out of date.  It is 
   scheme	not R3RS compatible. It is based on the Version 6.1 of
		Scheme and only available on VAXen.
		

scm6003		This scheme is a carbon copy of the scheme as used in
locker:		6.003 for the first half of the term (Spring '88).  It
   scheme	does not include the Signal Handling Environment
		(SHE). This scheme includes the Complex Numbers
		package and other number handling procedures that can
		be very useful at times.  This package also includes a
		X version of the HP Starbase graphics package.  This
		was last updated in Fall of '88 so any changes to the
		6.003 system after that are not in this scheme.  This
		implementation is based on Version 6.1 of Scheme and
		is only available on VAXen.

she6003		This is the 6.003 scheme with the SHE package.  It
locker:		was last updated in Spring '88.  It also contains
   scheme	the Starbase graphics package.  This is actually just
		the same as scm6003 with a different band loaded.
		This also is based on Version 6.1 of Scheme and is
		only available on VAXen.