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+MC68000/IRAF Installation Notes.
+18 January 1986 (dct)
+-------------------------------------------
+
+The 4.2BSD VAX version of UNIX/IRAF will run almost without change on a MC68000
+based workstation.  In particular, the kernel should not have to be changed.
+The changes which are required are due to machine differences, e.g., in the
+assemblers and machine constants.  The affected files are summarized below.
+This documents only the source changes required for a MC68000, not the full
+installation procedure required before the system can be compiled and run.
+
+host/as/*.s
+	All of the assembler sources are of course different for a VAX and
+	a 68000 based machine.  The various UNIX assemblers for the MC68000
+	UNIX implementations are also different, e.g., in the comment
+	convention, use of $ or # to denote a numeric constant, etc.
+	Despite the differences there are many similarities, and the
+	translation is usually not difficult.  Note that only a couple of
+	assembler sources are required, although half a dozen or so should
+	eventually be implemented for efficiency reasons.
+
+	To modify the AS directory for a MC68000, replace ZSVJMP.S, AMOV.S,
+	etc. with their MC68xxx versions, and remove all other VAX assembler
+	sources which you do not plan to implement (e.g., rename the original
+	AS directory as "vaxas").  Note that only the MC68020 has the bitfield
+	instructions needed for BITUPK.S and BITPAK.S.
+
+host/boot/*
+	No changes should be required.
+
+host/gdev/*
+	No changes should be required, unless new graphics devices have to be
+	interfaced.
+
+host/hlib/clpackage.cl
+	Change the default device names.
+
+host/hlib/mach.h
+host/hlib/[dir]mach.f
+host/hlib/libc/spp.h (EPSILON)
+	Change the machine constants to those for the MC68000.  If the machine
+	has IEEE floating point, these constants are independent of the host
+	operating system (e.g., SUN or ISI).  In <mach.h> only the machine
+	epsilon usually needs to be changed; the values for INDEF, MAX_LONG,
+	etc. the are the same for most modern minicomputers.
+
+	The utility osb$zzeps.f may be used to determine the machine epsilon.
+	The values determined for a SUN/MC68010 with software floating point
+	were the following:
+
+		EPSILONR	(1.192e-7)
+		EPSILOND	(2.220d-16)
+
+	For a MC68xxx, the bytes are not swapped:
+
+		BYTE_SWAP2	NO
+		BYTE_SWAP4	NO
+
+	PORTLIB/[DIR]MACH.F contants:
+
+		(to be determined)
+
+host/hlib/libc/iraf.h
+host/hlib/mkiraf.csh
+host/hlib/irafuser.csh
+	Change the pathnames in these files.
+
+When installing a new version of UNIX/IRAF it is usually best to install the
+new UNIX directories as well, and then modify or replace the above files as
+necessary for the 68000.  All revisions are thus automatically picked up, and
+the modifications required for the 68000 are minor.