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diff --git a/unix/mc68000/zsvjmp.FX b/unix/mc68000/zsvjmp.FX
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+|# ZSVJMP, ZDOJMP -- Set up a jump (non-local goto) by saving the processor
+|# registers in the buffer jmpbuf.  A subsequent call to ZDOJMP restores
+|# the registers, effecting a call in the context of the procedure which
+|# originally called ZSVJMP, but with the new status code.  These are Fortran
+|# callable procedures.
+|#
+|# (Alliant/UNIX MC68xxx version)
+ 
+        .text
+        .globl  _zsvjmp_
+        .globl  _zdojmp_
+
+	|# The following has nothing to do with ZSVJMP, and is included here
+	|# only because this assembler module is loaded with every process.
+	|# This code sets the value of the symbol MEM (the Mem common) to zero,
+	|# setting the origin for IRAF pointers to zero rather than some
+	|# arbitrary value, and ensuring that the MEM common is aligned for
+	|# all datatypes as well as page aligned.  A further advantage is that
+	|# references to NULL pointers will cause a memory violation.
+
+	.globl	_mem_
+	_mem_	=	0
+
+_zsvjmp_:				|# call zsvjmp (jmpbuf, status)
+	movl	a0@(4), sp@-		|# save pointer to status variable
+	movl	a0@, sp@-		|# save pointer to jmpbuf
+
+	movl	a0@, sp@-		|# call alliant setcontext proc
+	movl	sp, a0
+	pea	1
+	jsr	_setcontext
+	addql	#8, sp
+
+	movl	sp@+, a0		|# A0 = &jmpbuf
+	movl	sp@+, a1		|# A1 = &status
+
+	movl	a1, a0@(2240)		|# save &status in jmpbuf
+	clrl	a1@			|# set status to zero
+	lea	sp@(4), a1
+	movl	a1, a0@(68)
+	movl	sp@, a0@(74)
+	rts
+
+_zdojmp_:
+	movl	a0@, a1			|# A1 = &jmpbuf
+	movl	a1@(2240), a2		|# A2 = &status
+	movl	a0@(4), a3		|# pointer to status value
+	movl	a3@, a2@		|# set status value
+	jsr	_resetcontext