Modifications (Ian Hayes)

17ind.s:	26aug80	check for stack overflow when loading large
	things on stack
30atof.s:	25aug80	check for overflow when reading in the exponent
30io.s:	29aug80	catch attempts to access file buffer var at eof
30io.s:	29aug80	GET used to stuff up the sync by doing iosync after get
30io.s:	19jul79	mov sp,-(sp) does different things on different machines
30iosubs.s:	29aug80	blank file buf var at eof on a text file
30iosubs.s:103:	bit	$EOF,FUNIT(r1)	/ mod ianh 29aug80 test for read past eof
30iosubs.s:	29aug80	check for read past eof on get
34fun.s:	28aug80	fix dispose to throw away length, call pfree with
	appropriate argument, and clear disposed pointer
exit.c:	20jul79	leave out gathering of statistics
malloc.c:	28aug80	"malloc.c" was borrowed from the VAX px and incorporated
	into the PDP11 px to implement dispose, it needed 2 minor mods,
	1 to fix a bug in test for memory overflow that rarely occurs anyway,
	2 to adjust the stklim for stack overflow checking
palloc.c:	26aug80	three bugs in one line setting the stack limit
	1. buffer area of 512 bytes not enough on our system try 22*64
	2. it did round up to a 4K byte boundary it should have been 8K
	3. the upper limit it rounds up should be the high of memory
		allocated to px, not what px has allocated to the Pascal pgm.
		So memptr should be "high" or with malloc sbrk(0)
palloc.c:	28aug80	the following routines palloc and pfree were borrowed
	from the VAX px to implement new and dispose decently
	all calls to alloc and free were modified to call
	palloc and pfree
