Where the Pascal-U compiler (1976) implements a subset of Standard Pascal, Pascal-VU (1979) implements full ISO Standard Pascal.

The Pascal‐VU compiler produces code for an EM1 machine. There does not exist a hardware EM1 machine. Therefore, EM1 programs must be interpreted, or translated into instructions for a target machine. The following implementations exist:

• an interpreter running on a PDP‐11 (using UNIX‐6). Normally the interpreter performs some tests to detect undefined integers, integer overflow, range errors, etc. However, one of the options of the interpreter is to skip these tests.
• a translator into PDP‐11 instructions (using UNIX‐6).

Pascal-VU June 1980 si afound on a tape dump https://www.tuhs.org/Archive/Applications/Shoppa_Tapes/usenix_80_delaware.tar.gz in the folder ‘tanenbaum’.

The header of the Pascal-VU compiler source

program pem(input,output,em1);
{This Pascal compiler  produces EM1 code as described in
   - A.S.Tanenbaum, J.W.Stevenson & H. van Staveren,
	"Description of a experimental machine architecture for use of
	 block structured languages" Informatika rapport xx.
  A description of Pascal is given in
   - K.Jensen & N.Wirth, "PASCAL user manual and report", Springer-Verlag.
  Several options may be given in the normal pascal way. Moreover,
  a positive number may be used instead of + and -. The options are:
	a:	interpret assertions (+);
	c:	C-type strings allowed (-);
	i:	controls the number of bits in integer sets (16);
	l:	insert code to keep track of source lines (+);
	o:	optimize (+);
	r:	check subranges (+);
	s:	accept only standard pascal programs (-);
	t:	trace procedure entry and exit (-);
	v:	produce code for 24 bit addresses (-);
}
{===================================================================}

Downloads

	Pascal-VU Reference manual, 1979
	Pascal-VU Reference manual V2 seems to be a later version
	Pascal-VU June 1980 tape archive + text files
	Pascal-VU compiler test programs
	Source of Pascal-VU compiler
	Source of Pascal-VU compiler EM.h
	Pascal-VU reference manual ISO standard compliance reference
	Description of EM1 Version of 2 March 1979