Ah, thanks for the clarification on the two Fortran versions. I'm surprised that Fortran II did not use the FPP (we did not use Fortran as it was not oriented to a real time control operation).
Yes, SABR did some weird stuff in its original form which is why we modded it to keep the auto paging feature only.
One reason in particular why I made my query about SABR on this forum is that I submitted my SABR mods to DECUS (?) (the DEC users' group?) and it apparently received little or no interest/feedback. That surprised me because we had found it to be so useful in avoiding unnecessary work especially when adding code to large programs (and, avoiding bugs that might occur by moving code around to fit the available page space plus the resultant spaghetti code).
Good idea BTW on writing code in Fortran and using the assembler code o/p.