🚀 go-pugleaf

In article <1k6e6cINNmqo@bigboote.WPI.EDU>, bugsy@yoyodyne.WPI.EDU (Christopher Sean Moran) writes:
|>Help me... I have a program called VORLAX which I need to compile.
|>It was written and compiled originally on CDC FORTRAN IV.  All
|>I have access to is Unix f77.  I have tried to compile it, but
|>its a no go.  One problem is the first line
|>
|>PROGRAM VORLAX(INPUT,OUTPUT, etc)
|>
|>the compiler doesnt like the parenthesis after the program 
|>declaration.  Past that there are no other problems.

Ah, good old days!  The parenthesis above were a CDC extension
providing a sort of i/o redirection.  You could run the program by
something like
VORLAX,FOO,BAR.
which worked as vorlax < foo > bar would work on Unix.
But you could redirect many files with arbitrary fortran unit
numbers.

|>I do get an executable after compiling if I take the stuff
|>in the parenthesis out. But UNIX dumps my core every time
|>I run the program.  Can anyone help me?

As opposed to Fortran 90 vs Fortran 77, Fortran 77 is not downward 
compatible with Fortran 66 (CDC's FORTRAN IV is Fortran 66).
In particular, DO loops behave in a different way, and in Fortran 66
they are *always* executed at least once. So that
      A=0.
      DO 100 I=2,1
      A = A + 1.
100   CONTINUE
      B = B/A
would run fine with Fortran 66 but dump your core with Fortran 77.
Many compilers have an option to force the old-style behavior; look
for -onetrip or something like that.

Of course, your program may dump for other reasons.  The CDC was
a 60 (sic) bits machine using a 6-bit (ugh) character set, not ASCII,
so the potential for breakdowns related to COMMONs, EQUIVALENCEs,
characters stored in reals ... etc are huge.  I would suggest to check
accurately everything dealing with character manipulation.  As in
Fortran 66 there was no CHARACTER type, this is kinda fun. :-)
Good luck!
furio  
--
furio ercolessi    <furio@uiuc.edu>*    <furio@sissa.it>+
* materials research lab, uni illinois at urbana-champaign
+ intl school for advanced studies, trieste, italy   

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