Help: PDP-11 instruction classification - TUHS

9 May 2000

I'm adding PDP-11 support to GNU binutils, and I need help on
classifying the instruction set.

I'm somewhat confused, because:

  PDP-11 FAQ says:
  11/45 introduced MUL, DIV, ASH, ASHC, SPL.
  Later, 11/40 introduced SOB, XOR, MARK, SXT, RTT.  MUL, DIV, etc in
  EIS option.

  GCC pdp11.md and pdp11.c says:
  11/40 and 11/45 has SOB, SXT, XOR.
  11/45 has ASHC, MUL, DIV.
  All models has ASH.

  John Holden writes:
  11/40 and 11/45 has EIS and FPU instructions.
  11/40 had several options to add EIS, FIS and a MMU.

Does this mean that an unexpanded 11/40 has no EIS instructions,
but with the EIS option, it has more instructions than an 11/45?

GCC seems to think that all PDP-11 models has ASH, but this seems
wrong.  It's only in EIS, right?

So far, this is the classification I've come up with:

  BASIC: the basic instruction set.
  CIS: commercial instruction set (opcodes 0x7d00..0x7eff).
  EIS45: 11/45 extended instruction set: MUL, DIV, ASH, ASHC, SPL.
  EIS40: 11/40 extended instruction set: EIS45 + SOB, XOR, MARK, SXT, RTT.
  FIS: FADD, FSUB, FMUL, and FDIV (opcodes 0x7a00..0x7bff).
  FPU: LDF, STF, LDCFF', STCFF', CMPF, LDEXP, STEXP, LDCIF, STCFI, MULF,
       MODF, ADDF, SUBF, and DIVF (opcodes 0xf000..0xffff).

Would this be correct?

FIS and CIS isn't imlemented in Supnik's simulator, and I haven't
found any documentation.  Does anyone know more about those?  Why
is there both an FADD and an ADDF instruction?

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From: Warren Toomey &lt;wkt(a)cs.adfa.edu.au&gt;
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Subject: Re: Good news on the Ancient UNIX License front
In-Reply-To: &lt;20000508150240.A7092(a)loomcom.com&gt; from sjm at "May 8, 2000  3:
2:40 pm"
To: sethm(a)loomcom.com (sjm)
Date: Wed, 10 May 2000 09:47:01 +1000 (EST)
Cc: pups(a)minnie.cs.adfa.edu.au (Unix Heritage Society)
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In article by sjm:
...
  Hello all,

 I've just received this mail from SCO.  I think it's appropriate to
 post here.

 Apparently we can expect the Ancient UNIX License available on the
 SCO website by Friday (U.S. Pacific Time, I would suspect).  Very
 good news indeed! 
I'm just back from a training course. I've seen a preview of the web site.
You get to click-thru the license agreement, then you have a set of hyperlinks
to the UNIX versions that SCO owns (5e, 6e, 7e, 32V, SysIII, Mini UNIX).

I'm still trying to work out an access method to the PUPS Archive with them,
but I think we're getting there.

So, you will get access to some UNIX source code soon, but access to the
PUPS Archive might be a week or so longer.

Cheers all!
	Warren

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Subject: Re: PDP land
In-Reply-To: &lt;20000505191242.A13087(a)ussenterprise.ufp.org&gt; from Leo Bicknell at
"May 5, 2000  7:12:42 pm"
To: bicknell(a)ufp.org (Leo Bicknell)
Date: Wed, 10 May 2000 10:27:22 +1000 (EST)
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In article by Leo Bicknell:
...
  	I don't know if you remember me or not.  I
believe we talked
 before when I was a student at Virginia Tech about Unix on a PDP-11/40
 that I had.  Alas, I had to let those machines go as I didn't have
 the time or space to keep them.

 	I went looking for PDP stuff on the web, and ran across your
 name again.  I thought I'd give you a whirl.  I'm now in a position to
 give real data center space to one or more of these beasts, and I would
 love to put a PDP-11 up on the net running old-school unix.

 	Any pointers as to where to find someone giving away or
 selling one of these beasts?

 	Thanks.
 Leo Bicknell - bicknell(a)ufp.org 
Leo, I'm punting this on to the PUPS mailing list to see if you get any
nibbles. Go to http://minnie.cs.adfa.edu.au/PUPS/maillist.html to see
how to join. You could also try the Usenet newsgroups alt.sys.pdp11 and
vmsnet.pdp-11.

Cheers,
	Warren

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