PDP-11 Processor features/options (was HELP PDP-11 instruction) - TUHS

11 May 2000

I have updated my web page, fixing a few typos, and made more distinctions
between various processors, along with a table of 'obscure instructions'.

	http://www.psych.usyd.edu.au/pdp-11/table.html

Does anyone out there know the internal implementation details of the J11
chip. I assume it's micro sequenced, but what is the micro word length?

PS

I have found the 'PDP-11 Family Differences Table' (in the PDP-11 Architecture
Handbook and others) to be wrong in several places.

						Regards John

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 From Johnny Billquist &lt;bqt(a)Update.UU.SE&gt; Thu May
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From: Johnny Billquist &lt;bqt(a)Update.UU.SE&gt;
To: Tim Shoppa &lt;SHOPPA(a)trailing-edge.com&gt;
cc: PUPS(a)minnie.cs.adfa.edu.au
Subject: Re: Help: PDP-11 instruction classification (again!)
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On Wed, 10 May 2000, Tim Shoppa wrote:

...
  J11 = KDJ-11A
or KDJ-11B  
 And lots of other systems.  Some DEC peripherals (most noticably the
 early HSC storage controllers for VAXclusters) have J11's, several Xerox
 laserprinters used J11's, DEC PRO380's used J11's.  Many third-party
 CPU boards use J11's, it's not unusual to see them scrounging the used
 market for HSC's to strip the J11 from, as the HSC's generally had late-rev
 J11's.  (And Harris hasn't made the J11 chips for many years now.) 
Actually, the first HSCs (HSC-50 and HSC-70) have an F11. Hmmm, a bit
unsure about the HSC-70 come to think of it. The HSC-50 is definitely F-11
anyway, and that's the oldest one. Boots of DECtape II. Slow as hell
because of it. :-)

...
  You can find T11 chips in several Q-bus and Unibus
peripherals, most notably
 the RQDX1, 2, and 3 (the chip labeled "27-17311-01"). 
What cpu is in the DEUNA and DEQNA? I think those also have a T11.

...
  The CPU chipset used in the LSI-11/02 and /03 is a
Western Digital chipset,
 and the same set was used (with different microcode) by other CPU makers.
 In particular, the Alpha Micro two-board S-100 set. 
And I think DEC even supported the possibility of writing your own
microcode for this one.

	Johnny

Johnny Billquist                  || "I'm on a bus
                                  ||  on a psychedelic trip
email: bqt(a)update.uu.se           ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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 From lars brinkhoff &lt;lars(a)nocrew.org&gt; Thu May 11
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To: pups(a)minnie.cs.adfa.edu.au
Subject: Obscure opcodes
From: lars brinkhoff &lt;lars(a)nocrew.org&gt;
Date: 11 May 2000 08:20:51 +0200
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Does anyone know that bit patterns these instructions use:
        commercial instruction set,
        FADD, FDIV, FMUL, FDIV, (and any other FIS instructions if any),
        LDUB, MED, XFC
?

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 From Roger Ivie &lt;rivie(a)teraglobal.com&gt; Thu May 11
22:03:35 2000 
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From: Roger Ivie &lt;rivie(a)teraglobal.com&gt;
Subject: Re: Obscure opcodes
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...
 Does anyone know that bit patterns these instructions
use:
        commercial instruction set, 
According to the PDP11/04/34a/44/60/70 processor handbook
(1979-1980),

addn 076050
addp 076070
addni 076150
addpi 076170

ashn 076056
ashp 076076
ashni 076156
ashpi 076176

cmpc 076044
cmpci 076144

cmpn 076052
cmpp 076072
cmpni 076152
cmppi 076172

cvtln 076057
cvtlp 076077
cvtlni 076157
cvtlpi 076177

cvtnl 076053
cvtpl 076073
cvtnli 076153
cvtpli 076173

cvtnp 076055
cvtpn 076054
cvtnpi 076155
cvtpni 076154

divp 076075
divpi 076175

locc 076040
locci 076140

l2dr 07602r

l3dr 07606r

matc 076045
matci 076145

movc 076030
movci 076130

movrc 076031
movrci 076131

movtc 076032
movtci 076132

mulp 076074
mulpi 076174

scanc 076042
scanci 076142

skpc 076041
skpci 076141

spanc 076043
spanci 076143

subn 076051
subp 076071
subni 076151
subpi 076171

...
         FADD, FDIV, FMUL, FDIV, (and any other FIS
instructions if any), 
According to Microcomputer Handbook (1977-1978):

fadd 07500r
fsub 07501r
fmul 07502r
fdiv 07503r

and those are the only instructions listed under FIS.

...
         LDUB, MED, XFC
? 
Back to 11/04/34a/44/60/70:

med 076600
ldub 170003
xfc 0767xy
  - x = "used for initial instruction group determination",
  - y = "further instruction determination"
     (this is a user-defined instruction via writable microcode in the 11/60).

-- 
Roger Ivie
TeraGlobal Communications Corporation
1750 North Research Park Way
North Logan, UT 84341
Phone: (435)787-0555
Fax: (435)787-0516

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 From Tim Shoppa &lt;SHOPPA(a)trailing-edge.com&gt; Thu
May 11 22:37:50 2000 
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...
 >        LDUB, MED, XFC
>? 
...
 Back to 11/04/34a/44/60/70:

med 076600 
The MED instruction is used in RT-11 to determine if the machine is an
11/60.  It's probably also used in the 11/60-specific XXDP diagnostics.
I don't think that it's used in any of the -11 Unices.

Note that MED is really a two-word-long instruction.

...
 ldub 170003 
My 11/60 Processor Handbook also lists MNS (170004), MNP (170005), and
MAS (170006).  These are "11/60 FP11-E Maintenance Instructions" and
"This set together with the LDUB instruction should be used for diagnostic
purposes only" according to the 11/60 book.

Note that no version of DEC MACRO-11 recognizes MNS, MNP, MAS, or LDUB.

The MED instruction is recognized in MACRO-11 only as MED6X.  The "6X"
jibes with the rumored existence of experimental variants on the 11/60
processor, one of which is the multi-processor 11/64.

-- 
 Tim Shoppa                        Email: shoppa(a)trailing-edge.com
 Trailing Edge Technology          WWW:   http://www.trailing-edge.com/
 7328 Bradley Blvd		   Voice: 301-767-5917
 Bethesda, MD, USA 20817           Fax:   301-767-5927

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 From lars brinkhoff &lt;lars(a)nocrew.org&gt; Thu May 11
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To: pups(a)minnie.cs.adfa.edu.au
Subject: Re: Obscure opcodes
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&lt;v04210103b5404dc720f4(a)[10.10.50.26]&gt;
From: lars brinkhoff &lt;lars(a)nocrew.org&gt;
Date: 11 May 2000 14:37:48 +0200
In-Reply-To: Roger Ivie's message of "Thu, 11 May 2000 06:03:35 -0600"
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Thank you all, now I have all the opcode information I need!

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