RE: Which DEC machine made use of th pre Flip-Chip board?

[Rich Alderson via cctalk]

From: Noel Chiappa
Sent: Friday, December 21, 2018 5:19 AM

>> From: Mattis Lind

>> I cannot figure out which early machine it comes from.

> They're called 'System Modules':

>   http://gunkies.org/wiki/System_Module

> and they were used from the PDP-1 through (I think) the PDP-7; at least, this
> PDP-7 internals image:

>   
> https://www.soemtron.org/images/jpgs/decimages/sn113robertjohnson85680004.jpg

> seems to show System Modules at the top, and FLIP CHIPs at the bottom. (I'm
> pretty sure even the first PDP-8 - the 'straight 8' - uses only early FLIP
> CHIPs - transistorized ones.)

Noel,

The PDP-7 was the first system produced by DEC which used Flip Chip(TM)
technology, as well as the first to be built using a Gardiner-Denver wirewrap
machine instead of hand soldering.

The System Modules(TM) in the PDP-7 chassis at LCM+L make up the 550 DECtape
control for the 555 DECtape drives.  The controller was common to the PDP-7 and
the earlier PDP-4 (which was of course all System Modules).  They appear in
exactly one place in the entire system.

Rich

Rich Alderson
Vintage Computing Sr. Systems Engineer
Living Computers: Museum + Labs
2245 1st Avenue S
Seattle, WA 98134

mailto:ri...@livingcomputers.org

http://www.LivingComputers.org/

Re: Which DEC machine made use of th pre Flip-Chip board?

[Eric Smith via cctalk]

On Fri, Dec 21, 2018 at 10:37 AM Noel Chiappa via cctalk <
cctalk@classiccmp.org> wrote:

> AFAIK, the first ICs (in the modern sense) on FLIP CHIPS were on M-series.
>

The B198, B199, and B250 modules of the KA10 use ICs. First customer
shipments are claimed to have been in late 1967.
>From something I posted back in 2002, slightly updated:

B198 Protection Comparator (used in KT10, KT10A "memory protection and
relocation" options)

   panel 2MN slot 44, panel 2PR slot 5

   appears to be an 8-bit magnitude comparator
   prints drawn 6-18-68, checked 6/21/68, eng. approval 7/2/68
   5  74H00N
   2  74H40N
   4  74H50N
   1  74H53N
   2  74H55N

B199 FM Address Decoder (used in KM10 "fast registers" option)
   panel 2KL slot 9

   acts as a 4-to-16 decoder (similar to 74154), but
   requires both true and complement inputs
   prints drawn 3-2-67, checked 4/?/67, eng. approval 7/6/67
   8  TI SN7440N or Fairchild 9009 (U6A900959X)

B250 FM Module (used in KM10 "fast registers" option), 8 words by 6 bits
   panel 2KL slots 10-13, 15-18, 20-23
   prints drawn 3-2-67, checked 6/30/67, eng. approval 7/6/67
   6  Fairchild 9030 (U6A903059X)  4 word by 2 bit RAM chip, 45ns
write, 25ns read, 350mW
   13  TI SN7440N or Fairchild 9009 (U6A900959X)

Re: Which DEC machine made use of th pre Flip-Chip board?

[Jon Elson via cctalk]

On 12/21/2018 10:51 AM, Al Kossow via cctalk wrote:


On 12/21/18 5:19 AM, Noel Chiappa via cctalk wrote:


The DEC brochure for it (P5141) is a little puzzling; it says (p. 2) that
"INTEGRATED CIRCUITS are basic elements of the low cost, newly designed
silicon FLIP CHIP modules used throughout PDP-7", but AFAIK, the first FLIP
CHIPs (R-series, B-series, etc) were all transistors; the later M-series were
the first ones to have ICs. Maybe this is some old meaning of "integrated
circuits"?

The original "Flip Chip" was a packaging failure. It was literally a die bonded 
to a PCB
and never went into production.

I think it is mentioned in "Computer Engineering"

IBM perfected the techniques to do this later with the development of solder 
bumps and
IR reflow.
The 360 was announced in 1964, first delivered in 1965, 
using "flip chip" bonding of discrete transistors and diodes 
on ceramic substrates, their "SLT" packaging.  So, I'm not 
too sure about the "later".  The original PDP-8 was 
introduced in 1965.


Jon

Re: Which DEC machine made use of th pre Flip-Chip board?

[William Donzelli via cctalk]

They use the same R and S numbers, just late revision suffices. I have
a machine made with them that sometimes even works. I have a bunch
that have had the gold fingers peeled off (don't blame me - I got them
this way).

--
Will
On Fri, Dec 21, 2018 at 6:26 PM Al Kossow  wrote:
>
> yea, that was it
>
> http://www.computerhistory.org/collections/catalog/XD37.80
>
> I didn't know we had this example in the collection, they were
> hybrids like IBM SLDs
>
> Do you know of any module part numbers that used them?
>
>
> On 12/21/18 2:40 PM, William Donzelli wrote:
> >> The original "Flip Chip" was a packaging failure. It was literally a die 
> >> bonded to a PCB
> >> and never went into production.
> >>
> >> I think it is mentioned in "Computer Engineering"
> >>
> >> IBM perfected the techniques to do this later with the development of 
> >> solder bumps and
> >> IR reflow.
> >
> > Are you talking about the little black rectangles, sort of SIP
> > packages, DEC tried in the late 1960s? They were a disaster with
> > reliability, but they did ship.
> >
> > --
> > Will
> >
>

Re: Which DEC machine made use of th pre Flip-Chip board?

[Al Kossow via cctalk]

yea, that was it

http://www.computerhistory.org/collections/catalog/XD37.80

I didn't know we had this example in the collection, they were
hybrids like IBM SLDs

Do you know of any module part numbers that used them?


On 12/21/18 2:40 PM, William Donzelli wrote:
>> The original "Flip Chip" was a packaging failure. It was literally a die 
>> bonded to a PCB
>> and never went into production.
>>
>> I think it is mentioned in "Computer Engineering"
>>
>> IBM perfected the techniques to do this later with the development of solder 
>> bumps and
>> IR reflow.
> 
> Are you talking about the little black rectangles, sort of SIP
> packages, DEC tried in the late 1960s? They were a disaster with
> reliability, but they did ship.
> 
> --
> Will
> 

Re: Which DEC machine made use of th pre Flip-Chip board?

[William Donzelli via cctalk]

> The original "Flip Chip" was a packaging failure. It was literally a die 
> bonded to a PCB
> and never went into production.
>
> I think it is mentioned in "Computer Engineering"
>
> IBM perfected the techniques to do this later with the development of solder 
> bumps and
> IR reflow.

Are you talking about the little black rectangles, sort of SIP
packages, DEC tried in the late 1960s? They were a disaster with
reliability, but they did ship.

--
Will

Re: Which DEC machine made use of th pre Flip-Chip board?

[William Donzelli via cctalk]

> AFAIK, the first ICs (in the modern sense) on FLIP CHIPS were on M-series.

I think the W706 and W707 predated the M series by a hair, using
commercial MRTL (I think). These were the early TTY
receiver/transmitter cards.

--
Will

Re: Which DEC machine made use of th pre Flip-Chip board?

[Bob Rosenbloom via cctalk]

On 12/21/2018 2:49 AM, Mattis Lind via cctalk wrote:

There is an auction for some kind of early DEC module. It appears to be a
bit slice of MB, AR and MQ. There is also a signature by Gordon Bell on the
board.

But I cannot figure out which early machine it comes from.

https://www.ebay.com/itm/Vintage-DEC-6205-Arithmetic-Registers-Circuit-Board-for-Vintage-Mainframe/264093791320?hash=item3d7d377458:g:U2AAAOSwpTBcGULN

The same seller has several other pre Flip-Chip modules like 4706 Teletype
Receiver. If I read correctly the transistors are dated 1963-1964.

https://www.ebay.com/itm/Vintage-DEC-4706C-8-Bit-Teletype-Receiver-Circuit-Board-for-Vintage-Mainframe/323607301613?hash=item4b587f8ded:g:AMcAAOSwXF5cGUH9


They are from a PDP_5. I have a 5 so am bidding on a few of the boards.

Bob

--
Vintage computers and electronics
www.dvq.com
www.tekmuseum.com
www.decmuseum.org

Re: Which DEC machine made use of th pre Flip-Chip board?

[Noel Chiappa via cctalk]

> From: Allison

> IC as in digital logic were in production in the early 60s

Yes, but if you look at the picture/manual (I found a "Module location for
I/O" chart on pg. 335 of the PDP-7 Maint Manual - alas, not the whole
machine, just the FLIP CHIP part), the PDP-7 is all B-series and R-series
FLIP CHIPs, which are all discrete transistors.

AFAIK, the first ICs (in the modern sense) on FLIP CHIPS were on M-series.

Noel

Re: Which DEC machine made use of th pre Flip-Chip board?

[allison via cctalk]

On 12/21/2018 09:33 AM, Noel Chiappa via cctalk wrote:
> > through (I think) the PDP-7; at least, this PDP-7 internals image
> > .. seems to show System Modules at the top, and FLIP CHIPs at the
> > bottom.
>
> After groveling through the 'PDP-7 Maintainence Manual' (F-77A), this seems to
> be accurate. In "Module Identification" (pg. 6-5), it refers to both types; 
> the
> example on the next page uses a 4303, a 4000-Series System Module.
>
> What's interesting is the physical layout; all System Modules at the top of
> that image, and FLIP CHIPs at the bottom. No doubt this is partially for
> mechanical reasons (the two used different backplanes), but I wonder about the
> division into sub-systems; were the two types interspersed among each other in
> individual sub-systems (rewquiring running wires from the top to the bottom),
> or were sub-systems exclusively one or the other (so that the top of the bay
> is one sub-system, and the bottom another)?
>
> No doubt I could answer this by studying the prints, but time is short; 
> perhaps
> someone who worked on the one at the LCM and already knows the answer can
> enlighten us!
>
> Noel
IC as in digital logic  were in production in the early 60s and RTL/DTL
the  oldest I was playing with as a kid by '66
and TTL started to appear well before 1970.  The stuff of the day was
2input Nand, Nor, 4 bit counters, and
similar SSI logic.

We forget the AGC Apollo guidance computer used a dual 3input NOR RTL
dating to 1960.  This was already
old by 1970.  People were building frequency counters with RTL
(uL914/923, MC789 and friends as
"hobbyist chips" it by then.  Least I was able to buy uL9xx, MC7XX,
MC10K,  in the late 60s for under a
dollar a package.

The transition from transistors to ICs was fast.  Cost and space were
drivers and generally speed as well.
The industry needed faster and more reliable and interconnects needed to
be fewer.  At the same time ICs
went from 1960 dual 3input nor to MSI (7483 quad full adder and 74181
ALU) in about 10 years.  The computer
industry were the early consumers.

Allison

Re: Which DEC machine made use of th pre Flip-Chip board?

[Jon Elson via cctalk]

On 12/21/2018 07:19 AM, Noel Chiappa via cctalk wrote:

 > From: Mattis Lind

 > I cannot figure out which early machine it comes from.

They're called 'System Modules':

   http://gunkies.org/wiki/System_Module

and they were used from the PDP-1 through (I think) the PDP-7; at least, this
PDP-7 internals image:

   https://www.soemtron.org/images/jpgs/decimages/sn113robertjohnson85680004.jpg

seems to show System Modules at the top, and FLIP CHIPs at the bottom. (I'm
pretty sure even the first PDP-8 - the 'straight 8' - uses only early FLIP
CHIPs - transistorized ones.)

The DEC brochure for it (P5141) is a little puzzling; it says (p. 2) that
"INTEGRATED CIRCUITS are basic elements of the low cost, newly designed
silicon FLIP CHIP modules used throughout PDP-7", but AFAIK, the first FLIP
CHIPs (R-series, B-series, etc) were all transistors; the later M-series were
the first ones to have ICs. Maybe this is some old meaning of "integrated
circuits"?


Yes, PDP-5 and DEC LINC were made with "System Building 
Blocks", similar in technology to the board pictured, but 
single-width and wrapped in an aluminum frame, with a blue 
connector hand-wired to one end.  Single-sided, 
paper-phenolic PCBs.
Kind of similar to half of the board in the picture.  I 
think this same technology was used in a number of other 
machines.  Discrete transistors, diode-steered 
capacitor-coupled FFs, really ANCIENT technology.


The "classic" PDP-8 was built with basically the same 
circuit technology, but on smaller, unframed glass-epoxy 
PCBs with etched and gold-plated card-edge fingers, with 
color-coded handles indicating what technology was on it.  
So, basic logic was R with red handles, memory boards 
(select, read amp, etc.) were G with green handles, etc.


Jon

Re: Which DEC machine made use of th pre Flip-Chip board?

[Al Kossow via cctalk]

On 12/21/18 5:19 AM, Noel Chiappa via cctalk wrote:

> The DEC brochure for it (P5141) is a little puzzling; it says (p. 2) that
> "INTEGRATED CIRCUITS are basic elements of the low cost, newly designed
> silicon FLIP CHIP modules used throughout PDP-7", but AFAIK, the first FLIP
> CHIPs (R-series, B-series, etc) were all transistors; the later M-series were
> the first ones to have ICs. Maybe this is some old meaning of "integrated
> circuits"?

The original "Flip Chip" was a packaging failure. It was literally a die bonded 
to a PCB
and never went into production.

I think it is mentioned in "Computer Engineering"

IBM perfected the techniques to do this later with the development of solder 
bumps and
IR reflow.

Re: Which DEC machine made use of th pre Flip-Chip board?

[Noel Chiappa via cctalk]

> through (I think) the PDP-7; at least, this PDP-7 internals image
> .. seems to show System Modules at the top, and FLIP CHIPs at the
> bottom.

After groveling through the 'PDP-7 Maintainence Manual' (F-77A), this seems to
be accurate. In "Module Identification" (pg. 6-5), it refers to both types; the
example on the next page uses a 4303, a 4000-Series System Module.

What's interesting is the physical layout; all System Modules at the top of
that image, and FLIP CHIPs at the bottom. No doubt this is partially for
mechanical reasons (the two used different backplanes), but I wonder about the
division into sub-systems; were the two types interspersed among each other in
individual sub-systems (rewquiring running wires from the top to the bottom),
or were sub-systems exclusively one or the other (so that the top of the bay
is one sub-system, and the bottom another)?

No doubt I could answer this by studying the prints, but time is short; perhaps
someone who worked on the one at the LCM and already knows the answer can
enlighten us!

  Noel

Re: Which DEC machine made use of th pre Flip-Chip board?

[Paul Koning via cctalk]

> On Dec 21, 2018, at 8:19 AM, Noel Chiappa via cctalk  
> wrote:
> 
> ...
> The DEC brochure for it (P5141) is a little puzzling; it says (p. 2) that
> "INTEGRATED CIRCUITS are basic elements of the low cost, newly designed
> silicon FLIP CHIP modules used throughout PDP-7", but AFAIK, the first FLIP
> CHIPs (R-series, B-series, etc) were all transistors; the later M-series were
> the first ones to have ICs. Maybe this is some old meaning of "integrated
> circuits"?
> 
>   Noel

It's odd wording for sure, and doesn't feel like a common use of the term from 
before the arrival of monolithic integrated circuits.  But there is some 
precedent; through the 1970s if not somewhat later there were "hybrid 
integrated circuits", often found in high performance A/D and D/A converters.  
Those are essentially compact circuit modules, but typically with unusual 
substrates like ceramic ones instead of PC boards, and surface mount components 
when PCBs used all through-hole components.  So "integrated circuit" wasn't 
limited to the "monolithic" kind back then.

I sometimes refer to "hollow state integrated circuits" to describe the 
complete multi-stage amplifier in a single package built by Loewe of Germany in 
the 1930s; look for "Loewe 3NF".

paul

Re: Which DEC machine made use of th pre Flip-Chip board?

[John Foust via cctalk]

At 04:49 AM 12/21/2018, Mattis Lind via cctalk wrote:
>There is an auction for some kind of early DEC module. It appears to be a
>bit slice of MB, AR and MQ. There is also a signature by Gordon Bell on the
>board.

Back in 2006 I asked Gordon Bell to confirm the provenance
of a similar board that I bought on eBay in 2001.  See below.

- John

From: "Gordon Bell" 
To: "John Foust" 

Yes. 
I signed the PDP-6, 4 register, bit slice board in the photo. 
It came from the Computer Museum in Boston where it was sold in their store
 
Let me be clear The Computer Museum (TCM) was NEVER called the Boston Computer 
Museum... 
Boston was a temporary home when computing passed through New England, but the 
city itself gave nothing to it.
 
I don't believe the origin can be traced to any machine, since there were no 
serial numbers, and the modification level would also be too hard to correlate 
with any time or place.
The Museum got a large number of spares and scraps of all kinds from Digital 
and it was undoubtedly one of those.
To my knowledge, the museum has never engaged in gutting machines for 
components, although I would happily agree that this is a good idea when we 
have duplicates and crippled or partial artifacts.
 
As a former collector, founder, and board member of the Digital Computer Museum 
> The Computer Museum >> current Computer History Museum (a name I deplore and 
that exists only because of the way the Museum left Boston) I have always been 
a strong advocate of getting as many artifacts into as many hands as possible, 
and this includes selling museum artifacts when appropriate.  In essence a 
whole industry of museums and collectors is essential.
 
Incidentally, at one point there was a flame in pre-blog days about the tragedy 
of the museum selling boards, etc. in which I never engaged.
As someone who has contributed about $10 million as well as time, etc. to this 
endeavor, I can only shake my head... and wonder where those folks were when 
the museum needed their financial and time support.
 
The lovely ending is that the museum finally has a wonderful home and caring 
environment with lots of people that support it with love, time, and money.
Hope you have or intend to visit it in Mountain View.
 
I trust I have your own financial support and trust you are a member there, too.
See www.computerhistory.org 
 
g
 
-Original Message-
From: John Foust [mailto:jfo...@threedee.com] 
Sent: Saturday, February 11, 2006 1:31 AM
To: Gordon Bell
Subject: PDP-6 board from BCM?
 
 
Can I confirm the provenance of an item I purchased?
 
It's an S6205D board, signed by "Gordon Bell".  Below is a Usenet
post that may describe the event at the Boston Computer Museum
where it was first sold.
 
Did you sign this board, and do you remember the circumstances?
 
- John 

Article 1624 of alt.sys.pdp10:
Path: 
shellx.best.com!news1.best.com!sgigate.sgi.com!enews.sgi.com!decwrl!pa.dec.com!nntpd.lkg.dec.com!lead.zk3.dec.com!zk2nws.zko.dec.com!denton.zko.dec.com!amartin
From: amar...@denton.zko.dec.com (Alan H. Martin)
Newsgroups: alt.sys.pdp10
Subject: Re: Working for PDP-10 En
Date: 21 Feb 1996 13:12:21 GMT
Organization: DEC
Lines: 27
Message-ID: <4gf5nl$k...@zk2nws.zko.dec.com>
References:  <1996feb14.16493...@eisner.decus.org> 

NNTP-Posting-Host: denton.zko.dec.com
 
In article  alder...@netcom.com writes:
>In article <1996feb14.16493...@eisner.decus.org> steven...@eisner.decus.org
>(Jack H. Stevens) writes:
...
>>How about trying The Computer Museum, in Boston? (also at http://www.tcm.org)
> 
>Bad idea.  The Computer Museum has buried any interesting (read "36-bit")
>hardware.  They were given, for example, the Stanford Artificial Intelligence
>Laboratory PDP-6 in 1984, after it was shown at the Fall DECUS Symposia (for
>the 20th Anniversary of 36-Bit Computing).
> 
>It has never been made available for public view; as far as anyone can tell,
>it has disappeared from the face of the earth.
 
I'm hazy on dates, but if the 6 in question was donated before the museum's
move from MR2 to Boston, you ain't likely to see it in one piece ever again.

They had a garage sale of unwanted items in the MR1 cafeteria one Saturday
before the move, and were selling a PDP-6 module-by-module.  An S6205K
"Arithmetic Registers" module (1-bit slice of AR/MQ/MB/) went
for $7, autographed by Gordon Bell.
 
I asked him whether read-in mode was implemented as a diode array encoding
instructions.  He said no, and kindly recommended the 6205 as a particularly
central module to have, instead.
   /AHM
-- 
Alan Howard Martinamar...@tle.enet.dec.com
  

Re: Which DEC machine made use of th pre Flip-Chip board?

[Noel Chiappa via cctalk]

> From: Mattis Lind

> I cannot figure out which early machine it comes from.

They're called 'System Modules':

  http://gunkies.org/wiki/System_Module

and they were used from the PDP-1 through (I think) the PDP-7; at least, this
PDP-7 internals image:

  https://www.soemtron.org/images/jpgs/decimages/sn113robertjohnson85680004.jpg

seems to show System Modules at the top, and FLIP CHIPs at the bottom. (I'm
pretty sure even the first PDP-8 - the 'straight 8' - uses only early FLIP
CHIPs - transistorized ones.)

The DEC brochure for it (P5141) is a little puzzling; it says (p. 2) that
"INTEGRATED CIRCUITS are basic elements of the low cost, newly designed
silicon FLIP CHIP modules used throughout PDP-7", but AFAIK, the first FLIP
CHIPs (R-series, B-series, etc) were all transistors; the later M-series were
the first ones to have ICs. Maybe this is some old meaning of "integrated
circuits"?

Noel

Re: Which DEC machine made use of th pre Flip-Chip board?

[Mattis Lind via cctalk]

Den fre 21 dec. 2018 kl 12:03 skrev Rod Smallwood via cctalk <
cctalk@classiccmp.org>:

> It could be a prototype that never made it to production, internal
> automated test gear or a bespoke job.
>

Do you know or just guessing? Why would it be some kind of test gear with a
AR, MQ, and MB designation?

I searched a bit more and the PDP-6 has exactly AR, MQ and MB registers. My
guess it comes from a PDP-6 since it was not used in the PDP-1, PDP-4 and
PDP-5 from looking in the maintenance manuals.. Then I found this manual:

http://bitsavers.trailing-edge.com/pdf/dec/pdp6/F-67_circuitInstr_May66.pdf

Which confirms that is from a PDP-6. Page 3-13. It also makes sense since
one of the other boards from the same seller has a tag on it which indicate
PDP-6.

Case closed..


>
> Rod
>
>
> On 21/12/2018 10:49, Mattis Lind via cctalk wrote:
> > There is an auction for some kind of early DEC module. It appears to be a
> > bit slice of MB, AR and MQ. There is also a signature by Gordon Bell on
> the
> > board.
> >
> > But I cannot figure out which early machine it comes from.
> >
> >
> https://www.ebay.com/itm/Vintage-DEC-6205-Arithmetic-Registers-Circuit-Board-for-Vintage-Mainframe/264093791320?hash=item3d7d377458:g:U2AAAOSwpTBcGULN
> >
> > The same seller has several other pre Flip-Chip modules like 4706
> Teletype
> > Receiver. If I read correctly the transistors are dated 1963-1964.
> >
> >
> https://www.ebay.com/itm/Vintage-DEC-4706C-8-Bit-Teletype-Receiver-Circuit-Board-for-Vintage-Mainframe/323607301613?hash=item4b587f8ded:g:AMcAAOSwXF5cGUH9
>
> --
>
>
>

Re: Which DEC machine made use of th pre Flip-Chip board?

[Rod Smallwood via cctalk]

It could be a prototype that never made it to production, internal 
automated test gear or a bespoke job.


Rod


On 21/12/2018 10:49, Mattis Lind via cctalk wrote:

There is an auction for some kind of early DEC module. It appears to be a
bit slice of MB, AR and MQ. There is also a signature by Gordon Bell on the
board.

But I cannot figure out which early machine it comes from.

https://www.ebay.com/itm/Vintage-DEC-6205-Arithmetic-Registers-Circuit-Board-for-Vintage-Mainframe/264093791320?hash=item3d7d377458:g:U2AAAOSwpTBcGULN

The same seller has several other pre Flip-Chip modules like 4706 Teletype
Receiver. If I read correctly the transistors are dated 1963-1964.

https://www.ebay.com/itm/Vintage-DEC-4706C-8-Bit-Teletype-Receiver-Circuit-Board-for-Vintage-Mainframe/323607301613?hash=item4b587f8ded:g:AMcAAOSwXF5cGUH9


--

Which DEC machine made use of th pre Flip-Chip board?

[Mattis Lind via cctalk]

There is an auction for some kind of early DEC module. It appears to be a
bit slice of MB, AR and MQ. There is also a signature by Gordon Bell on the
board.

But I cannot figure out which early machine it comes from.

https://www.ebay.com/itm/Vintage-DEC-6205-Arithmetic-Registers-Circuit-Board-for-Vintage-Mainframe/264093791320?hash=item3d7d377458:g:U2AAAOSwpTBcGULN

The same seller has several other pre Flip-Chip modules like 4706 Teletype
Receiver. If I read correctly the transistors are dated 1963-1964.

https://www.ebay.com/itm/Vintage-DEC-4706C-8-Bit-Teletype-Receiver-Circuit-Board-for-Vintage-Mainframe/323607301613?hash=item4b587f8ded:g:AMcAAOSwXF5cGUH9