4 Feb
2019
4 Feb
'19
10:51 a.m.
Date: Sun, 3 Feb 2019 22:22:42 +0100
From: Pontus Pihlgren <pontus at Update.UU.SE>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Subject: Looking for Limited Function Board
Message-ID: <20190203212242.GF24947 at Update.UU.SE>
Content-Type: text/plain; charset=us-ascii
Hi
I'm restoring a PDP-8/a with the help of some
friends. The CPU is now passing the MAINDECs I've
thrown at it. The memory is a modern semiconductor
board my friend Anders Sandahl made.
This machine is pieced together from several others
and the limited function panel I got does not match
the backplane I have.
My theory is the DEC simplified the design of the
boardto cut costs and simpler design is not
compatible. Mine is labeled (on the PCB):
"LIMITED FUNCTION BD.
5411507
5011506C-P2"
And the one I need is:
"LIMITED FUNCTION
5411165
5011167"
However, the picture I have of the other is not so
good. I may have read the numbera wrong.
I would very much like to buy one to finish this
project.
/P
F?r du inget napp s? ritar jag upp ett kort till dig, det borde g? att
flytta ?ver brytarna fr?n det du har. Lite synd att scrappa ett
originalkort bara, men ?r man f?rsiktigt s? man inte tar s?nder det s? g?r
det ju att ?terst?lla...
/A
4 Feb
4 Feb
7:41 p.m.
I have a few of the limited function and programmers panels. I do not
recall either of them being dependent on particular backplane. I'll try to
pull a few a few later and check the part number on them.
Remember, a 54-XXXXX number can become a 70-XXXXX with the addition of a
cable or something simple.
Paul
On Mon, Feb 4, 2019 at 12:51 PM Anders Sandahl via cctech <
cctech at classiccmp.org> wrote:
Date: Sun, 3
Feb 2019 22:22:42 +0100
From: Pontus Pihlgren <pontus at Update.UU.SE>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Subject: Looking for Limited Function Board
Message-ID: <20190203212242.GF24947 at Update.UU.SE>
Content-Type: text/plain; charset=us-ascii
Hi
I'm restoring a PDP-8/a with the help of some
friends. The CPU is now passing the MAINDECs I've
thrown at it. The memory is a modern semiconductor
board my friend Anders Sandahl made.
This machine is pieced together from several others
and the limited function panel I got does not match
the backplane I have.
My theory is the DEC simplified the design of the
boardto cut costs and simpler design is not
compatible. Mine is labeled (on the PCB):
"LIMITED FUNCTION BD.
5411507
5011506C-P2"
And the one I need is:
"LIMITED FUNCTION
5411165
5011167"
However, the picture I have of the other is not so
good. I may have read the numbera wrong.
I would very much like to buy one to finish this
project.
/P
F?r du inget napp s? ritar jag upp ett kort till dig, det borde g? att
flytta ?ver brytarna fr?n det du har. Lite synd att scrappa ett
originalkort bara, men ?r man f?rsiktigt s? man inte tar s?nder det s? g?r
det ju att ?terst?lla...
/A
5 Feb
5 Feb
5:54 p.m.
Hi Pontus,
I looked at my limited function front panels, and they were 54-11507s. I
have not looked at any prints. Where did you find the 54-11165 number?
Could it be for a Q-bus system?
The 50-XXXXX is the etched PCB. DEC usually added a 1 to that number to
make it complete board.
Thanks, Paul
On Mon, Feb 4, 2019 at 9:41 PM Paul Anderson <useddec at gmail.com> wrote:
I have a few of the limited function and programmers
panels. I do not
recall either of them being dependent on particular backplane. I'll try to
pull a few a few later and check the part number on them.
Remember, a 54-XXXXX number can become a 70-XXXXX with the addition of a
cable or something simple.
Paul
On Mon, Feb 4, 2019 at 12:51 PM Anders Sandahl via cctech <
cctech at classiccmp.org> wrote:
> > Date: Sun, 3 Feb 2019 22:22:42 +0100
> > From: Pontus Pihlgren <pontus at Update.UU.SE>
> > To: "General Discussion: On-Topic and Off-Topic Posts"
> > <cctalk at classiccmp.org>
> > Subject: Looking for Limited Function Board
> > Message-ID: <20190203212242.GF24947 at Update.UU.SE>
> > Content-Type: text/plain; charset=us-ascii
> >
> > Hi
> >
> > I'm restoring a PDP-8/a with the help of some
> > friends. The CPU is now passing the MAINDECs I've
> > thrown at it. The memory is a modern semiconductor
> > board my friend Anders Sandahl made.
> >
> > This machine is pieced together from several others
> > and the limited function panel I got does not match
> > the backplane I have.
> >
> > My theory is the DEC simplified the design of the
> > boardto cut costs and simpler design is not
> > compatible. Mine is labeled (on the PCB):
> >
> > "LIMITED FUNCTION BD.
> > 5411507
> > 5011506C-P2"
> >
> > And the one I need is:
> >
> > "LIMITED FUNCTION
> > 5411165
> > 5011167"
> >
> > However, the picture I have of the other is not so
> > good. I may have read the numbera wrong.
> >
> > I would very much like to buy one to finish this
> > project.
> >
> > /P
>
> F?r du inget napp s? ritar jag upp ett kort till dig, det borde g? att
> flytta ?ver brytarna fr?n det du har. Lite synd att scrappa ett
> originalkort bara, men ?r man f?rsiktigt s? man inte tar s?nder det s? g?r
> det ju att ?terst?lla...
>
> /A
>
>
6 Feb
6 Feb
12:42 a.m.
Hi Paul
I have put pictures of the boards here:
http://pdp8.se/slask/LFB
have.jpg is the board I have and want.jpg is the one
I'm looking for.
The identifying numbers are in aproximately the same
place. But you can clearly see that the "want" board
is much simplified and if I interpret the
documentation correctly they are not compatible.
I'm happy to be proven wrong, maybe I should just try
it.
/P
On Tue, Feb 05, 2019 at 07:54:39PM -0600, Paul Anderson via cctalk wrote:
Hi Pontus,
I looked at my limited function front panels, and they were 54-11507s. I
have not looked at any prints. Where did you find the 54-11165 number?
Could it be for a Q-bus system?
The 50-XXXXX is the etched PCB. DEC usually added a 1 to that number to
make it complete board.
Thanks, Paul
On Mon, Feb 4, 2019 at 9:41 PM Paul Anderson <useddec at gmail.com> wrote:
> I have a few of the limited function and programmers panels. I do not
> recall either of them being dependent on particular backplane. I'll try to
> pull a few a few later and check the part number on them.
>
> Remember, a 54-XXXXX number can become a 70-XXXXX with the addition of a
> cable or something simple.
>
> Paul
>
> On Mon, Feb 4, 2019 at 12:51 PM Anders Sandahl via cctech <
> cctech at classiccmp.org> wrote:
>
>> > Date: Sun, 3 Feb 2019 22:22:42 +0100
>> > From: Pontus Pihlgren <pontus at Update.UU.SE>
>> > To: "General Discussion: On-Topic and Off-Topic Posts"
>> > <cctalk at classiccmp.org>
>> > Subject: Looking for Limited Function Board
>> > Message-ID: <20190203212242.GF24947 at Update.UU.SE>
>> > Content-Type: text/plain; charset=us-ascii
>> >
>> > Hi
>> >
>> > I'm restoring a PDP-8/a with the help of some
>> > friends. The CPU is now passing the MAINDECs I've
>> > thrown at it. The memory is a modern semiconductor
>> > board my friend Anders Sandahl made.
>> >
>> > This machine is pieced together from several others
>> > and the limited function panel I got does not match
>> > the backplane I have.
>> >
>> > My theory is the DEC simplified the design of the
>> > boardto cut costs and simpler design is not
>> > compatible. Mine is labeled (on the PCB):
>> >
>> > "LIMITED FUNCTION BD.
>> > 5411507
>> > 5011506C-P2"
>> >
>> > And the one I need is:
>> >
>> > "LIMITED FUNCTION
>> > 5411165
>> > 5011167"
>> >
>> > However, the picture I have of the other is not so
>> > good. I may have read the numbera wrong.
>> >
>> > I would very much like to buy one to finish this
>> > project.
>> >
>> > /P
>>
>> F?r du inget napp s? ritar jag upp ett kort till dig, det borde g? att
>> flytta ?ver brytarna fr?n det du har. Lite synd att scrappa ett
>> originalkort bara, men ?r man f?rsiktigt s? man inte tar s?nder det s? g?r
>> det ju att ?terst?lla...
>>
>> /A
>>
>>
1:41 a.m.
Hi,
I have looked into my PDP-8/a computers now. The small one have the
limited function board that you want. That is the machine that should be
identical to yours.
In my big PDP-8a/420 I have the same board as you have "have.jpg" but in
another revision (no IDC header connector, just the DIL connector).
The big machine is a core memory machine. I had a quick look at the
schematics, they are not compatible.
/Anders
Hi Paul
I have put pictures of the boards here:
http://pdp8.se/slask/LFB
have.jpg is the board I have and want.jpg is the one
I'm looking for.
The identifying numbers are in aproximately the same
place. But you can clearly see that the "want" board
is much simplified and if I interpret the
documentation correctly they are not compatible.
I'm happy to be proven wrong, maybe I should just try
it.
/P
On Tue, Feb 05, 2019 at 07:54:39PM -0600, Paul Anderson via cctalk wrote:
Hi Pontus,
I looked at my limited function front panels, and they were 54-11507s. I
have not looked at any prints. Where did you find the 54-11165 number?
Could it be for a Q-bus system?
The 50-XXXXX is the etched PCB. DEC usually added a 1 to that number to
make it complete board.
Thanks, Paul
On Mon, Feb 4, 2019 at 9:41 PM Paul Anderson <useddec at gmail.com> wrote:
I have a few of the limited function and
programmers panels. I do not
recall either of them being dependent on particular backplane. I'll
try to
pull a few a few later and check the part number
on them.
Remember, a 54-XXXXX number can become a 70-XXXXX with the addition of
a
cable or something simple.
Paul
On Mon, Feb 4, 2019 at 12:51 PM Anders Sandahl via cctech <
cctech at classiccmp.org> wrote:
> > Date: Sun, 3 Feb 2019 22:22:42 +0100
> > From: Pontus Pihlgren <pontus at Update.UU.SE>
> > To: "General Discussion: On-Topic and Off-Topic Posts"
> > <cctalk at classiccmp.org>
> > Subject: Looking for Limited Function Board
> > Message-ID: <20190203212242.GF24947 at Update.UU.SE>
> > Content-Type: text/plain; charset=us-ascii
> >
> > Hi
> >
> > I'm restoring a PDP-8/a with the help of some
> > friends. The CPU is now passing the MAINDECs I've
> > thrown at it. The memory is a modern semiconductor
> > board my friend Anders Sandahl made.
> >
> > This machine is pieced together from several others
> > and the limited function panel I got does not match
> > the backplane I have.
> >
> > My theory is the DEC simplified the design of the
> > boardto cut costs and simpler design is not
> > compatible. Mine is labeled (on the PCB):
> >
> > "LIMITED FUNCTION BD.
> > 5411507
> > 5011506C-P2"
> >
> > And the one I need is:
> >
> > "LIMITED FUNCTION
> > 5411165
> > 5011167"
> >
> > However, the picture I have of the other is not so
> > good. I may have read the numbera wrong.
> >
> > I would very much like to buy one to finish this
> > project.
> >
> > /P
>
> F?r du inget napp s? ritar jag upp ett kort till dig, det borde g?
att
> flytta ?ver brytarna fr?n det du har. Lite
synd att scrappa ett
> originalkort bara, men ?r man f?rsiktigt s? man inte tar s?nder det
s? g?r
>> det ju att ?terst?lla...
>>
>> /A
>>
>>
2145
days inactive
2147
days old
4 comments
3 participants
participants (3)
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anders＠abc80.net -
pontus＠Update.UU.SE -
useddec＠gmail.com