Looking for Limited Function Board

[Pontus Pihlgren]

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
> >>
> >> Får du inget napp så ritar jag upp ett kort till dig, det borde gå att
> >> flytta över brytarna från det du har. Lite synd att scrappa ett
> >> originalkort bara, men är man försiktigt så man inte tar sönder det så går
> >> det ju att återställa...
> >>
> >> /A
> >>
> >>