PDP 11/70 front panel
Digby Tarvin
panel unit (KY11) to a simulator, but am having trouble finding
and information on the interface to the hardware.
Does anyone have any idea what the interface is, or have suggestions
as to where I might look to find the relevent schematics.
Please send any suggestions to dig...@acm.org.
Thanks,
DigbyT
Stuart Johnson
news:Hchfa.1$kx4...@news.dircon.co.uk...
I saw your post on alt.sys.pdp11 and thought you might not have seen this
site: http://www.sparetimegizmos.com/Hardware/KY11_Interface.htm , where the
front panel for an 11/40 is interfaced to John Wilson's E-11 PDP-11
simulator.
I hope this is of some use to you.
Stuart Johnson
Digby Tarvin
Thanks for your suggestion. I did come accross this site, which is the
closest I have come to finding the necessary information. Unfortunately
the author no longer has his 11/40 schematics, and as the 11/70 front
panel is not the same (more lights and switches), there are bound to
be some differences and I am reluctant to risk applying power to the
wrong pins.
If I could find some 11/40 schematics, that might give me enough of
an insight to follow what is going on in the 11/70 panel, but of
course the ideal thing would be to find some 11/70 front panel
schematics or pinouts.
Thanks again for your suggestion.
Regards,
DigbyT
Peter Müri
I own a PDP 11/70 Frontpanel myself, hanging at the wall. I do not have
schematics, but I strongly advise to just look at it by opening it and
do some reverse engineering. To my understanding there are *just* some
LEDs, some switches and some 74xx TTL Chips on there -- so it shoule be
possible to find the PSU in in order not to burn the electronics.
Good luck anyway.
Peter
Switzerland
>Digby Tarvin schrieb:
Ethan Dicks
> Hi Digby,
>
> I own a PDP 11/70 Frontpanel myself, hanging at the wall...
Ow! I wish I had one "hanging on the wall"... I'd pull it down
and mount it in one of my 11/70s. They have the boring RDM console.
-ethan
Al Kossow
> I am trying to work out how to interface an old PDP 11/70 front
> panel unit (KY11) to a simulator, but am having trouble finding
> and information on the interface to the hardware.
>
> Does anyone have any idea what the interface is, or have suggestions
> as to where I might look to find the relevent schematics.
I've placed a scan of the schematic at
www.spies.com/aek/pdf/pdp11/1170_ctlPanelSchem.pdf
Hans B Pufal
> I've placed a scan of the schematic at
> www.spies.com/aek/pdf/pdp11/1170_ctlPanelSchem.pdf
http://www.spies.com/~aek/pdf/dec/pdp11/1170_ctlPanelSchem.pdf
works just a tad better ;-)
-- hbp
Ethan Dicks
Big thanks for this one! From a quick perusal, I can see how it would
be somewhat trivial (tedious, yes, but trivial) to fabricate a functional
replica, especially if I left out the lamp test (lots of diodes that don't
have to be there) and the panel lock. The only concern I have is for ICs
like E1 (9318) and E6 (3001) in case they have odd electrical characteristics
that could affect CPU operation (bus loading, etc.)
Given that I haven't seen an 11/70 front panel as cheap as $200 lately, and
that I need *two* of them, I can see myself taking a stab at just the switches
and lights (no panel lock or lamp test). IIRC, I have some paddle switches
that might work adequately - enough for one replica. Buying new ones, though,
would quickly push the expense of it up into the "better to buy a real panel"
price range. If I ever saw a "two for $300 deal", I'd probably just jump on
them.
Thanks again,
-ethan
Glen Herrmannsfeldt
"Ethan Dicks" <e...@infinet.com> wrote in message
news:45a8229f.03041...@posting.google.com...
> ha...@aconit.org (Hans B Pufal) wrote in message
news:<ddf3c9b0.03041...@posting.google.com>...
> > a...@spies.com (Al Kossow) wrote in message
news:<b79ofp$ts2$1...@spies.com>...
> >
> > > I've placed a scan of the schematic at
> > > www.spies.com/aek/pdf/pdp11/1170_ctlPanelSchem.pdf
> >
> > http://www.spies.com/~aek/pdf/dec/pdp11/1170_ctlPanelSchem.pdf
> >
> > works just a tad better ;-)
>
> Big thanks for this one! From a quick perusal, I can see how it would
> be somewhat trivial (tedious, yes, but trivial) to fabricate a functional
> replica, especially if I left out the lamp test (lots of diodes that don't
> have to be there) and the panel lock. The only concern I have is for ICs
> like E1 (9318) and E6 (3001) in case they have odd electrical
characteristics
> that could affect CPU operation (bus loading, etc.)
I used to know 93xx devices that were pretty much standard TTL, so that is
what I would expect. I don't know about 3001.
> Given that I haven't seen an 11/70 front panel as cheap as $200 lately,
and
> that I need *two* of them, I can see myself taking a stab at just the
switches
> and lights (no panel lock or lamp test). IIRC, I have some paddle
switches
> that might work adequately - enough for one replica. Buying new ones,
though,
> would quickly push the expense of it up into the "better to buy a real
panel"
> price range. If I ever saw a "two for $300 deal", I'd probably just jump
on
> them.
There are people working on IMSAI clones, I believe including paddle
switches. They might have them in large enough quantities to make them
affordable.
Then again, you might get them interested in 11/70 clones.
-- glen
Charles Richmond
>
> [snip...] [snip...] [snip...]
>
> There are people working on IMSAI clones, I believe including paddle
> switches. They might have them in large enough quantities to make them
> affordable.
>
> Then again, you might get them interested in 11/70 clones.
>
to work for IMSAI. I doubt that they would be interested in
PDP-11/70 clones. But they might be willing to sell you some
parts or at least give you the names of their parts suppliers...
--
+----------------------------------------------------------------+
| Charles and Francis Richmond richmond at plano dot net |
+----------------------------------------------------------------+
John Holden
>>Big thanks for this one! From a quick perusal, I can see how it would
>>be somewhat trivial (tedious, yes, but trivial) to fabricate a functional
>>replica, especially if I left out the lamp test (lots of diodes that don't
>>have to be there) and the panel lock. The only concern I have is for ICs
>>like E1 (9318) and E6 (3001) in case they have odd electrical
DEC had tens of thousands of older generation chips that they had the
habit of using in non-critical positions. The 9318 is an 8 line to
3 priority encoder, a 74148 being equivalent. The 3001 is a bog standard
quad AND (and does not drive any bus signals), a 7408 is equivalent
Ethan Dicks
> DEC had tens of thousands of older generation chips that they had the
> habit of using in non-critical positions. The 9318 is an 8 line to
> 3 priority encoder, a 74148 being equivalent.
I knew the 9318 was likely to be a non-issue...
> The 3001 is a bog standard quad AND (and does not drive any bus signals),
> a 7408 is equivalent
OK. Wasn't so sure about the 3001. What logic family/vendor is it that
it doesn't have a 74xx number?
-ethan
Al Kossow
>
> OK. Wasn't so sure about the 3001. What logic family/vendor is it that
> it doesn't have a 74xx number?
>
Intel 3000 series (?)
John Holden
No, its an MC3001. Motorola TTL Series III
John Holden
I should have added that the 74H08 is a direct replacement, although I
don't see that the fanout or speed would be required for that position
in the logic.
Howard M. Harte
interchangeable between the IMSAI 8080 and the Series Two. The Series Two
utilizes the same exact switches and handles as the original 8080. They are
still in production, although they are not cheap, and I believe that there
is a minimum quantity of say 500 or so switches from the manufacturer. I
believe that you can order small "replacement" quantities at www.imsai.net.
When you look at how much a front panel costs to build, it's cheaper to
spend the $200 on an original one... For the IMSAI Series Two, the front
panel accounts for about 1/3 of the entire system cost.
"Charles Richmond" <rich...@ev1.net> wrote in message
news:3E9B4585...@ev1.net...
> Glen Herrmannsfeldt wrote:
> >
> > [snip...] [snip...] [snip...]
> >
[snip...] [snip...] [snip...]
> The people manufacturing the IMSAI clones are people that used
> to work for IMSAI. I doubt that they would be interested in
> PDP-11/70 clones.
It's not entirely out of the question...