Most of this page is about 2D circuit boards.
For the 3D stuff go here.
Beware -- almost none of this
stuff has been built or debugged! It's just here in case it is of some use
I use Eagle CAD software with the "Pro" license to develop this stuff,
but you should be able to use and view it with either the freeware license
or the non-profit license. As of 2/20/2016, the version of Eagle being used
is Eagle 6.6. (If you retrieved drawings before then, I recommend you get the
This is a collection of most of my various schematics and boards.
There's no documentation for them, so you pretty much have to know what
you're looking at, and it may not be obvious which of the zillion boards
and schematics is what you want. The list is automatically generated,
so if there's stuff in it that I shouldn't be republishing, let me know.
One thing that is there, is that the "DEC" sub-directory has quite a
collection of CAD drawings intended to mimic various original DEC boards.
This is a collection of board outlines and the obsolete components, which
will be useful if you are trying to re-create flip-chip modules or design
new boards for DEC machines. There are outlines and edge connectors for
single, double, quad and even hex-height boards.
You will need to set the "Copper/Dimension" design rule to 15 mils, to
eliminate diagnostics about copper too close to the edge in the edge
connectors. I use 16 mil signal traces and 32 mil power traces, as in
You will also want to set the board routing grid to 25 mils (or other
sub-multiple of 100 and 125 mils). Otherwise it will be difficult to route
from the edge connector to the components, as the edge connector uses a 1/8"
grid, and the components typically use a 1/10" grid. I also set the main grid
to 50 mils, and the multiple to "2", which causes the grid to be drawn at 0.1"
(100 mils). Then I set the alternate grid to 25 mils, so that I can place
things to align with the 125 mil grid when necessary. I can also then use the
alternate grid to move traces around as needed. (The schematic grid should
just be left at the default of 0.1".)
This is a collection of symbolic representations of various DEC flip-chips.
For instance, everything needed to draw the prints and backplane for a TC08
DECTape controller is here. The "m" now stands for "module", so all the various
flip chip families are intended to be included ([ABGHKMRSW]xxx). The package
is one or more H807 connectors, which you can arrange to form your controller
backplane. (I recommend arranging them into standard 2x4 connector blocks, or
you'll have an even harder problem sourcing compatible connectors!)
Note: This library has been updated. The content formerly in dec-r
has been merged in, and the "m" now stands for "modules", including all the
various flip-chip series.
Most of what is needed for the various models of the PDP-8/S is there, as well
as a fair bit of stuff for the peripherals. Note also that the Sxxx and Bxxx
families are essentially faster (and faster yet) versions of the Rxxx module
with the same number, so you can often just over-ride the "value" of the Rxxx
version to Sxxx or Bxxx.
Some of the older schematics and boards still use dec-r, though. I
intend to fix this, as well as some drawings that use dec-m, but fail
to "update" in Eagle.
You will want to set the board grid to .125", to get proper placement of the
parts. Even so, you may have to move them to get them on-grid, as Eagle
tends to place them with incorrect alignment initially.
This is essentially now a copy of dec-m, and it's use is now deprecated.
(It won't be tracking future changes from dec-m, for instance.)