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About 1944GPW

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About 1944GPW
Brisbane, Australia


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April 26th, 2011
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DEC PDP-11/03 switch paddle, LED receptacle and console board

by 1944GPW on March 16th, 2018 at 11:21 PM
I have an MDB Systems workalike LSI-11 backplane which I am starting to get working. I thought it would be nice to build the DBCOK logic and console switches to have the same look and feel as the original PDP-11/03 console so I scripted up the specific DEC switch paddle and LED receptacle as part of the project (which is ongoing) so they can be 3D printed and use a tiny Arduino to do the powerup sequence.

If you have a PDP-11/03 or a PDP-11/05 with missing or broken switch paddles then

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IBM System/360 and System/370 console button replica inserts

by 1944GPW on December 9th, 2017 at 11:19 PM
In case you need some stopgap inserts in a /360 or /370 console, until you find the originals (which I have found is very difficult).
They pass the 'Six foot Rule' test ie. they look good from 6 feet away.

Attachment 42404 Attachment 42405


PTAP2DXF - make paper tapes without a punch

by 1944GPW on December 1st, 2017 at 06:04 AM
If you have a paper tape reader and no punch, you can now make real working paper tapes using a normal home stencil-cutting machine.
I've written a small command line utility that can take a .PTAP (or any other binary or textfile) and generate output that these
machines will cut. that your reader will read.
Attachment 42216Attachment 42217
It can easily make repair pieces for existing old broken tapes from any byte offset. In addition it can

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by 1944GPW on October 6th, 2017 at 10:46 PM
Racking an old PDP-11 or its peripherals can take some care, owing to the weight and bulk. The task can be made easier with this simple equipment lifting cart you can build. You can quickly, easily and accurately rack, unrack and move heavy gear with confidence - and possibly save your back as well.

Attachment 41136 Attachment 41134 Attachment 41137 Attachment 41135

You'll find more information and complete construction

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by 1944GPW on September 29th, 2016 at 07:05 AM
A few months ago I experimented with some do-it-yourself decal material I'd bought at a scale model exhibition.
I'd bought two types of the special paper, one type was the traditional waterslide decal paper in which the image is printed normally as you would look at it, then cut out, dipped in tepid water for 30 seconds and carefully
slid off onto the receiving surface. This type is the same as you have in a model kit. The other type of decal paper is for printing a reverse image,

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