4K (84x48) pixel beamer
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First let me explain the title of the project. It is named 4K pixel because 84x48=4032 pixels (rounded to 4000 or 4K). This project was build in an time when it was impossible to think of a video projector which was capable of outputting more then 4000 pixels on one line. This is what a modern beamer in the year 2012 is capable of (although a bit costly but available to the public). When I made this project the resolution of camera's was given in X * Y, 1Mpixel, 2, 4 even 12Mpixels was becoming a common term. It is logical to name the resolution in product of X and Y, we've done it so for years, even all sorts of cameras are indicated using that method. So I named by beamer according the same logical naming rules.

But now in 2012, beamers are available that are called 4K beamers, because they output 4000 pixels on the horizontal resolution and 2000-something (or more) on the vertcial, anyway the do not use the product of X and Y in the name, they only use X, why!??! I don't know. I could ramble for lot's of sentences about the idiot who has made this up, why did he/she create this "name". Was it to spread confusion ? Was it simply ignorance? Was it somebody who was to lazy to calculate X*Y (or perhaps not smart enough to use a calculator)? We will, most likely, never really know. So let's blame it on marketing, because that is (in most cases) the a department who doesn't care (or isn't aware) of technical or logical standards. They only care if it sounds good or if it sells. In the more then 60 years that television has been a standard, or even longer back, since the year 1926 the number of lines (that is Y and not X) are given to indicate the resolution. (In 1926 they used a disc with holes and the numer of holes determined the numer of lines, so 16 holes made a picture with a resolution of 16 lines). So why on earth do people these days named these high end beamers 4K beamers is something I'm not comfortable with. Damn... now I did ramble about it.

Anyway, that new standard is confusing regarding this project. But don't get me wrong, I welcome this technical achievement with both arms. So I hope it is clear now that this page is about a low end beamer, as low as you can go (well you can go down to 1 pixel, but that wouldm't display much would it). My project is merely suited for text display and fun.

The project:

The 1541-III project has evolved and a new and better display has come up. Where the prototype had only a 2 line display, now the final version has a display capable of 6 lines. It is not text based but graphical. This LCD is from an old nokia telephone and can be bought new on marktplaats or ebay for a few euro’s. With some small modifications this display can be used as an frame inside a slide-projector. Since I did not have a slide-projector I decided to build one myself.

I could use it for my next presentation at the commodore meeting in Maarsen.  What it does is simple and I’m very pleased with the result. The beamer projects the image of the 1541-III’s display onto a wall/screen so it can be seen by more then one person. Also it draws attention to my project in a simple way...
The beamer open. As you can see from left to right: the transformer (230V->12V), the 50W halogeen lamp, the rectifier and fan. The fan is driven with 9V instead of 12 to reduce the noise, the airflow is still sufficient. Then two sheets of thin glass to isolate the heated air, then a creditcardsized fresnellens (sold as an portable unbreakable magnifying lens years), the LCD (84x48 = 4032 pixels) obtained from an old nokia phone (the reflective foil had to be removed and wires soldered directly to the LCD’s controller). Then last but not least a lense from an unused magnifying glass. The total cost was under 20 Euro’s. If you try to replicate this, build a cardboard versions first, this works quickly and saves a lot of mathematical effort. I can assure you, working with low cost materials like these the trial and error method is much faster then the theoretical.
The splash screen of the 1541-III project now the size of a normal bedroom-door. Now you can clearly see why this project is called 4K-pixel beamer.

The main screen of the 1541-III, here you can see the : File indexnumber/totalnumber of files on card, name of currently selected .D64 file, after reset no file is selected therefore all actions refer to the root directory, 2 empty lines that do not really have a final definition (currently it states the processed command), a progress bar (show loading status), device-id (8 or 9), current track, current sector.