Computing
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STOP PRESS  This is my old site last updated June 2005.  Enjoy the pics here but it is best to shift direct to the new site. Looks the same but lots more stuff and regularly updated.  The full size pictures  are only available there.

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Link topics on this page include:

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Computer interfaces VIC 20

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Computer printer / plotter

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PIC microcontrollers

Computer interfaces 1983

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These were digital to analogue and I/O cards I designed for the VIC-20 computer of about a thousand years ago (even before the Commodore 64). It had 3.5 k of memory (not a misprint) but was an easily understood computer and it was possible to program in 8 bit binary machine language as well as Basic. 

Computer printer / plotter  1984

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The VIC-20 had a 5V supply bus which happens to be the same as that used for radio control servos for models. Servos are set to a degree of rotation by a 1.0 to 2.0 mS pulse which could be programmed by the computer using a machine code subroutine for speed. By combining 3 of these servos it was possible to make a printer / plotter and still have a massive 1.5 k of memory left over to program it to do patterns. It was published in an Electronics Today International magazine in 1984. I was a bit niftier with the maths in those days.

PIC microcontrollers  Have been used in a model car as a test bed.

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This is my PICAXE 08 breadboard to get the idea of simple interfacing.

I have also set up a 28A PICAXE controller in a magnetic levitation setup which is under development.  Currently to the stage of unstable levitation but limited by the speed of the 4 Mhz processor.  Hopefully shifting to a 28X chip which has the pulsout command that runs in the background  will fix this.

This page was last updated August 28, 2005