8 channel Tiny2313 DMX switch

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This projects started as 2 channel DMX switch based on fog machine I found on the web. I wanted more channels, so I added a simple SPI implementation that reads the channel swiches connected to HC165 shift registers. That freed up a stack of pins.
I also wanted to use rotary BCD switches, so I would not be asked by other uses how to set up the channel selections. 4 additional switches are added to future expansion.

VER 3 added 18/04/2006 uses arrays for data channels.

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