PIC programmers are easy to build yourself. Do a web search for JDM programmer, and you'll find a lot of information. The complete IDE including editors, assemblers, and even simulators is available for free download from the manufacturer, Microchip. They also have a great library of application notes and sample code to help to get you started.
If you already know how to program the 8515, I'd recommend the compatible and far smaller (but still DIP) ATmega8. The STK-500 is the best way to program them, and it's less than $100 from Digi-Key. I write my code in an editor, compile it with avra and load it onto the chip with uisp. There is probably equivalent software for Windows or MacOS, if you use those. You should also see http://www.avrfreaks.net/
Nice thing about the AVR is it's built-in SPI port. You don't need to worry about the protocol, it's handled in hardware. Makes banging data into the DIR1706 or the CS8420 a snap.
Nice thing about the AVR is it's built-in SPI port. You don't need to worry about the protocol, it's handled in hardware. Makes banging data into the DIR1706 or the CS8420 a snap.
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