In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bean wrote:

[quote="Forrest"]
How many pins are you using for the video and how many for audio? 4-bit audio should be ok[/quote]The SRAM requires 26 pins, the video output uses 6 pins, the audio output is 1 pin (but it's a timer output so you can use high speed PWM to make much more than 16 different volume levels). 


 

I figured out how to do it with 2 resistors by using the different threshold levels to detect which of the two mutually exclusive switches are closed.

 

I've almost got the layout done. I will make a prototype on my LPKF, then get some boards made. 

I only expect to make about 20 kits. If response if good, I may make a SMT populated board.

 

Bean.

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