Editing Front Panel for 8 Bit Computers V2

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*** Can be configured to interrupt on button presses
 
*** Can be configured to interrupt on button presses
 
*** [https://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf MCP23017] need to be set to Open-Drain output - card has pull-up to Vcc
 
*** [https://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf MCP23017] need to be set to Open-Drain output - card has pull-up to Vcc
* 4 of [https://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf MCP23017] 16-bit I2C Port Expanders
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* 4 MCP23017 16-bit I2C Port Expanders
 
** These are fine pitch surface mount parts
 
** These are fine pitch surface mount parts
 
* 3.3V or 5V operation
 
* 3.3V or 5V operation

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