MINIL Machine-Code Monitor, Improved

This is very nearly all based on David Johnson-Davies' excellent original with some adaptations:

• Meant to run on Arduino Nano instead of ATtiny85
• Ported to Arduino Keypad library use
• Ported to non-TinySPI 7-segment display (normal SPI)
• Added inline instruction set documentation
• Modified Enter button handling for board layout
• Added instruction delay to behave more like ATtiny85
• Added [0-7]9 register display instruction
• Added [0-7]F delay instruction

Parts

• Arduino Nano
• 4x4 keypad
• 7-segment display
• Button
• LED
• 330Ω resistor

Layout

Pin(s)	Function
D9-D2	Keypad
D10	LED
D11	SPI MOSI
D13	SPI SCK
A0	Button GND
A2	Button trigger
A3	SPI CS