This is an improved version of my previous CPU. Here are the improvements:

• Added 13 more registers
• Improved the instructions decoder
• Added a second input
• Revised some of the commands

+++ Register Documentation +++

Main Registers:

• 0000: Register O
• 0001: Register 1
• 0010: Register 2

Open Registers:

• 0011: Register A
• 0100: Register B
• 0101: Register C
• 0110: Register D
• 0111: Register E
• 1000: Register F
• 1001: Register G
• 1010: Register H
• 1011: Register I
• 1100: Register J

Reserved Registers:

• 1101: Register X
• 1110: Register Y
• 1111: Register Z

• 00000 - No Operation
• 00001 - Addition [Sets register O to the sum of registers 1 and 2]
• 00010 - Subtraction [Sets register O to the difference of registers 1 and 2]
• 00011 - Increment [Sets register O to register 1 plus one]
• 00100 - Decrement [Sets register O to register 1 minus one]
• 00101 - Not [Sets register O to not register 1]
• 00110 - And [Sets register O to register 1 and register 2]
• 00111 - Or [Sets register O to register 1 or register 2]
• 01000 - Shift Left [Sets register O to register 1 shifted left]
• 01001 - Shift Right Logically [Sets register O to register 1 shifted right logically]
• 01010 - Shift Right Arithmetically [Sets register O to register 1 shifted right arithmetically]
• 01011 - Greater Than [Sets register O to the truth value of register 1 is greater than register 2.   0 = False, 1 = True]
• 01100 - Less Than [Sets register O to the truth value of register 1 is less than register 2.   0 = False, 1 = True]
• 01101 - Is Zero [If register 1 is zero, register O is set to true. Otherwise, register O is set to false.   0 = False, 1 = True]
• 01110 - Set [Sets the register with address of input 2 to the value of input 1]
• 01111 - Copy [Copies the value in the register with address of input 2 to the register with address of input 1]
• 10000 - Clear [Sets the register with an address of input 1 to zero]

• Reserved Registers are there to be used for future features that don't exist yet such as a stack pointer
• Open Registers are just extra memory that can be accessed quickly
• Register O can not have a value set or copied to it