16 Bit CPU Version 2

This will be an Update of my 16 Bit Redstone CPU.
Specs of Old CPU:

16 Bit ALU:
-Addition
-Subtraction
-Increment
-Decrement
-Compare
-Not
-XOR
-XNOR
-AND
-NAND
-OR
-NOR
-Shift right
-Shift left

4 ALU Register: 2 for A number, 2 for B number
64 Bytes of RAM (32 Adresses a 2 Bytes)
RAM also useable as LIFO Stack
512 Bytes of ROM for 4 Programs, 32 lines each
Jumpable Programcounter

ALU-Flags:
Carry, Negate, Sign and Zero

Status-Flags:
WAIT, RES, HLT

You can connect up to 32 I/O-Devices for this CPU

New stuff for Version 2:
-Added Call and Return Command for Subroutines
-Added 15x15 Pixel GPU (Not finished yet)
GPU Features:
-Draw Pixel
-Draw Horizontal or Vertical line
-Draw Square/rectangle
-Invert Screen
A Video where I demonstrate the Subroutines: