Instruction set
_________________________________________________________

Every instruction consists of 16 bits. The instruction
itself and an operand (Op). 

------------------------------------------------------------
operation (5-7) | Bus (3-4) | Register (1-2) | Address (0) |
------------------------------------------------------------
Load  (000)	| Mem (00)  | PP     (00)    | Op  (0)	   |
And   (001)	| Op  (01)  | MP     (01)    | X   (1)     |
Or    (010)	| In  (10)  | Acc    (10)    |             |
Xor   (011)	| Acc (11)  | X      (11)    |             |
Add   (100)	|	    |		     |		   |
Sub   (101)	|	    |		     |		   |
                |	    |----------------|             |
Store (110)	|           |                |             |
		|-----------|-----|----------|             |
		| Condition (2-4) |          |             |
		|-----------------|          |             |
Jmp   (111) 	| Alw (000)       |          |             |
		| Grt (001)	  |          |             |
		| Geq (010)	  |          |             |
		| Eq  (011)	  |          |             |
		| Lst (100)	  |          |             |
		| Leq (101)	  |          |             |
		| Cry (110)	  |          |             |
		| Neq (111)	  |          |             |
		|-----------------|          |-------------|

Abbreviatons:
	Sub	Subtract
	Jmp	Jump
	Mem	Memory
	Op	Operand
	In	Input
	Acc	Accumulator
	Alw	Always
	grt	Greater then zero
	geq	Greater or equal to zero
	eq	Equal to zero
	lst	Less then zero
	leq	Less or equal to zero
	cry	Carry
	PP	Program Page
	MP	Memmory Page
	Out	Output