2014-02-17 New Opcodes for TK16

A, B, R registers 16-bits wide

16 address bit, 16 data bit RAM

22 bit wide program memory (xxxxxxaaaaaaaaaaaaaaaa)
6 high bits are instructions 0-63
16 low bits are an address or constant value

Instructions:
0 - load RAM value into A
1 - load RAM value into B
2 - store value in R to RAM at address
3 - load constant into A
4 - load constant into B
5 - store value in R to P (pointer) register
6 - load from RAM to A using address stored in P
7 - load from RAM to B using address stored in P
8 - store key with P
9 - load disp
10 - key to disp
11 - store R to address at P
12 - A + B = R
13 - A - B = R
14 - A x B = R
15 - A/B = R
16 - -A = R
17 - A AND B = R
18 - A OR B = R
19 - NOT A = R
20 - Shift A left by B bits. Result in R
21 - Shift A right by B bits. Result in R
22 - Copy A to R
23 - Copy B to R
24 - Jump To Address 
25 - Jump to Address if R = 0
26 - Jump to Address is R != 0
27 - clear display
28 - counter reset
29 - inc. p
30 - call
31 - return