Hex__|__Binary
0 0000
1 0001
2 0010
3 0011
4 0100
5 0101
6 0110
7 0111
8 1000
9 1001
A 1010
B 1011
C 1100
D 1101
E 1110
F 1111
Hex|ASCII
41 A
42 B
43 C
44 D
45 E
46 F
47 G
48 H
49 I
4A J
4B K
4C L
4D M
4E N
4F O
50 P
51 Q
52 R
53 S
54 T
55 U
56 V
57 W
58 X
59 Y
5A Z
So to get R, you'd take 5 and 2 in binary (0110 and 0010, respectively) and put them together: 01100010=R
To get lower case letters, simply add 20 to the upper case value. To get lower case R (72 in hex), simply add 20 to the upper case R's hex value (52). So to type "lol" in binary, you take 6C (4C is upper case L, 4C+20=6C=lower case L), 6F (same deal), and another 6C, and mash it all together in binary: 011011000110111101101100
To memorize binary is simple. Just remember all the hex-->binary values in your head (they do follow a pattern, but it's kinda hard to pick up on) and remember that 41-5A are letters, starting with A, and to get the lower case, you simply add 20 to it. Simple!