Hand drawn diagrams:

• Hard disk *1* *2*
• Memory *1*
• Plus circuit *1*

Andy's math charts:

• Calculus I *1* *2* *3*
• Calculus II *1* *2* *3* *4* *5* *6* *7*
• Multivariable calculus *1* *2* *3* *4* *5*
• Statistic *1* *2* *3*

Some computer diagrams (taken from the net):

• Computers Tree (Machines from 1945 to 1970).
• Machines before computers (from 283 b.c. - 1945).
• Linux distro timeline.
• L/Unix shell commands.
• Computer languages through the Ages.
• Central processing unit (cpu).--before--now--cpu-arch.--cpu-flash--cpu-details
• Computer memory (ram).----ram-pyramid--non-geek
• Computer speed--storage access speed.
• Linux kernel , simplified , basic1 , basic2 , System call .
• Disk drive, My diagram (crystal clear!!).
• Process, Lift cycle, In cpu , Hyper-thread.
• 2+3=?, video#1, video#2, visual , My Plus.
• Programming classification, Paradigram.