Link to this headingGates

Building a Modern Computer From First Principles
Game to Create all Circuits

Link to this headingNot Gate

            +5V
             | 
          Resistor
             |
             |----- Out
             |
            /(C)
In ---(B) Transistor
            \(E)
             |
             |
          Ground

Link to this headingOR Gate

             +5V
             | 
          Resistor        
             |          
             |--------------\            
             |              |
             |              |
             |             /(C)
             |  In A ----(B) Transistor
             |             \(E)
             |              |
             |              |
             |              |
             |              |
            /(C)            |
In ---(B) Transistor        |
            \(E)            |
             |              |
             |--------------+---- Out
             |
          Ground

Link to this headingNOR Gate

             +5V
             |
             |
         Resistor
             |
             +----- Out
             |
             |
             +----------------\  
             |                |
             |                |
             /(C)             |
 In A -----(B) Transistor     |
             \(E)             |
             |                |
             |                |
             |               /(C)           
             |    In B -----(B) Transistor       
             |               \(E)         
             |                |
             |                |
             |                |
          Ground           Ground

Link to this headingNAND gate

              +5V
              | 
           Resistor        
              |          
              +------------Out            
              |
              |
             /(C)
  In A -----(B) Transistor
             \(E)
              |
              |
              |
              |
             /(C)
  In B -----(B) Transistor
             \(E)
             |
             |
             |
          Ground

Link to this headingAND gate

             +5V
             |
             |             
             /(C)
 In A -----(B) Transistor
             \(E)
             |             
             |             
            /(C)           
 In B -----(B) Transistor       
            \(E)           
             |              
             +----- Out
             |
             |
         Resistor
             |
             |
          Ground

Link to this headingXOR Gate

            -------------------|-----\
           /                   | NAND |---\
Input A ------|-----\      ----|-----/     ---|-----\
              | NAND |----/                   | NAND |---- Output
Input B ------|-----/     \----|-----\     ---|-----/
          \                    | NAND |---/
           --------------------|-----/

Link to this headingMultiplexer

Input A -----------------------|-----\
          ----------------     | NAND |---\
         /  --|-----\     \----|-----/     ---|-----\
Select  ----| | NAND |----                    | NAND |---- Output
            --|-----/     \----|-----\     ---|-----/
                               | NAND |---/
Input B -----------------------|-----/

Link to this headingDeMultiplexer

Input A -------------------------------|-----\      ---|-----\
        |                              | NAND |----|   | NAND |---- Output A
        |              --|-----\    ---|-----/      ---|-----/
        |  Select  ----| | NAND |--/                  
        |           \  --|-----/     --|-----\      ---|-----\
        |            ---------------/  | NAND |----|   | NAND |---- Output B
        \------------------------------|-----/      ---|-----/

Link to this headingHalf Adder

            --------------------|-----\ 
           /                    | NAND |---\
          |              -------|-----/     -----\
          |              |                        -----\
Input A -------|-----\   |  ----|-----\                 ---|-----\
               | NAND |--|--|   | NAND |--- Carry          | NAND |--- Sum
Input B -------|-----/   |  ----|-----/                 ---|-----/
          |              |                        -----/
          |              -------|-----\     -----/
           \                    | NAND |---/  
            --------------------|-----/

Link to this headingFull Adder

Carry In -----------------------------|------------|--- Sum 
                                      | Half Carry |
Input A  ---|------------|--- Sum ----|------------|--- Carry ---\----\
            | Half adder |                                        | OR |--- Carry
Input B     |------------|--- Carry -----------------------------/----/

Link to this headingALU

Link to this headingSet Reset Flip-Flop

Reset -------------------|-----\ 
                         | NAND |-------- Q
                   ------|-----/      |
                   |                  |
               -----------------------/
               |   |----------------
               |                    \
               ----------|-----\    |
                         | NAND |--------- Not Q
 Set --------------------|-----/

Link to this headingData Flip-Flop

Data --------------------|-----\ 
       |                 | NAND |------|-----\
       |              ---|-----/       | NAND |------ Data
       |              |             ---|-----/   |
       |              |             |            |
       |              |             |     /------- 
       |     Clock ---|         --- | ----
       |              |         |   |
       |              |         |    -------------
       |              |          ------|-----\   |
       | |----\       ---|-----\       | NAND |------ Not(Data)
       --| NOT >---      | NAND |------|-----/
         |----/    \-----|-----/

Link to this headingRAM

Link to this headingPC