Eater 8-bit computer

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The Eater 8-bit computer (aka the SAP-1 {Simple As Possible} version 1) is a breadboard computer created by Ben Eater. I have decided to make my own version of the computer and will be providing information on its progress in this article.

Computer modules

Complete parts list

  • 14 x Breadboard
  • 1 x 22 AWG Solid Tinned-Copper Hook-Up Wire
  • 10 x 1kΩ resistor
  • 9 x 10kΩ resistor
  • 1 x 100kΩ resistor
  • 24 x 470Ω resistor
  • 1 x 1MΩ resistor
  • 1 x 1MΩ potentiometer
  • 6 x 0.01µF capacitor
  • 16 x 0.1µF capacitor
  • 1 x 1µF capacitor
  • 4 x 555 timer IC
  • 2 x 74LS00 (Quad NAND gate)
  • 1 x 74LS02 (Quad NOR gate)
  • 5 x 74LS04 (Hex inverter)
  • 3 x 74LS08 (Quad AND gate)
  • 1 x 74LS32 (Quad OR gate)
  • 1 x 74LS107 (Dual JK flip-flop) Note: The videos use the 74LS76 which is extremely difficult to find. The 74LS107 is functionally equivalent but be careful, it has a different pinout.
  • 2 x 74LS86 (Quad XOR gate)
  • 1 x 74LS138 (3-to-8 line decoder)
  • 1 x 74LS139 (Dual 2-line to 4-line decoder)
  • 4 x 74LS157 (Quad 2-to-1 line data selector)
  • 2 x 74LS161 (4-bit synchronous binary counter)
  • 8 x 74LS173 (4-bit D-type register)
  • 2 x 74189 (64-bit random access memory)
  • 6 x 74LS245 (Octal bus transceiver)
  • 1 x 74LS273 (Octal D flip-flop)
  • 2 x 74LS283 (4-bit binary full adder)
  • 3 x 28C16 EEPROM
  • 3 x Double-throw toggle switch
  • 3 x Momentary 6mm tact switch
  • 1 x 8-position DIP switch
  • 1 x 4-position DIP switch
  • 44 x Red LED
  • 8 x Yellow LED
  • 12 x Green LED
  • 21 x Blue LED
  • 4 x Common cathode 7-segment display

External links