How to Build a 4-Bit Computer on Breadboards Using Individual Transistors

Video Description

Full Parts List. Quality Breadboards (32 Breadboards Used) https://amzn.to/4iw1MVG 2N2222 Transistors (962 Transistors) https://amzn.to/41Nqg5H Breadboard 22 Gauge Wire (Around 3 packs) https://amzn.to/4iK1gnj LEDs (1 Set) https://amzn.to/4izng4c Resistors 2K 1/4 Watt Metal Film Type (Around 800) https://amzn.to/4kPbp3m Resistors 100K 1/4 Watt Metal Film Type (Around 200) https://amzn.to/4kPbp3m Other Resistors (1-Pack) https://amzn.to/4hxJbY2 Ceramic Capacitors (1 Set) https://amzn.to/4iT36ln Electrolytic Capacitors(1 set) https://amzn.to/4bZwLak Electrical Tape https://amzn.to/41NvOx3 10000mAh Rechargeable Battery Pack https://amzn.to/41WFoxQ Recommended Tools Wire Stripper https://amzn.to/4hzF6md Side Cutter https://amzn.to/4izvdq4 Scissors (To mark wire cuts and cut resistors to length) https://amzn.to/4iTaL37 Automatic Wire Stripper (I did not use this but it could be nice) https://amzn.to/4iuwaQn Good Reference Book on Building a Computer from Transistors. Computer Time Travel Book https://amzn.to/4iRcxli Consider Supporting the Global Science Network. Ko-fi (Preferred as there is zero platform fee for the transactions) https://ko-fi.com/globalsciencenetwork Patreon (If you prefer Patreon) https://www.patreon.com/c/GlobalScienceNetwork As an Amazon Associate, Global Science Network earns from qualifying purchases. Video Description: A simple 4-bit computer is built on breadboards using individual transistors. This computer is called the GSN477. This is because it was built for the Global Science Network, is 4-bit, and contains two 7-stage counters. Sections of the computer are the clock, program counter, ring counter, 10 bytes of memory, opcode register, opcode decoder, control matrix, data bus, accumulator register, output register, register B, and ALU. Circuits are built using NAND digital logic gates, XOR gates, AND gates, inverters, buffers, and tri-state buffers. Larger circuits include D flip Flops, MS D flip flops, Edge triggered JK flip flops, and MS JK flip flops. The computer shows how computers add and subtract numbers while running a simple program and this video was submitted for the #some3 competition. 0:00 Intro. 0:51 Computer overview. 1:30 Example program. 4:12 The clock 4:22 Ring Counter 4:53 Program Counter 5:33 10 Bytes of Memory 7:01 Opcode Register 7:11 Opcode Decoder 8:19 Control Matrix 9:06 Data Bus 9:44 Accumulator Register 10:21 B Register 10:51 ALU 11:15 Output Register 11:35 Building Suggestions References: Walker, J. S. Computer Time Travel: Building a Computer Processor from Discrete Transistors: A Look Back over 50 Years to the Beginning of Modern Computer Technology. Oldfangled Publishing, 2017. Malvino, Albert P. Digital Computer Electronics. 1993. Article I wrote about the 4-bit Computer. https://www.gsnetwork.com/4-bit-computer-built-on-breadboards-using-individual-transistors/