Build An 8-Bit Computer Kit Project (Part 3) - Random Access Memory (RAM) Module and Program Counter
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Build An 8-Bit Computer Kit Project (Part 3) - Random Access Memory (RAM) Module and Program Counter, Build An 8-Bit Computer Kit Project by Ben Eater - Random Access Memory (RAM) Module and Program Counter (Kit 3 of 4) In this kit, the random access memory (RAM) stores the program the computer is executing as well as any data the program needs. Our breadboard computer uses 4-bit addresses which means it will only have 16 bytes of RAM, thus limiting the size and complexity of the programs it can run. This is by far its biggest limitation. See the build videos below. The other part of the build is the program counter (PC) which counts in binary to keep track of which instruction the computer is currently executing. See below for the videos explaining how counting in binary works. Then follow the Program Counter build videos, also below. Kit Includes:Part No.Qty.Description 1499481Switch Push Button Tactile SPST OFF-(ON) 15 VDC @ 20mA Actuator Height 0.13 Inch 1511165Capacitor Ceramic Disc 0.1AmicroF 25V A 20% 152295Ceramic Disc Capacitor 0.01AmicroF 50V A 20% Z5U 225883113-Pin SPDT Slide Switch 22837674830 Point Solderless Plug-in Breadboard with 4 Power Rails 21-26AWG ABS 33397310LED Red Diffused 5mm (T-1 3/4) 643nm 75mcd 36VA 388201Standard Slide-Raised 4 Position DIP Switch 3884218 Position DIP Switch Standard Raised Slide SPST DIP-16 462521IC 74LS00 Quad 2-Input Positive NAND Gate DIP-14 463162IC 74LS04 Hex Inverter 467714IC 74LS157 Quad 2-to-1 Line Data Selector 468181IC 74LS161 4-BIT Synchronous Binary Counter 469221IC 74LS173 4-Bit D-Type Register 3-State Output 472122IC 74LS245 Tri-State Octal Bus Transceiver 498832IC 74189 Tri-State 64 Bit RAM 69070020Carbon Film Resistor 220 Ohm 1/4 Watt 5% 6908655Resistor Carbon Film 1k Ohm 1/4 Watt 5% 69390110LED Green Diffused 5mm (T-1 3/4) 565nm 12.5mcd 60VA 69754910LED Yellow Diffused 5mm (T-1 3/4) 588nm 29mcd 50VA 2152892122 AWG Green Solid Tinned-Copper Hook-Up Wire 25 Feet 2152921122 AWG Yellow Solid Tinned-Copper Hook-Up Wire 25 Feet Resources & Downloads 74LS00 Quad NAND gate datasheet (.pdf) 74LS04 Hex inverter datasheet (.pdf) 74LS157 Quad 2-to-1 selectors/multiplexer datasheet (.pdf) 74LS173 4-bit D register datasheets (.pdf) 74189 64-bit RAM datasheet (.pdf) 74LS245 8-bit bus transceiver datasheet (.pdf) 74LS161 4-bit binary counter datasheet (.pdf) About the author, Ben Eater RAM Videos 8-bit Computer RAM Intro RAM Module Build (part 1) RAM Module Build (part 2) RAM Module Build (part 3) RAM Module Testing & Troubleshooting Program Counter Theory JK Flip-Flop JK Flip-Flop Racing Master-Slave JK Flip-Flop Binary Counter Program Counter Design and Build Program Counter Design Program Counter Build