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Build An 8-Bit Computer by Ben Eater (Part 3) - Random Access Memory (RAM) Module and Program Counter

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Build An 8-Bit Computer 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
149948
1
Switch Push Button Tactile SPST OFF-(ON) 15 VDC @ 20mA Actuator Height 0.13 Inch
151116
5
Capacitor Ceramic Disc 0.1µF 25V ±20%
15229
5
Ceramic Disc Capacitor 0.01µF 50V ±20% Z5U
2258831
1
3-Pin SPDT Slide Switch
2283767
4
830 Point Solderless Plug-in Breadboard with 4 Power Rails 21-26AWG ABS
333973
10
LED Red Diffused 5mm (T-1 3/4) 643nm 75mcd 36VA
38820
1
Standard Slide-Raised 4 Position DIP Switch
38842
1
8 Position DIP Switch Standard Raised Slide SPST DIP-16
46252
1
IC 74LS00 Quad 2-Input Positive NAND Gate DIP-14
46316
2
IC 74LS04 Hex Inverter
46771
4
IC 74LS157 Quad 2-to-1 Line Data Selector
46818
1
IC 74LS161 4-BIT Synchronous Binary Counter
46922
1
IC 74LS173 4-Bit D-Type Register 3-State Output
47212
2
IC 74LS245 Tri-State Octal Bus Transceiver
49883
2
IC 74189 Tri-State 64 Bit RAM
690700
20
Carbon Film Resistor 220 Ohm 1/4 Watt 5%
690865
5
Resistor Carbon Film 1k Ohm 1/4 Watt 5%
693901
10
LED Green Diffused 5mm (T-1 3/4) 565nm 12.5mcd 60VA
697549
10
LED Yellow Diffused 5mm (T-1 3/4) 588nm 29mcd 50VA
2152892
1
22 AWG Green Solid Tinned-Copper Hook-Up Wire 25 Feet
2152921
1
22 AWG Yellow Solid Tinned-Copper Hook-Up Wire 25 Feet

Resources & Downloads

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



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Specification Value
Design LevelIntermediate Kit


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