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Ben Eater 8- Bit Computer with Modifications

2 years ago 11852
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These are the schematics for Ben Eaters 8-Bit Computer. Modifications have been, or will be made, so that the memory is 256 Bytes instead of 16.

You can find part lists on ben Eaters website:


Computer Clock

8-Bit Program Counter

A Register

B Register

Memory Adress Register and Memory

General Overview


ALU-Addition and Subtraction

ALU-Equal Logic

ALU-Alternative Magnitude Comparasion

Control Unit


Data Register




ID Name Designator Footprint Quantity
1 1k R1,R2,R3,R4,R5 AXIAL-0.3 5
2 1M R7 AXIAL-0.3 1
3 0.01uF C1,C2 RAD-0.1 2
4 0.1uF C4,C5 RAD-0.1 2
5 1uF C6 RAD-0.1 1
6 -LM555 U3,U2,U1 DIL08 3
7 SN74LS04N Inverter U5,U2,U1,U3,U4 DIP14 5
8 SN74LS08N AND U6,U1,U5,U7,U8,U2,U9,U10,U4 DIP14 9
9 SN74LS32N OR U4,U1,U11,U3 DIP14 4
10 1M R9 RES-ADJ_3386P 1
11 6*6*12SMD Tactile Switch SW4 KEY-6.0*6.0 1
12 EG1218 SW1 SW3-2.5-11.6X4.0X5.4+2.0MM 1
13 204-10UYC/S530-A3 LED9,LED1,LED2,LED3,LED4,LED5,LED6,LED7,LED16,LED8,LED10,LED11,LED12,LED13,LED14,LED15,LED17,LED18,LED19,LED20,LED21,LED22,LED23,LED24,LED25,LED26,LED27,LED28,LED29,LED30,LED31,LED32 LED-3MM/2.54 32
14 SN74LS173AN U1,U2,U3 DIP16 3
15 74LS245N U5,U7,U3,U2 DIP20 4
16 74LS161N U8,U9,U1 DIP16 3
17 UPD43256BGU-70L U1 NONE 1
18 HD74LS83AP U1,U3,U4,U2 DIP16 4
19 SN74LS86AN U3,U4 DIP14 2
20 SN74LS85N U1,U2 DIP16 2
21 CAT28C16AL-20 U2,U3,U4,U5 DIP24-600 4




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Comments (3)

legoxx Reply

Hello Jakdimi,

this is some great work you have done here.
do you plan to create PCBs for all the parts
as well? (I have tried breadboard version but
it's somehow unreliable)

thank you

jakdimi Reply

@legoxx I have already private messaged you because I did not see this comment section. I was initially planning on making pcbs for the project, but it seems that that is actually very tedious and time consuming. At the moment I am actually building the thing on breadboards and it seems that all I have built so far works fine. The schematic for the counter is incomplete though; Some Logic for the Load command has to be added.

imranhussain.001 Reply

Ben Eater's project is so inspiring.
I am a Maths major and always wanted to learn the digital electronics.
and going to learn PCBs with jakdimi's work :)
Best wishes for both of you.

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