4 layers98.8 × 50.1 mm Memory, the printed circuit board in 3D

Memory

Repo to track my 8-bit computer progress

Size: 98.8 × 50.1 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 29
Nets: 54
Pads: 218
Tracks, vias: 445, 13
Pours: 2
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 14 Jun 2024
Updated: 17 Sep 2025

Overview

Memory is an open-source printed circuit board by georgesleen, from the georgesleen/8-BitComputer repository on GitHub. It is a 4-layer board of 98.8 × 50.1 mm with 29 parts on 54 nets, routed with 445 tracks and 13 vias.

It is built around the 74LS173SC, AS7C164A-15PCN and AT28C64B-15PU, with the 74LS00SC among its other parts. Its parts include 8 resistors, 7 ICs, 4 connectors and 2 capacitors. It belongs with the retro computing and games boards of this library.

Main components

README

README.md

Custom 8-Bit Computer

Repository showcasing a simple 8 bit computer built around the 7400 series ICs.

Heavily inspired by Ben Eater's 8-Bit computer series on youtube, with additional support from Digital Computer Electronics by Albert Paul Malvino

Parts

Qty	Value	Footprint	References
8	220	Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder	R1, R2, R3, R4, R5, R6, R7, R8
8	LED	LED_SMD:LED_1206_3216Metric_Pad1.42x1.75mm_HandSolder	D, D2, D3, D4, D5, D6, D7, D8
2	0.1 uF	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C1, C2
2	74LS173	Package_DIP:DIP-16_W7.62mm_Socket_LongPads	U2, U4
2	AS7C164A-15PCN	AS7C164A-15PCN:DIP1524W51P254L3632H394Q28N	IC2, IC4
2	AT28C64B-15PU	AT28C64B-15PU:DIP1556W56P254L3702H483Q28N	IC1, IC3
1	74LS00	Package_DIP:DIP-14_W7.62mm_Socket_LongPads	U1
1	Bus LB	Connector_Molex:Molex_PicoBlade_53048-0810_1x08_P1.25mm_Horizontal	J1
1	Bus UB	Connector_Molex:Molex_PicoBlade_53048-0810_1x08_P1.25mm_Horizontal	J2
1	Control	Connector_Molex:Molex_PicoBlade_53048-0410_1x04_P1.25mm_Horizontal	J3
1	Power	Connector_Molex:Molex_PicoBlade_53048-0410_1x04_P1.25mm_Horizontal	J4

Questions

How big is the Memory PCB?

It measures 98.8 × 50.1 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Memory use?

29 parts, built around the 74LS173SC, AS7C164A-15PCN, AT28C64B-15PU and 74LS00SC. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Memory KiCad files?

From the georgesleen/8-BitComputer repository on GitHub, at the commit this page was made from: the board is Schematics/Memory/Memory.kicad_pcb and its schematic Schematics/ALU/ALU V1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Memory design in my own project?

Its repository states no licence, so its author keeps all rights: ask georgesleen before reusing the design.

Category and platform

Retro computing and games

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/georgesleen-8-bitcomputer-memory" title="Memory in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/georgesleen-8-bitcomputer-memory.jpg" alt="Memory" width="1200" height="900">

A picture that opens the board, for a README

[![Memory](https://pcbkit.io/embed/boards/georgesleen-8-bitcomputer-memory.jpg?size=s)](https://pcbkit.io/boards/georgesleen-8-bitcomputer-memory)

Source

Repository: georgesleen/8-BitComputer
Board file: Schematics/Memory/Memory.kicad_pcb
Commit: 138c1bc
Licence: Not stated

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