2 layers149.9 × 111.8 mm
2 layers91.4 × 88.9 mm
Homebrew 8-bit computer project
- Size
- 91.4 × 88.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 44
- Pads
- 97
- Tracks, vias
- 317, 26
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 14 Jun 2023
- Updated
- 29 Mar 2025
Overview
Mmu is an open-source printed circuit board by isolenta, from the isolenta/bc80 repository on GitHub. It is a 2-layer board of 91.4 × 88.9 mm with 10 parts on 44 nets, routed with 317 tracks and 26 vias.
It is built around the 74LS32SC and 74LS04PC. Its parts include 6 ICs and 3 connectors.
Main components
2Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 74LS08 | Package_DIP:DIP-14_W7.62mm_LongPads | U2, U3, U6 |
| 2 | 74LS32 | Package_DIP:DIP-14_W7.62mm_LongPads | U4, U5 |
| 2 | Conn_01x03_Male | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J2, J3 |
| 1 | |||
| 1 | 74LS04 | Package_DIP:DIP-14_W7.62mm_LongPads | U1 |
| 1 | Conn_01x06_Male | Connector_PinHeader_2.54mm:PinHeader_1x06_P2.54mm_Vertical | J1 |
More from isolenta/bc80
1Similar boards
- 2 layers237.5 × 102.9 mm
Instruction
jes/scamp-cpu
A homebrew 16-bit CPU with a homebrew Unix-like-ish operating system.
112 parts301Unlicense - 2 layers370.8 × 298.5 mm
8 Bit Computer
The-Invent0r/8-bit-Computer-PCB
These are the KiCAD files for my 8-Bit Computer.
323 parts142 - 2 layers134.6 × 208.3 mm
- 2 layers114.3 × 106.7 mm
- 2 layers407 × 184 mm
TRS-80-Model I G E1
RetroStack/TRS-80-Model-I-G-E1
Hardware Replica of the TRS-80 Model I Revision G
230 parts57MIT - 4 layers337.6 × 105.7 mm
ISA CGA
hkzlab/CGA_Redux
The Color Graphics Adapter Redux board is a more or less faithful clone of the original IBM CGA, based on the original schematics
170 parts56 - 2 layers350 × 224.3 mm
- 2 layers100 × 100 mm
Questions
How big is the Mmu PCB?
It measures 91.4 × 88.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Mmu use?
10 parts, built around the 74LS32SC and 74LS04PC. 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 Mmu KiCad files?
From the isolenta/bc80 repository on GitHub, at the commit this page was made from: the board is bc80/mmu/mmu.kicad_pcb and its schematic bc80/bc80.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Mmu design in my own project?
Its repository states no licence, so its author keeps all rights: ask isolenta before reusing the design.