2 layers160 × 100 mm
2 layers160 × 100 mm
Busext
Noah1989/loopmicro2An 8-bit microcomputer for the 21st century
- Size
- 160 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 14
- Nets
- 158
- Pads
- 290
- Tracks, vias
- 537, 39
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 15 May 2019
- Updated
- 3 Aug 2026
Overview
Busext is an open-source printed circuit board by Noah1989, from the Noah1989/loopmicro repository on GitHub, published under the MIT licence. It is a 2-layer board of 160 × 100 mm with 14 parts on 158 nets, routed with 537 tracks and 39 vias.
It is built around the 74HC244D, 74HC245D and BAT46. Its parts include 5 capacitors, 4 ICs, 2 connectors, 1 resistor and 1 diode.
Main components
3
74HC244D
SO-20-300mil-40℃~+125℃ 160uA 2 2V~6V 4 6mA 6mA 74HC 9ns@5V,15pF Tri-State Unidirectional SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers74HC245D
SO-20-300mil-40℃~+125℃ 1 160uA 2V~6V 7.8mA 7.8mA 74HC 8 9ns@4.5V,50pF Bidirectional Tri-State SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
BAT46
DO-35Schottky DiodesSTMicroelectronics
README
README.mdLoop Microcomputer
a minmal 8-bit machine that is...
-
... independent:
- contains all the tools required to design another version of itself
- does not require high soldering skills, uses through-hole parts only
- uses only "evergreen" parts that have been in production for decades and are still made today
-
... aproachable:
- simple through reduction
- NO hidden complexity behind brittle abstractions
- open source and self-documenting
-
... powerful, with it you can:
- learn/teach how computers work
- design electronics
- control CNC machines / 3d printers
- play games
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 100nF | Capacitor_THT:C_Rect_L7.2mm_W2.5mm_P5.00mm_FKS2_FKP2_MKS2_MKP2 | C1, C2, C3, C4 |
| 3 | 74HC244 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U1, U2, U3 |
| 2 | C96ABC | Connector_DIN:DIN41612_C_3x32_Male_Horizontal_THT | J1, J2 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 74HC245 | Package_DIP:DIP-20_W7.62mm_Socket_LongPads | U4 |
| 1 | BAT46 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | CP | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C5 |
| 1 | LOGO | common:logo | G*** |
Questions
How big is the Busext PCB?
It measures 160 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Busext use?
14 parts, built around the 74HC244D, 74HC245D and BAT46. 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 Busext KiCad files?
From the Noah1989/loopmicro repository on GitHub, at the commit this page was made from: the board is hardware/ecb-prototype/busext/busext.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Busext design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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