2 open source boards using the W65C21N
Real designs built with the W65C21N, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
RP2040/RP2350Econopet
DLehenbauer
262.5 × 108 mm284 parts2LCC0-1.018
RP2040/RP2350Commodore pet clone
262.5 × 108 mm258 parts2LCC0-1.013
The W65C21N in open source designs
The gallery holds 2 open source boards using the W65C21N from 2 GitHub repositories; a typical one measures about 262.5 × 107.9 mm and carries around 271 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is Econopet by DLehenbauer.
Parts used alongside the W65C21N
Microcontrollers on boards using the W65C21N
What boards using the W65C21N are built for
W65C21N: common questions
Where can I find a W65C21N reference design?
Each of the 2 boards on this page is a real design using the W65C21N. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
What parts are used alongside the W65C21N?
The 74LS145, 74LS245, AS6C1008, LM317AG-TN3-R and RP2040 appear in the most repositories here.
Which microcontrollers do boards using the W65C21N use?
Most are built on RP2040/RP2350 (2).
How big is a typical board using the W65C21N?
The median is 262.5 × 107.9 mm, and 100% are two-layer designs.
What is the most popular open source board using the W65C21N?
By GitHub stars, Econopet by DLehenbauer, with 18 stars.
Can I simulate one of these boards using the W65C21N before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.