1 open source board using the WD65C21/MC6821
Real designs built with the WD65C21/MC6821, 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.
davischrisThe WD65C21/MC6821 in open source designs
The gallery holds 1 open source boards using the WD65C21/MC6821 from 1 GitHub repository; a typical one measures about 191.5 × 97.6 mm and carries around 71 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is OpenAC1 by davischris.
Microcontrollers on boards using the WD65C21/MC6821
WD65C21/MC6821: common questions
Where can I find a WD65C21/MC6821 reference design?
Each of the 1 boards on this page is a real design using the WD65C21/MC6821. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the WD65C21/MC6821 use?
Most are built on PIC (1).
How big is a typical board using the WD65C21/MC6821?
The median is 191.5 × 97.6 mm, and 100% are two-layer designs.
What is the most popular open source board using the WD65C21/MC6821?
By GitHub stars, OpenAC1 by davischris, with 4 stars.
Can I simulate one of these boards using the WD65C21/MC6821 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.