3 open source boards using the MC6821
Real designs built with the 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.
Dragon32Rev3
jimbro1000
253 × 169.1 mm169 parts2LMIT3
AVR/ArduinoRC6502 Terminal
tebl
99.1 × 81.9 mm45 parts2LGPL-3.0192
RC6802 CPU
99.1 × 99.1 mm53 parts2LCERN-OHL-1.26
The MC6821 in open source designs
The gallery holds 3 open source boards using the MC6821 from 3 GitHub repositories; a typical one measures about 99.1 × 99.1 mm and carries around 53 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is RC6502 Terminal by tebl.
Microcontrollers on boards using the MC6821
What boards using the MC6821 are built for
MC6821: common questions
Where can I find a MC6821 reference design?
Each of the 3 boards on this page is a real design using the 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 MC6821 use?
Most are built on AVR/Arduino (1).
How big is a typical board using the MC6821?
The median is 99.1 × 99.1 mm, and 100% are two-layer designs.
What is the most popular open source board using the MC6821?
By GitHub stars, RC6502 Terminal by tebl, with 192 stars.
Can I simulate one of these boards using the 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.