4 open source boards using the 6581
Real designs built with the 6581, 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.
C64 Motherboard KU-14194HB
baldengineer
390.2 × 180.3 mm220 parts2LCC-BY-4.0442
C64-250407-Replica
bwack
390 × 179.8 mm214 parts2LCERN-OHL-1.2114
KU-14194HB-RevB
390.2 × 180.3 mm221 parts2LNo license67
AVR/Arduino6502 ACE Board
acwright
335 × 250 mm183 parts2LCERN-OHL-P-2.012
The 6581 in open source designs
The gallery holds 4 open source boards using the 6581 from 4 GitHub repositories; a typical one measures about 390.1 × 180.3 mm and carries around 217 components.
100% are two-layer designs, the rest use four layers or more, and 75% carry an open source license.
The most starred is C64 Motherboard KU-14194HB by baldengineer.
Parts used alongside the 6581
Microcontrollers on boards using the 6581
What boards using the 6581 are built for
6581: common questions
Where can I find a 6581 reference design?
Each of the 4 boards on this page is a real design using the 6581. 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 6581?
The 2114, 2332A, 2364A, 4164-2 and 556 appear in the most repositories here.
Which microcontrollers do boards using the 6581 use?
Most are built on AVR/Arduino (1).
How big is a typical board using the 6581?
The median is 390.1 × 180.3 mm, and 100% are two-layer designs.
What is the most popular open source board using the 6581?
By GitHub stars, C64 Motherboard KU-14194HB by baldengineer, with 442 stars.
Can I simulate one of these boards using the 6581 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.