7 open source boards using the 28C256
Real designs built with the 28C256, 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.
MetaphoricV2
OldWer
204.5 × 138 mm140 parts2LCC0-1.05
AVR/Arduino6502 Computer
DomAtTheShack
216.6 × 144 mm74 parts2LNo license0
AVR/Arduino6502 DebugBoard
199.6 × 114.2 mm64 parts2LNo license0
68k nano single board computer
demik
127 × 90.8 mm49 parts2LCERN-OHL-P-2.027
FlexROM 100
bkw777
35.6 × 17.8 mm6 parts2LCC-BY-SA-4.031
28C256 SOIC to 27C256 DIP
35.6 × 17.8 mm4 parts2LCC-BY-SA-4.031
512k
homebrew8088
104 × 73.9 mm10 parts2LGPL-3.0238
The 28C256 in open source designs
The gallery holds 7 open source boards using the 28C256 from 5 GitHub repositories; a typical one measures about 127 × 90.8 mm and carries around 49 components.
100% are two-layer designs, the rest use four layers or more, and 71% carry an open source license.
The most starred is 512k by homebrew8088.
Parts used alongside the 28C256
Microcontrollers on boards using the 28C256
What boards using the 28C256 are built for
28C256: common questions
Where can I find a 28C256 reference design?
Each of the 7 boards on this page is a real design using the 28C256. 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 28C256 use?
Most are built on AVR/Arduino (2).
How big is a typical board using the 28C256?
The median is 127 × 90.8 mm, and 100% are two-layer designs.
What is the most popular open source board using the 28C256?
By GitHub stars, 512k by homebrew8088, with 238 stars.
Can I simulate one of these boards using the 28C256 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.