5 open source boards using the 27C256
Real designs built with the 27C256, 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.
TRS-80 Color Computer 3
qbancoffee
280 × 156.3 mm205 parts2LGPL-3.040
Tkmem128-ii
lrrosa
78.7 × 66 mm19 parts4LCERN-OHL-S-2.00
TI-CUBE-Memory
VE7PMC
99.7 × 99.7 mm17 parts4LGPL-3.010
ZX81 EPROM Upgrade
BrettHallen
21 × 45 mm5 parts2LNo license5
T2000
stonedDiscord
167.6 × 372.8 mm13 parts2LBSD-2-Clause4
The 27C256 in open source designs
The gallery holds 5 open source boards using the 27C256 from 5 GitHub repositories; a typical one measures about 99.7 × 99.7 mm and carries around 17 components.
60% are two-layer designs, the rest use four layers or more, and 80% carry an open source license.
The most starred is TRS-80 Color Computer 3 by qbancoffee.
What boards using the 27C256 are built for
27C256: common questions
Where can I find a 27C256 reference design?
Each of the 5 boards on this page is a real design using the 27C256. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
How big is a typical board using the 27C256?
The median is 99.7 × 99.7 mm, and 60% are two-layer designs.
What is the most popular open source board using the 27C256?
By GitHub stars, TRS-80 Color Computer 3 by qbancoffee, with 40 stars.
Can I simulate one of these boards using the 27C256 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.