2 open source boards using the A1
Real designs built with the A1, 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 2 NTSC ( 26-3134B & 26-3136B)
qbancoffee
230 × 170 mm150 parts2LGPL-3.040
TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B)
baldengineer
230 × 170 mm150 parts2LCC-BY-4.0442
The A1 in open source designs
The gallery holds 2 open source boards using the A1 from 2 GitHub repositories; a typical one measures about 230 × 170 mm and carries around 150 components.
100% are two-layer designs, the rest use four layers or more, and 100% carry an open source license.
The most starred is TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) by baldengineer.
Parts used alongside the A1
What boards using the A1 are built for
A1: common questions
Where can I find a A1 reference design?
Each of the 2 boards on this page is a real design using the A1. 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 A1?
The 27C128, 6821, 74LS02, 74LS138 and A2 appear in the most repositories here.
How big is a typical board using the A1?
The median is 230 × 170 mm, and 100% are two-layer designs.
What is the most popular open source board using the A1?
By GitHub stars, TRS-80 Color Computer 2 NTSC ( 26-3134B & 26-3136B) by baldengineer, with 442 stars.
Can I simulate one of these boards using the A1 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.