Athena-8-Bit-Computer
About the Athena-8-Bit-Computer PCB
Athena-8-Bit-Computer is an open source PCB design by efcroasdell, published on GitHub under the Custom license license. It is a board, with 26 components from 19 distinct parts.
Other key parts include the NE556, SN7400, SN74LS157N and CD40106BE. By type, the board carries 9 resistors, 7 capacitors, 4 ICs, 3 switches and 2 diodes.
It belongs with the test & measurement, retro computing and dev boards & breakouts designs in this gallery.
From the project
Athena is a modular 8-bit computer engineering project focused on learning processor architecture, digital logic and hardware/software interaction through hands-on design, measurement and verification. The repository contains schematics, breadboard records, test evidence, logic-analyser captures, firmware, fault reports and design documentation.
Updated 24 September 2026 for KiCad 10.0.3. Open Athena.kicadpro` and then its schematic.
- Clock (Clock.kicadsch): complete continuously wired clock circuit, including the CD40106BE STEP conditioner. - Clock logic (Clock-logic.kicadsch): functional diagram, excluded from the electrical circuit, BOM and board. - Z80 bring-up (Z80-Bringup.kicadsch): documented NMOS Z80A forced-NOP bench circuit. CPUCLK connects to the Clock sheet through the top-level hierarchy. - Manual instruction source (Manual-Instruction-Source.kicadsch): standalone experimental board, with recorded IC1 wiring and the…
Main components on the Athena-8-Bit-Computer
Athena-8-Bit-Computer bill of materials (BOM)
26 components, 19 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NE556 | U1 | |
| 1 | SN7400 | U2 | |
| 1 | SN74LS157N | U3 | |
| 1 | CD40106BE | U4 | |
| 1 | 1M | RV1 | |
| 1 | STEP (N.O.) | SW1 | |
| 1 | RUN / MANUAL | SW2 | |
| 1 | HLT | SW3 | |
| 1 | HLT | D1 | |
| 1 | ASTABLE | D2 | |
| 1 | 470pF | C1 | |
| 1 | 1uF | C2 | |
| 3 | TBC | C3, C4, C5 | |
| 2 | 100n | C6, C7 | |
| 2 | 1k | R1, R9 | |
| 1 | 1M | R2 | |
| 1 | 47k | R3 | |
| 4 | TBC | R4, R5, R7, R8 | |
| 1 | 10k | R6 |
Athena-8-Bit-Computer design files
The KiCad project lives in the efcroasdell/Athena-8-Bit-Computer repository on GitHub; these links point at the commit this page was built from.
Athena-8-Bit-Computer: common questions
How many components are on the Athena-8-Bit-Computer?
26 components, from 19 distinct parts. The full bill of materials is listed on this page.
Where can I download the Athena-8-Bit-Computer design files?
From the efcroasdell/Athena-8-Bit-Computer repository on GitHub, which has the schematic; the links under Design files point to each one.
Can I use the Athena-8-Bit-Computer design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.
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