2 layers144.8 × 73.9 mm
Control
Robert-Riordan-UCD/8_Bit_CPU_PCB
PCB version of Ben Eaters 8-bit breadboard computer
68 partsCERN-OHL-P-2.0
2 layers81.5 × 52.5 mm
ClockModule
Robert-Riordan-UCD/8_Bit_CPU_PCBPCB version of Ben Eaters 8-bit breadboard computer
- Size
- 81.5 × 52.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 34
- Nets
- 46
- Pads
- 125
- Tracks, vias
- 126, 0
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 22 Jul 2024
- Updated
- 15 Jan 2025
Overview
ClockModule is an open-source printed circuit board by Robert-Riordan-UCD, from the Robert-Riordan-UCD/8_Bit_CPU_PCB repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 2-layer board of 81.5 × 52.5 mm with 34 parts on 46 nets, routed with 126 tracks and 0 vias.
It is built around the B3U-1000P. Its parts include 9 resistors, 8 capacitors, 6 ICs, 3 diodes and 2 switches. It belongs with the retro computing and games boards of this library.
Main components
1README
README.md8-Bit PCB CPU
This is my version of Ben Eaters 8-bit breadboard SAP-1 CPU, converted to a PCB. I have made some minor changes as I could not find all of the components as listed in Ben's part list.
Video of the computer running
https://youtube.com/shorts/QNcSWgcGv9o?si=QzoUVq9Kj8X1f4Rs
Major Changes
Random Access Memory
- RAM IC's have been replaced with ATMega328-PU's. This should allow me to have persistant programs between power cycles.
License
CERN Open Hardware Licence Version 2 - Permissive
Parts
34| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 1k | _DownloadFootprints:CF_series_Resistors_THT | R1, R2, R3, R4, R6, R7, R8, R9 |
| 4 | 0.1uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C3, C5, C6, C8 |
| 3 | 0.01uF | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1, C4, C7 |
| 3 | LED | LED_THT:LED_D5.0mm | D1, D2, D3 |
| 3 | LM555xN | Package_DIP:DIP-8_W7.62mm | U1, U2, U6 |
| 1 | 1M | _DownloadFootprints:R_var | RV1 |
| 1 | 1M | _DownloadFootprints:CF_series_Resistors_THT | R5 |
| 1 | 1uF | _DownloadFootprints:Cp_2mm_pin_spacing | C2 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | NOT | _DownloadFootprints:6x_not | U4 |
| 1 | OR | _DownloadFootprints:4x_or | U3 |
| 1 | SW_SPDT | 8BitCPUFootprints:DoubleThrowSwitch | SW1 |
| 1 | TactileSwitch | _DownloadFootprints:tactile_switch | S1 |
| 1 | ~ | 8BitCPUFootprints:4x_and | U5 |
The 30 most common of 34 parts.
Questions
How big is the ClockModule PCB?
It measures 81.5 × 52.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ClockModule use?
34 parts, built around the B3U-1000P. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the ClockModule KiCad files?
From the Robert-Riordan-UCD/8_Bit_CPU_PCB repository on GitHub, at the commit this page was made from: the board is ClockModule/ClockModule.kicad_pcb and its schematic ALU/ALU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ClockModule design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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