2 layers133 × 58.5 mm
RAM
Robert-Riordan-UCD/8_Bit_CPU_PCB
PCB version of Ben Eaters 8-bit breadboard computer
61 partsCERN-OHL-P-2.0
2 layers144.8 × 73.9 mm
PCB version of Ben Eaters 8-bit breadboard computer
- Size
- 144.8 × 73.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 68
- Nets
- 88
- Pads
- 270
- Tracks, vias
- 437, 27
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 22 Jul 2024
- Updated
- 15 Jan 2025
Overview
Control 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 144.8 × 73.9 mm with 68 parts on 88 nets, routed with 437 tracks and 27 vias.
It is built around the AT28C64B-15PI, SN74AC14N and 74HCT00D, with the 74HCT138D and 74LS163APC among its other parts. Its parts include 29 resistors, 21 diodes, 7 ICs, 5 connectors and 1 capacitor. It belongs with the retro computing and games boards of this library.
Main components
5
AT28C64B-15PI
PDIP-28-40℃~+85℃ 10 years 100,000 cycles 10ms 4.5V~5.5V 64Kbit Hardware write protection function、Software write protection function、Page write protection function Parallel Port (Parallel) PDIP-28 EEPROMMicrochip TechnologyEEPROM
SN74AC14N
PDIP-14-40℃~+85℃ 10ns@5V,50pF 2.2V~3.9V 24mA 24mA 2V~6V 2uA 4.7V 440mV 500mV~1.1V 6 6 74AC Schmitt trigger PDIP-14 Inverters ROHSTexas InstrumentsInverters
74HCT00D
SO-14-40℃~+125℃ 100mV、400mV 12ns@4.5V,50pF 2 2V 3.7V、4.4V 4 4.5V~5.5V 40uA 4mA 4mA 74HCT Series 800mV NAND Gate Overvoltage-tolerant input TTL Compatible CMOS SO-14 Logic Gates ROHSNexperiaLogic Gates
74HCT138D
SO-16-40℃~+125℃ 160uA 20ns@4.5V,50pF 3/8 4.5V~5.5V 4mA 4mA 74HCT Decoder Single Supply SOIC-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / Multiplexers
74LS163APC
DIP-164 74LS Programmable divide ratio、Reset function、Cascade counter、Synchronous counting DIP-16 Counters, Dividers ROHSTexas InstrumentsCounters, Dividers
README
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
68| Qty | Value | Footprint | References |
|---|---|---|---|
| 29 | 1k | _DownloadFootprints:CF_series_Resistors_THT | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +13 |
| 21 | LED | LED_THT:LED_D5.0mm | D1, D2, D3, D4, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21 +5 |
| 2 | AT28C64B-15PI | _DownloadFootprints:eeprom | U1, U2 |
| 2 | Conn_01x08_Pin | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3, J4 |
| 2 | SN74AC14N | _DownloadFootprints:6x_not | U3, U4 |
| 1 | 0.1u | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 74HCT00 | Package_DIP:DIP-14_W7.62mm | U7 |
| 1 | 74HCT138 | Package_DIP:DIP-16_W7.62mm | U6 |
| 1 | 74LS163 | Package_DIP:DIP-16_W7.62mm | U5 |
| 1 | Conn_01x03_Pin | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_01x07_Pin | Connector_PinHeader_2.54mm:PinHeader_1x07_P2.54mm_Vertical | J5 |
| 1 | SW_MEC_5E | _DownloadFootprints:tactile_switch | SW1 |
The 64 most common of 68 parts.
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Questions
How big is the Control PCB?
It measures 144.8 × 73.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Control use?
68 parts, built around the AT28C64B-15PI, SN74AC14N, 74HCT00D and 74HCT138D. 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 Control 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 Control/Control.kicad_pcb and its schematic ALU/ALU.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Control 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).