4 layers50 × 30 mm
4 layers76.8 × 54 mm
ProtoA
X65/schematic8X65 hardware schematic
- Size
- 76.8 × 54 mm
- Copper layers
- 4
- Thickness
- 1.58 mm
- Parts
- 42
- Nets
- 108
- Pads
- 333
- Tracks, vias
- 840, 380
- Pours
- 478
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 13 Mar 2024
- Updated
- 3 Aug 2025
Overview
ProtoA is an open-source printed circuit board by X65, from the X65/schematic repository on GitHub. It is a 4-layer board of 76.8 × 54 mm with 42 parts on 108 nets, routed with 840 tracks and 380 vias.
It is built around the SN74LVC245APWR(LX), SN74LVC02APWR-TP and 74LVC139D, with the EXB-2HV331JV among its other parts. Its parts include 15 capacitors, 9 ICs, 8 resistors and 6 connectors. It belongs with the retro computing and games boards and the RP2040 and RP2350 boards of this library.
Main components
4
SN74LVC245APWR(LX)
TSSOP-20Buffers, Drivers, Receivers, Transceiverslingxingic
SN74LVC02APWR-TP
TSSOP-14TSSOP-14 Logic Gates ROHSTECH PUBLICLogic Gates
74LVC139D
SO-16-40℃~+125℃ 0.1uA 1.65V~3.6V 2.5ns@3.3V,50pF 74LVC Decoder SO-16 Signal Switches, Multiplexers, Decoders ROHSNexperiaSignal Switches / Encoders & Decoders / MultiplexersEXB-2HV331JV
SMD-16P,1.6x3.8mm16 330Ω 63mW 8 ±200ppm/℃ ±5% SMD-16P,1.6x3.8mm Resistor Networks, Arrays ROHSPanasonicResistor Networks & Arrays
README
README.mdX65
Modern 8-bit microcomputer
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C4, C6, C8, C10, C11, C13, C14 |
| 7 | 2u2 | Capacitor_SMD:C_0603_1608Metric | C1, C3, C5, C7, C9, C12, C15 |
| 4 | 56k | Resistor_SMD:R_0402_1005Metric | R3, R4, R5, R6 |
| 3 | 74LVC245 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U7, U8, U9 |
| 3 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FM1, FM2, FM3 |
| 2 | 220R | Resistor_SMD:R_0402_1005Metric | R1, R2 |
| 2 | 22R | Resistor_SMD:R_0402_1005Metric | R8, R9 |
| 2 | ESP-PSRAM64H | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3, U4 |
| 1 | 330R | Resistor_SMD:R_Array_Convex_8x0602 | RN1 |
| 1 | 74LVC02 | Package_SO:TSSOP-14_4.4x5mm_P0.65mm | U5 |
| 1 | 74LVC139 | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U6 |
| 1 | CPU_DBG | Connector_PinHeader_1.00mm:PinHeader_1x08_P1.00mm_Vertical | J5 |
| 1 | DATA_BUS | Connector_PinHeader_1.00mm:PinHeader_1x08_P1.00mm_Vertical | J3 |
| 1 | EXT | Connector_PinHeader_1.00mm:PinHeader_1x02_P1.00mm_Vertical | J2 |
| 1 | MEM_DBG | Connector_PinHeader_1.00mm:PinHeader_1x08_P1.00mm_Vertical | J4 |
| 1 | PIX | Connector_IDC:IDC-Header_2x04_P2.54mm_Vertical | J6 |
| 1 | PWR_OUT | Connector_PinHeader_1.00mm:PinHeader_1x04_P1.00mm_Vertical | J1 |
| 1 | RP2040-PICO30 | RaspberryPi_Pico:RaspberryPi_Pico_Common | U1 |
| 1 | W65C816SxP | Package_DIP:DIP-40_W15.24mm_Socket | U2 |
Questions
How big is the ProtoA PCB?
It measures 76.8 × 54 mm and has 4 copper layers, 1.58 mm thick.
What parts does the ProtoA use?
42 parts, built around the SN74LVC245APWR(LX), SN74LVC02APWR-TP, 74LVC139D and EXB-2HV331JV. 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 ProtoA KiCad files?
From the X65/schematic repository on GitHub, at the commit this page was made from: the board is protoA/protoA.kicad_pcb and its schematic protoA/protoA.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ProtoA design in my own project?
Its repository states no licence, so its author keeps all rights: ask X65 before reusing the design.
More from X65/schematic
1Similar boards
- 6 layers156 × 54.5 mm
Filled growth band43-1
AxelMcKenna/AFX-1000
RMX-1000-inspired effects processor for macOS, AU and VST3, built on a shared C++20 engine. Standalone Daisy Seed 3 hardware with two main PCBs and a custom housing is in development.
255 parts1 - 2 layers65 × 56 mm
- 2 layers35 × 103 mm
- 2 layers160 × 114.3 mm
VGAGAL
flypie/Ace-2019
Reimplimentation of the Jupiter ACE with slightly more modern hardware. https://www.jupiter-ace.co.uk/ the KiCad versions are the up to date designs which are available at https://jupiterdeuce.blogspot.com and…
77 parts13GPL-3.0 - 2 layers104 × 46 mm
RC2014-512K RAMROM V2
dennisperry/RC2014_PCBs
A group of RC2014 PCBs I've designed to expand my system
17 parts - 4 layers105.5 × 83 mm
Board main
bmurmann/EE628
EE 628: Analysis and Design of Integrated Circuits (University of Hawaiʻi at Mānoa)
87 parts203MIT - 4 layers26.7 × 55.2 mm
Sombrero MSX Goa'uld
jabadiagm/MSXgoauldSD_tn20k
MSX Goa'uld board with Tang Nano 20k and SD support
17 parts41GPL-3.0 - 6 layers85.9 × 77.5 mm
Frob2354
tschak909/frob-modern
The Frob, An Apple II Atari 2600 Development System, re-made as an RP2354 based device.
80 parts8