4 layers52.1 × 22.6 mm
Display eval
byrantech/laptop
anyon_e, a highly integrated, high end, open source laptop. Attempt the impossible.
12 parts4.3kMIT
4 layers100 × 78.7 mm
MVME712M P2 Adapter
parceval/MVME712M_P22MVME712M P2 Adapter Board Clone
- Size
- 100 × 78.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 126
- Pads
- 285
- Tracks, vias
- 895, 65
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 3 Dec 2025
- Updated
- 24 Dec 2025
Overview
MVME712M P2 Adapter is an open-source printed circuit board by parceval, from the parceval/MVME712M_P2 repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 100 × 78.7 mm with 12 parts on 126 nets, routed with 895 tracks and 65 vias.
It is built around the TRF250-120T-R2-B-0.5. Its parts include 4 connectors, 3 capacitors, 1 diode and 1 fuse. It belongs with the interfaces and adapters boards of this library.
Main components
1README
README.mdMVME712M P2 Adapter Board
An open-source hardware replacement for the Motorola MVME712M P2 Adapter.
This board is designed to interface with Motorola VME CPU modules (such as the MVME147, MVME162, MVME167, and MVME177 series) to provide the necessary signals for the MVME712M Transition Module.
Overview
The MVME712M P2 Adapter is a small passive board that plugs directly into the P2 connector on the VME backplane behind the CPU module. It breaks out the SCSI, Serial, and Centronics signals to a 50-pin header (or specific cable) that then connects to the MVME712M bulkhead/transition module.
This repository contains the KiCad design files to manufacture a modern replacement for the original Motorola part, which is often difficult to find or expensive on the used market.
Hardware Features
-
Form Factor: Standard VME P2 adapter dimensions.
-
Connectors: * 96-pin DIN 41612 (Connector for VME P2 backplane).
-
High-density or IDC headers for connection to the MVME712M transition board.
-
Compatibility: Designed for use with Motorola MVME modules and the MVME712 series transition boards.
-
Passive Design: No active components required; uses direct signal routing according to original Motorola specifications.
Project Structure
├── gerber/ # Gerbers, Drill files
└── docs/ # Pinout diagrams and reference manualsCompatibility List
This adapter is typically required for the following Motorola CPU boards when using an MVME712M transition module:
- MVME147
- MVME162 / MVME162P
- MVME167
- MVME172
- MVME177
Usage
- Fabrication: Use the provided Gerber files in the
Manufacturing/folder to order PCBs (standard 1.6mm FR4, 1oz copper is sufficient). - Assembly: Solder the 96-pin DIN 41612 connector (Female/Socket) and the appropriate shrouded headers.
- Installation: * Power down the VME chassis.
- Plug the adapter onto the P2 pins on the back of the backplane, directly behind your CPU module.
- Connect the internal ribbon cable from the adapter to your MVME712M transition module.
License
This project is released under the CERN Open Hardware Licence
Disclaimer
This is a community-driven project. While every effort has been made to ensure accuracy based on original documentation, use this hardware at your own risk. The author is not responsible for any damage to vintage VME equipment.
*Created by parceval*
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 100n | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3 |
| 3 | R_Network_Dividers_x06_SIP | Resistor_THT:R_Array_SIP8 | RN1, RN2, RN3 |
| 1 | 1N5819 | Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal | D1 |
| 1 | Conn_01x05_Pin | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical | J1 |
| 1 | Conn_02x25_Odd_Even | Connector_IDC:IDC-Header_2x25_P2.54mm_Vertical | J3 |
| 1 | DIN41612_03x32_C_Split | Connector_DIN:DIN41612_R_3x32_Male_Vertical_THT | J2 |
| 1 | DIN41612_03x32_C_Split | Connector_DIN:DIN41612_R_3x32_Female_Horizontal_THT | P2 |
| 1 | TRF250-120T-R2-B-0.5 | Fuse:Fuse_Bourns_MF-RG500 | F1 |
Questions
How big is the MVME712M P2 Adapter PCB?
It measures 100 × 78.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the MVME712M P2 Adapter use?
12 parts, built around the TRF250-120T-R2-B-0.5. 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 MVME712M P2 Adapter KiCad files?
From the parceval/MVME712M_P2 repository on GitHub, at the commit this page was made from: the board is MVME712M_P2_Adapter.kicad_pcb and its schematic MVME712M_P2_Adapter.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MVME712M P2 Adapter 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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