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2 layers128.4 × 59.8 mmBackplane, the printed circuit board in 3D

This project is a 4-TRAM Transputer Base-Board. TRAMs are small subassemblies of transputers (or other components with INMOS links), a few discrete components, and sometimes some RAM and/or application specific…

Size
128.4 × 59.8 mm
Copper layers
2
Thickness
1.6 mm
Parts
15
Nets
189
Pads
212
Tracks, vias
5, 0
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
26 Apr 2026
Updated
28 Oct 2026

Overview

Backplane is an open-source printed circuit board by dg1vs, from the dg1vs/Transputer-Base-Board repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 128.4 × 59.8 mm with 15 parts on 189 nets, routed with 5 tracks and 0 vias.

Its parts include 5 connectors, 1 resistor and 1 diode.

README

README.md

Transputer-Base-Board

This project is a 4-TRAM Transputer Base-Board. TRAMs are small subassemblies of transputers (or other components with INMOS links), a few discrete components, and sometimes some RAM and/or application specific circuitry with a standard pinout. This base-board is a compact carrier board for up to four Transputer TRAM modules, arranged as a linear processing pipeline. The board provides the mechanical sockets, power distribution, clock generation, reset/analyse/error service wiring, and Transputer serial link routing required to operate four TRAMs as an ordered chain. The intended module order follows the pipeline ideas, that means

PipeHead → Slot 0 → Slot 1 → Slot 2 → Slot 3 → PipeTail

The external host or upstream Transputer network connects to PipeHead, entering the first TRAM in Slot 0.

I reused different ideas from different sources

Parts

15
QtyValueFootprintReferences
8MountingHoleMountingHole:MountingHole_2.7mm_M2.5_ISO7380H1, H2, H3, H4, H5, H6, H7, H8
3DIN41612_02x32_ACConnector_DIN:DIN41612_C_2x32_Female_Vertical_THTJ1, J2, J3
1+Connector_Pin:Pin_D1.0mm_L10.0mmJ4
1-Connector_Pin:Pin_D1.0mm_L10.0mmJ5
11kResistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolderR1
1LEDLED_THT:LED_D3.0mmD1

Questions

How big is the Backplane PCB?

It measures 128.4 × 59.8 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Backplane use?

15 parts. 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 Backplane KiCad files?

From the dg1vs/Transputer-Base-Board repository on GitHub, at the commit this page was made from: the board is backplane/backplane.kicad_pcb and its schematic backplane/backplane.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Backplane design in my own project?

Its repository publishes it under the GPL-3.0 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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