2 layers120 × 120 mm

RJ21 RJ45 PRIMARY BREAKOUT
marrold/RJ21_RJ45_PRIMARY_BREAKOUT
A breakout board that converts RJ21 into 12x RJ45 connectors with 1 line each, and 3x RJ45 connectors with 4 lines each
20 parts4
Printed circuit boards designed in KiCad and published on GitHub, each with its parts, layers and size, its README and its files; open any of them in PCBKit.

marrold/RJ21_RJ45_PRIMARY_BREAKOUT
A breakout board that converts RJ21 into 12x RJ45 connectors with 1 line each, and 3x RJ45 connectors with 4 lines each

marrold/BBCWinchesterPro
A combined Winchester and 2nd Processor for the BBC Micro