Table of Contents

ProtoBoard III

The ProtoBoard III is an 160x100mm EBC bus prototyping board that feature a generous through hole prototyping area and the typical bus buffering and address decoding required to implement an I/O peripheral.


  • Flexible 6-bit I/O address range selection
  • Pin headers for buffered address, data and control signals.
  • ECB bus pinout area for access to other ECB signals.



The board may be constructed with either the 74LS682 (preferred), 74LS684, or 74LS688 chip. The last two require a strip of 22K bussed resistors; the first does not.

Note that the footprint for the second ECB connector is for access to ECB signal lines and is not suitable for connect to another ECB board through a female vertical connector.


The current version is 17-10-05

Gerbers are here :

Kicad file are here :

Please note errata for previous version here.

Respin consideration: Add +5VDC barrel jack connector, add mounting holes, add warning for installing ECB connect on ECB2.


Board Description 770Kb12-Mar-2017
ProtoBoard III schematic 219Kb21-Oct-2017
ProtoBoard III parts list 18Kb12-Mar-2017
Jameco Part numbers 1kb18-Feb-2017
Photos from Kicad 5.4Mb02-Feb-2017
Kicad 4.4.0 project files 625Kb02-Feb-2017
ProtoBoard III errata - mandatory 24Kb04-Oct-2017

This board is licensed for hobbyist use only.

boards/ecb/protoboard_iii/protoboard_iii.txt · Last modified: 2021/03/21 01:28 by b1ackmai1er
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