"The author of the firmware for the Plan B Model 28 Tap Clock, is offering an upgrade that enhances the ability of the unit to synchronize with external clock signals.A web page listing two service points (US/UK) for acquiring this firmware, and plans for a DIY addition to the module for better phase synchronization , are explained.
This effort intends to be "pro bono" with no charges for the firmware itself and the service points charging only what it costs to perform the required modifications rang ing from; 1) Sending a replacement microcontroller; 2) adding a transistor circuit (for those loath to DIY); 3) For some units, crystal/micro remediation.
You can reference the upgrade at:
http://www.sdiy.org/philgallo/Tap/28.html
While not factory subsidized, the modification itself is factory authorized."
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