Fourth release
This release enhances both the FPGA and Linux GUI application to support a fixed sampling rate of 40 MSPS (the maximum supported by the current ADC chip).
In addition there are fixes to the stability of the PIC functionality and the ability to use 4800bps serial.
Clock stability in the FPGA code has been greatly improved and all Domesday Duplicators should be upgraded to this release.
For details of the Domesday Duplicator please see: https://www.domesday86.com/?page_id=978
Note: Board version 2_2 is recommended for this release. Board 2_0 may show DC offset stability issues with the greatly increased sample rate.