Where can I find the firmware for the AVR Oscilloscope Clock 3.3a?
The firmware for version 3.3a is available on the main Oscilloscope Clock page, under “Technical Information”, link “AVR Clock Flash Image V3.3a (Serial Download)”. This firmware version is the clock application itself (excluding the boot loader) and can be downloaded to the clock using a serial cable (this requires an RS232 level converter and the program avrprog.exe). Upgrading from the Basic version to the Enhanced version is one way of adding the RS-232 Level Conversion Circuit.