IFBT1 v5.0

Switched to National PLL. Use with Rev. L (2005) and newer boards only.

IFBT1 v4.2

Added ability to display TV channel and frequency as two hex digits. This upgrade may be applied to units currently running firmware v3.0 and newer.

IFBT1 v2.0

First version to use PIC micro-controller and Philips PLL. Use version 4.2 for more features.

IFBT1 v1.6

Last version to use Motorola micro-controller.