UH400. UH400a, UH400TM v3.2

Same as v6.0, but for older models with Philips PLL and 11.3000 MHz crystal.

UH400. UH400a, UH400TM v5.5

Backport of version 6.5 to the 5.x branch, for use in UH400TM units with the older PLL.

UH400. UH400a, UH400TM v6.5

Added support for blocks 470, 19 and 944.

UH400. UH400a, UH400TM v6.4

Lowered corner frequency of subsonic filter, to preserve low frequency performance required by UH400TM model. Other models roll off low frequencies in analog, such that this change to the digital filter has virtually no effect.

Note: It was not necessary to backport this feature to the 3.x or 5.x branches, because no UH400TM has ever used the old PLL.

UH400. UH400a, UH400TM v4.4

Same as v6.4, but for older models with National PLL and 11.3000 MHz crystal.