Loss of INT6 at Even CIA

The following symptoms are observed if the INT6 signal is not available to the EVEN CIA, which could be as a result of a bad trace, or pin or and issue with the CIA chip itself.

Amiga is still able to boot.

Music not audible in certain games and demos.
In Amiga Tesk Kit, the CIA tests throws the following errors:

A500 test - INT6 pin 21 on Even CIA isolated.

ATK CIA tests failed.

Sound/Music test only works when INT6 was connected.

In Amiga Test Kit v1.9 , in the Audio tests, the mod tracker music is not audible. However, the tone test (500Hz Sine) is audible as it does not need timers.

There are CIA based trackers, and vblank based trackers. Depending on the tracker type depends on whether it will be impacted by a loss of INT6 at the EVEN CIA.