This may only be of interest to some of you, it's not exactly a chipmusic effect, but.. well, maybe someone will make good use of it.
I've had this WIP VST effect around with which I tried to add bad reception effects and distortion like on a SW radio on a signal. I recently used it in a track and thought maybe others would like it.
The emulation of the effects/filters/etc are not perfect, but sufficient I think. At least for some settings you can produce a pretty good approximation.
Controls are very simple. There's an on/off switch in the upper left corner. The small dial next to it controls the dry/wet mix.
For the actual effect, I've tied all effect setting to a single value, so you can explore settings for something nice. 
The button row on top selects the 'band', which is of course just different effect offsets. The big knob on the right controls the 'station', which adds to the same effect offset, but in finer steps.
I recommend additional filtering of the signal before input, you can get nicer results like that.
This is what it sounds like with an old Billy Murray song 
