Well guys I will try it on batteries alone, but at present I have the boards disconnected to examine all the wiring.
I do have decoupling on the power line on all ICs on the cascade clocking ccts. but will look at this again.
I'll try not to run it all at 64mHz Steve.
One important error I have found is that although the 32 line cascade cct clocking is reset at every frame, which is correct, the 48 pixel cascade clocking is also reset by the same frame pulse.
...........This is wrong !!
The 48 pixel cascade cct should be reset every line.
So I will correct this and also put in preset pots to enable me to change all the lengths of all the sync pulses............
A 125u sec long pulse at present resetting the pixel pulses, which at 19.2kHz, are only about 50u sec long seems wrong too, so changing all the lengths may show up a change in the bouncing time, or even its elimination.
Going on from what Gary said, by changing sync pulse length this will sharpen then up too, so this might remove another cause of the problem.
So plenty of investigative work to be done as the snow comes down
here in the UK Midlands
Brrrrrrr.
“One small step for a man,"......because he has Arthritis.
Albert.