405 to 625 conversion

[ppppenguin]

Having done the hard stuff, I tidied up the VHDL and it's stopped working. All the new sync stuff is still OK - I can see it on test points - but somehow the video isn't being written to the framestore. All the pulses that drive the framestore seem to be there and I can write a test pattern to the framestore from the debug system.

It's obviously something silly but finding it is driving me mad. Probably best to leave it an come back in the morning.