who has tried over clocking the at89c51 in KEIL C? how fast can it go? 10% 20% 100%? post your results.
going to another processor is not possible and i have no time for a big learning curve.
Actually what you are trying to do is near to impossible on that old 8051. You really should take a good advice and switch architecture. A big learning curve is the best that can happen to you. You are heading towards the wall of failing now.