Thanx
I already designed the cct with AT89C8252.
I had lots of timing sensitive applications. Just worried the chip is 2 slow to handle all these timers.
I'm using the onchip eeprom and quite a bit of ram . 150 bytes of ram so far and still growing. I'm also using the onchip serial port and another serial port in software.
just in case it didnt work it would be nice if i can have a direct replacement for the chip without modifying the pcb which i already made 5 of.
Thanks again
Mahmood