Hi

thank you all. I would try a 11,059 or a 22,1184MHz XTAL. Another Question: When i programmed my own software into the µC then i have to write the startvector in one of the Registers and then change a bit in another register of the Chip. Then my programm starts at power-up. But how i can jump to the bootstraploader on powerup then without do this in hardware (The things with the PSEN, ALE and EA pins)? Do i have to programm it like this an use a portpin:

jb P3.3,normal
ljmp bootloader(0FC03 i think)
normal:
{my programm}

Ore is there another way?

Matthias