i need to know what is the address of the boot vector,i must change it to 0xFC.
No, you do not, the parallel programmer will have a separate entry for it.
why do i loose boot vector?how can i avoid this disgusting situation??
The bootvector gtet lost when you use capacitor reset, use a supervisor chip.
i'll program an EPROM with the coorecy boot vector and when i loose boot vector during ISP operation, i'll pull-up EA pin and connect EPROM to my p89c51rc2. ???? does it work???
No
if someone has another idea except parallel programing please tell me!
Read the articles on my "user page" <----

Erik


thanks