18f452 help

[eprog061982]

ı am using a 18f542.in the programme : ps-2 interrupt control and read a data , write to dot matrix display.ps-2 interrupt worked and read data sucssesfully,but didn't write to dot matrix display.data's are to go bad.

but the same program worked 16877 .what diffrence of 18f452 than 16f877. ı use basic code .can you help me please

[mister_e]

can be tons of thing, post the ofendent code here first.