hi all

i have connected a 8255 with a at89c2051 (p1 to data, p3 to rd, wr, a0 and a1, cs always to gnd)
my problem is: i can send data to portB but i can only read data from portA when i connect all pins from my bus (p1) to gnd with a 120k resistor.

is that normal??

thanks