Try to implement a i8255 design, its a part of solved the replacement of old ULA chipset for retro computers, have issue with 'event code as I understand the Quartus II only supports the synthesis subset of vhdl.
VHDL event : It relates to signals and it occurs on a signal if the current value of that signal changes. In other words, an event on a signal is a change of the signal's value. So should I store the...