98 Port_VDPData
99 Port_VDPAddress out
99 Port_VDPStatus in
9a Port_VDPPalette out
9b Port_VDPRegisterWrite out
a0 Port_PSGRegister out
a1 Port_PSGData out
a2 Port_PSGData in
a9 Port_Keyboard in
fc Port_RAMMapper0 out
fd Port_RAMMapper1 out
fe Port_RAMMapper2 out
ff Port_RAMMapper3 out