Int 61 Fn 5B U - Pc/tcp Kernel V2.3 - ??? Int 61 Fn 5C U - Pc/tcp Kernel V2.3 - ??? Int 61 Fn 5D U - Pc/tcp Kernel V2.3 - ??? Int 61 Fn 5E U - Pc/tcp Kernel V2.3 - ??? Int 61 Fn 5F U - Pc/tcp Kernel V2.3 - ???