Changes
Below "Hidden" RSX commands are having non-ASCII names, so they cannot be used under BASIC by typing |NAME. Instead, they can be used only in machine code, by obtaining the function address via KL_FIND_COMMAND, for detals ses: [[BIOS Kernel RSX Functions (Resident System Extensions)]]
== Message On/Off ==
chr(81h) MESSAGE_ON_OFF ;in: A=flag(00h=on, >=01h=off) (R,I,C);out:A=old
