Pokes
Infinite Energy
POKE DD75,BE
This alters the line.
DD74 DEC (IY+0C)
To be a "ComPare" command, so energy is no longer depleted.
DD74 CP (IY+0C)
Also seen this documented as:
POKE DD73,00
POKE DD74,00
POKE DD75,00
Which just removes the command.
Stops Annoying Telecast Beeps
POKE FDDC,00
This alters the line.
FDDB DJNZ FDC6
To point to itself (so you only hear a single "BEEP").
FDDB DJNZ FDDB