Jet Set Willy: Unused RAM at 38644

| Unused

38644: Unused routine

This routine copies the attribute bytes for an empty room to the screen, so perhaps it was used during development of the game to check that the layout of a room had been defined correctly.
38644 | LD HL,24064 | Copy the attribute buffer at 24064 to the top two-thirds of the screen
38647 | LD DE,22528
38650 | LD BC,512
38653 | LDIR
38655 | LD HL,16384 | Fill the top two-thirds of the display file with the byte value 24 (00011000)
38658 | LD DE,16385
38661 | LD BC,4095
38664 | LD (HL),24
38666 | LDIR
38668 | LD BC,65278 | Prepare BC for reading keys SHIFT-Z-X-C-V
38671 | IN A,(C) | Read these keys
38673 | BIT 2,A | Is 'X' being pressed?
38675 | JP Z,0 | Jump if so to reset the machine
38678 | JR 38671 | Otherwise jump back to read the keyboard again