Jet Set Willy: Unused RAM at 96F4

| Unused

96F4: 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.
96F4 | LD HL,$5E00 | Copy the attribute buffer at 5E00 to the top two-thirds of the screen
96F7 | LD DE,$5800
96FA | LD BC,$0200
96FD | LDIR
96FF | LD HL,$4000 | Fill the top two-thirds of the display file with the byte value 0x18 (00011000)
9702 | LD DE,$4001
9705 | LD BC,$0FFF
9708 | LD (HL),$18
970A | LDIR
970C | LD BC,$FEFE | Prepare BC for reading keys SHIFT-Z-X-C-V
970F | IN A,(C) | Read these keys
9711 | BIT 2,A | Is 'X' being pressed?
9713 | JP Z,$0000 | Jump if so to reset the machine
9716 | JR $970F | Otherwise jump back to read the keyboard again