Brother HL 1240 - B/W Laser Printer Service Manual page 46

CHAPTER 3 THEORY OF OPERATION
1.3.2 ROM
HL-1240
An 8 Mbits ROM (x 16 bit) is mounted into this socket.
HL-1250
Two 16 Mbits ROMs (x 16 bit) are mounted into these sockets.
Fig. 3-7
Fig. 3-8
3-8