Nintendo DMG-01 - Game Boy Console Manual page 16

2.6. Cartridge Types
It is similar to the MBC3 (but no RTC) but can
access up to 64mbits of ROM and up to 1mbit of RAM.
The lower 8 bits of the 9-bit rom bank select is
written to the 2000-2FFF area while the upper bit
is written to the least significant bit of the
3000-3FFF area.
Writing a value (XXXXBBBB - X = Don't care, B =
bank select bits) into 4000-5FFF area will select
an appropriate RAM bank at A000-BFFF if the cart
contains RAM. Ram sizes are 64kbit,256kbit, &
1mbit.
Also, this is the first MBC that allows rom bank 0
to appear in the 4000-7FFF range by writing $000
to the rom bank select.
Rumble Carts:
•
Rumble carts use an MBC5 memory bank controller.
Rumble carts can only have up to 256kbits of RAM.
The highest RAM address line that allows 1mbit of
RAM on MBC5 non-rumble carts is used as the motor
on/off for the rumble cart.
Writing a value (XXXXMBBB - X = Don't care, M =
motor, B = bank select bits) into 4000-5FFF area
will select an appropriate RAM bank at A000-BFFF
if the cart contains RAM. RAM sizes are 64kbit or
256kbits. To turn the rumble motor on set M = 1,
M = 0 turns it off.
HuC1 (Memory Bank / Infrared Controller):
•
This controller made by Hudson Soft appears to be
very similar to an MBC1 with the main difference
being that it supports infrared LED input / output.
The Japanese cart "Fighting Phoenix" (internal cart
name: SUPER B DAMAN) is known to contain this chip.
Page 16
TM
Game Boy CPU Manual
V 1.01