Nintendo 1504166 - Game Boy Advance SP Edition Console Programming Manual page 171

AGB Programming Manual
Device Type
Store the type of device that is installed in the Game Pak. If there is a 1
Mbit flash DACS (Debugging And Communication System) (=custom
1Mbit flash Memory with security and patch functions) in a Game Pak, set
the most significant bit to 1. Otherwise it is reset. Other bits are system
allocated area.
Mask ROM Version No.
Store the ROM version number here.
Complement Check
The 2's complement of the total of the data stored in address 80000A0h ~
80000BCh plus 19h is stored in this location.
Reserved Area
This is a system allocated area. Set this area to 00h.
©1999 - 2001 Nintendo of America Inc.
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ROM Registration Data
D.C.N. AGB-06-0001-002B4