Nintendo GAME BOY Programming Manual page 299

9. ROM Size (0148H)
Store the code for the program ROM size from the table below.
10. External RAM Size (0149H)
Store the code for the size of external RAM installed in the Game Pak.
11. Destination Code (014AH)
Store the code from the table below which indicates where the product will be marketed.
12. Mask ROM Version N0. (014CH)
The mask ROM version number starts from 00 and increases by 1 for each revised
version sent after starting production.
Appendix 3: Software Submission Requirements
0148H ROM Size
00H 256 KBit
01H 512 KBit
02H
03H
04H
05H
06H 16 MBit
07H 32 Mbit
08H 64 Mbit
Address 149 RAM Size
00H No RAM or MBC2
01H
02H 64 KBit
03H 256 KBit
04H
Address 147 Destination
00H
01H All Others
299
1 MBit
2 MBit
4 MBit
8 MBit
-------
1 Mbit
Japan