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hacking_faq [2018/03/21 11:03] madsiur [FAQ] |
hacking_faq [2018/03/21 11:04] madsiur [FAQ] |
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| - | === What is an offset | + | === What is an offset, ROM address and SNES address ? === |
| - | Both terms are equivalent. One can refer to a ROM address by the term offset, it is the address you see in the hex editor. However a SNES address is different. The two more common ways the ROM cartridge are mapped to memory are called LoROM and HiROM. In the case of a FF6 cartridge we have a **HiROM + FastROM** ROM type. In a HiROM mapping occupies banks $40-$7D and $C0-$FF and HiROM games commonly access the ROM at banks $C0-$FF exclusively. In the case of FF6, since the ROM size is 24Mbit, the possible addresses are in the range of $C00000-$EFFFFF. This mean address or offset $000000 in a hex editor is SNES address $C00000, $100000 is $D00000, etc. If you expand the ROM too 32Mbit, you add addresses $F00000-$FFFFFF. It is possible to expand beyond this point but then the address following $FFFFFF will be $400000, matching what is in the hex editor (see below question). If you want to know more details about SNES memory mapping, there are documents available on this {{ff3: | + | Both terms are equivalent. One can refer to a ROM address by the term offset, it is the address you see in the hex editor. However a SNES address is different. The two more common ways the ROM cartridge are mapped to memory are called LoROM and HiROM. In the case of a FF6 cartridge we have a **HiROM + FastROM** ROM type. In a HiROM mapping occupies banks $40-$7D and $C0-$FF and HiROM games commonly access the ROM at banks $C0-$FF exclusively. In the case of FF6, since the ROM size is 24Mbit, the possible addresses are in the range of $C00000-$EFFFFF. This mean address or offset $000000 in a hex editor is SNES address $C00000, $100000 is $D00000, etc. If you expand the ROM too 32Mbit, you add addresses $F00000-$FFFFFF. It is possible to expand beyond this point but then the address following $FFFFFF will be $400000, matching what is in the hex editor (see below question). If you want to know more details about SNES memory mapping, there are documents available on this [[ff3: |
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