Final Fantasy III: FF3us SRAM Expansion is a ROM hack for the Super Nintendo that increases SRAM capacity from 8KB to 32KB by expanding each save slot to 8KB and adding an additional 8KB for general use. Released by madsiur on June 25, 2024, this patch modifies save functionality and optimizes memory management, enhancing gameplay by providing more storage for saved progress.
This hack expand SRAM by $1600 bytes for each save slot, allowing now 8Kb for each
save slot plus a 4th 8Kb for general purpose, for a total of 32Kb of SRAM instead of 8Kb. (see readme for all info).
FF3us SRAM Expansion
by madsiur
version 2.0
released on 06/25/2024
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Files included
sram_nh.ips: patch for FF3us 1.0 headerless ROM.
sram_nh_reverse.ips: reverse patch.
sram.asm: Assembly file to assemble with bass.
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Offset changed, free space used (by patch)
$C0FFD8: Internal header SRAM size (from $03 to $05)
Bank $C3: A few offsets related to saving and loading (see asm file)
$C3F091: $92 bytes of free space
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New SRAM map
Other SRAM values: $336000-$3375FF (game common SRAM)
$337600-$337EFF (unused)
$337F00 = last altered savefile
$337F01 = rng index
$337F08 = checksum value #$E41B (slot 1)
$337F0A = checksum value #$E41B (slot 2)
$337F0C = checksum value #$E41B (slot 3)
$337F0E = checksum value #$E41B (slot 4)
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Description
This hack expands SRAM by $1600 bytes, allowing now $2000 bytes for each
save slot plus a third 8Kb for general purpose. In original game, only 8Kb of
SRAM is used ($306000-$307FFF), each slot occupying $0A00 bytes and $200 bytes
for general purpose at the end of the 8Kb block.
With this hack, $306000-$307FFF is used for slot 1, $316000-$317FFF for slot 2
and $326000-$327FFF for slot 3. $336000-$337FFF is used for game SRAM as well.
When you play the game, $7E1600-$7E1FFF is still used and copied to
correct slot at saving. $336000-$3375FF is copied to correct slot as
extra SRAM. At game loading, correct slot is loaded into $336000-$3375FF.
So in order to save or load from extra SRAM in your hack, use for example
STA $336000,X or LDA $336000,X.
Since $337600-$337EFF is not used, it means it could be used as scratchpad RAM
for temporary things or have a general use common to the three slots.
SRAM could be expanded more but I figured a whole $2000 bytes instead of $0A00
is enough expansion for any hack. In HiROM mapping banks $20-$3F can be used
to map SRAM, using always the $6000-$7FFF range of the bank. $C0FFD8 tell the
emulator the SRAM size of the ROM.
I have not tested this on sd2snes, Everdrive or real hardware. snes9x 1.55 and
bsnes+ were used for testing. If you plan to use this hack and make a cart of
your hack after, I have no idea what kind of cartridge you will need or if
32Kb of SRAM is supported by any existing SNES game.
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Version history
06/24/2024 2.0 release
-fixed hack breaking bug where extra SRAM for slots 1 and 2 would not be loaded in $336000 at game loading
-changed most of saving/loading code to use less free space
10/04/2018 1.1 release
-removed $336000 init (see sram.asm for details)
-renamed $337F08-$337F0E from "fixed value" to "checksum value"
05/25/2018 1.0 initial released
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Alternate downloads
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