ff3:ff3us:patches:madsiur:sram

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ff3:ff3us:patches:madsiur:sram [2018/05/25 06:49]
madsiur [Description] 		ff3:ff3us:patches:madsiur:sram [2019/02/12 11:45] (current)
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 ==== Patch data ==== ==== Patch data ====
  
-|Name               |SRAM Expansion 1.0 |+|Name               |SRAM Expansion 1.1 |
 |Author             |madsiur  | |Author             |madsiur  |
 |Link               |{{ff3:ff3us:patches:madsiur:sram.zip|Download}}  | |Link               |{{ff3:ff3us:patches:madsiur:sram.zip|Download}}  |
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                    $337F00 = last altered savefile                    $337F00 = last altered savefile
                    $337F01 = rng index                    $337F01 = rng index
-                   $337F08 = fixed value #$E41B (slot 1) +                   $337F08 = checksum value #$E41B (slot 1) 
-                   $337F0A = fixed value #$E41B (slot 2) +                   $337F0A = checksum value #$E41B (slot 2) 
-                   $337F0C = fixed value #$E41B (slot 3) +                   $337F0C = checksum value #$E41B (slot 3) 
-                   $337F0E = fixed value #$E41B (slot 4, useless..)+                   $337F0E = checksum value #$E41B (slot 4, useless..)
 </code> </code>
  
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 This hack expand SRAM by $1600 bytes for each save slot, allowing now 8Kb bytes for each save slot plus a third 8Kb for general purpose for a total of 32Kb of SRAM. 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.\\ This hack expand SRAM by $1600 bytes for each save slot, allowing now 8Kb bytes for each save slot plus a third 8Kb for general purpose for a total of 32Kb of SRAM. 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. 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 as an example STA $336000,X or LDA $336000,X.\\+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. 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 and $7E1600-$7E1FFF. So in order to save or load from extra SRAM in your hack, use as an example STA $336000,X or LDA $336000,X.\\
  
 Since $337600-$337EFF is not used, it means it could be use as scratchpad SRAM for temporary things or have a general use common to the three slots. $337FF0-$337FFF has same function as the original $307FF0-$307FFF.\\ Since $337600-$337EFF is not used, it means it could be use as scratchpad SRAM for temporary things or have a general use common to the three slots. $337FF0-$337FFF has same function as the original $307FF0-$307FFF.\\
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 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.\\ 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.\\+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, you will need a HiROM cart with a 32Kb memory chip. I have no idea if any existing SNES game has already 32Kb of SRAM.\\
  
 ==== Links ==== ==== Links ====
  
 [[http://www.ff6hacking.com/forums/showthread.php?tid=3694|Forum Thread]]\\ [[http://www.ff6hacking.com/forums/showthread.php?tid=3694|Forum Thread]]\\
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