Final Fantasy III: Holy Randomness Batman!

This patch replaces the old random number generator (RNG) with a newer one. The old one was a lookup table of 255 values which were “randomly” loaded. The new one adapts a constantly-tweaked frame counter in with the lookup table.

Title: Holy Randomness Batman!
Author: Lenophis
Version: v1.6
Applies to: FF3us v1.0
Tested on: FF3us v1.0

Contents: Tweak - Holy Randomness Batman! - No header.ips
Tweak - Holy Randomness Batman! - header.ips
Anti random - header.ips
Anti random - no header.ips
readme.txt
random - New C0.txt
random - New C1.txt
random - New C2.txt
random - New C3.txt

ROM addresses: C0/0636 - C0/0639*
C0/4012 - C0/4015**
C0/6879 - C0/687B*
C0/C48C - C0/C48F**
C0/C4A9 - C0/C4AC**
C0/BB32 - C0/BB35*
C0/C17A - C0/C17C*
C0/C331 - C0/C334*
C0/C48C - C0/C48F**
C0/C4A9 - C0/C4AC**
C0/D6B0 - C0/D705
C1/1861 - C1/1864**
C1/CD53 - C1/CD56**
C1/CECF - C1/CED2**
C2/4B5F - C2/4B62**
C2/4B6F - C2/4B72**
C2/BBEC - C2/BBEF**
C2/BC9B - C2/BC9E**
C3/A445 - C3/A448*
C3/F0FC - C3/F16B
EE/149D - EE/14A0**
EE/150D - EE/1510**
EE/2515 - EE/2718**
EE/2523 - EE/2527**
EE/3281 - EE/3284**
EE/32CF - EE/32D2**
EE/5071 - EE/5074**
EE/5081 - EE/5084**
EE/5092 - EE/5096**
EE/54C6 - EE/54C9**
EE/54D6 - EE/54D9**
EE/54E7 - EE/54EA**
EE/56BF - EE/56C2**
EE/56CF - EE/56D2**
EE/56E0 - EE/56E3**
EE/86A6 - EE/86A9**
EE/86B4 - EE/86B7**

*: I replaced a 3-byte instruction with JSR $xxxx to increment the frame counter
then did the instruction I had delayed.

**: These are LDA $C0FD00,X calls that were replaced with JSL $C0D6B0 calls.

Urgency: Medium to annoyingly high
It depends on if you really believe that FF6 uses a random number generator. ;)

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Description:

Final Fantasy 6 uses a table of 256 values that it "randomly" loads from, which
then returns the psuedo-random-but-predictable-number.

--------------------------------------------------------------------------------
What this patch does:

Eliminates the old random number generator, of course. It is replaced with
something that I at least hope is better in the long run.

Note: The anti patches will remove the patch.

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Version history:

v1.6a - October 30, 2008
I've righted a wrong, and finally added BMF54123 to the credits section.
No changes made to patch.

v1.6 - January 18, 2008
Removed the two last calls in bank C1, as they were causing massive
spell animation slowdown. Added a ton of calls in bank EE.

v1.5 - There were more LDA $C0FD00,X calls than I thought.
WARNING: This patch is no longer compatible with v1.1 of the rom!
The code at C1/CD53 and C1/CECF has been shifted left three bytes. So,
v1.6 of this patch will include a patch for v1.1 :)

v1.0a - Minor changes made in readme and in Random - new C3.txt
While the branches were correct, where the text file said they were
going was not correct.
No changes made to patch.

v1.0 - Initial release

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Credits:

Imzogelmo - For writing the C0, C1, and C3 disassemblies. He also pointed out
that I had missed a few LDA's.
Terii Senshi & assassin - For writing the C2 bank disassembly.
assassin - Double notice for looking at my code and making sure that I can
indeed program with this insane assembly. :P
BMF54123 - For originally helping me with the idea.


Final Fantasy III (USA).sfc - NOINTRO
CRC32: A27F1C7A
MD5: E986575B98300F721CE27C180264D890
SHA-1: 4F37E4274AC3B2EA1BEDB08AA149D8FC5BB676E7
SHA-256: 0F51B4FCA41B7FD509E4B8F9D543151F68EFA5E97B08493E4B2A0C06F5D8D5E2