User:Blaziken257/Telefang RNG

In Telefang 1, random events rely on a random number generator. It is generated using the following variables:

• The frame counter, located at 0x3C30 in RAM. This is an 8-bit number, and it increments by 1 for every frame that passes (1 frame = 1/60 second). However, it temporarily freezes in certain situations, mainly when the game has to load screens. The frame counter makes random actions frame dependent.
• Seed 1, located at 0xC41F in RAM. This value is also an 8-bit number, and it changes every time a random event occurs, and its value depends on the current value of the frame counter, as well as the current values of both seeds.
• Seed 2, located at 0xC420 in RAM. This 8-bit value functions similarly to Seed 1, although it influences the randomly generated number more than Seed 1.
• Seed sum, the 8-bit sum of the two seeds, located at 0xC400 in RAM. This is the randomly generated number, most directly used to determine random events.

Seed calculation

Note: Original thread here: http://s15.zetaboards.com/Tulunk_Village/topic/6967791/1/

First, the game takes the current value of the frame counter and uses a formula to calculate a new 16-bit number, which is later added to the seeds.

F = (Frame counter * 256) + ((int(((Swap nibbles(Frame counter) + 1) mod 256) / 2) + 135) mod 256)

Next, the game calculates a number based on the current value of the two seeds. This formula is simpler:

S = Seed 1 * 256 + Seed 2

To obtain seed 1:

Seed 1_new = ((F+S) mod 256)

To obtain seed 2:

Seed 2_new = (int(((F+S) mod 65536)/256)) xor ((F+S) mod 256)

The seeds are then added together (reduced to 8 bits), and this is the randomly generated number.

Random events

Wild Denjuu

Species

For more information, see one of these pages.

Random number range	Probability	Denjuu Group
0-24	10%	Denjuu 4
25-75	20%	Denjuu 3
76-152	30%	Denjuu 2
153-255	40%	Denjuu 1

Level

Random number range	Probability	Level offset
0-63	25%	+1
64-127	25%	-1
128-255	50%	0

Personality

Random number range	Probability	Personality
0-19, 240-255*	14%	0
20-39	8%	1
40-59	8%	2
60-79	8%	3
80-99	8%	4
100-119	8%	5
120-139	8%	6
140-159	8%	7
160-179	8%	8
180-199	8%	9
200-219	8%	10
220-239	8%	11

Battle events

Escaping

More research needed!

When 0xD504 <= 0xD546 (note: these addresses' behavior are unknown, although both seem to always be 0 before battling):

Random number range	Probability	Level offset
0-199	78%	Unable to escape
200-255	22%	Able to escape

When 0xD504 > 0xD546 (note: these addresses' behavior are unknown, although both seem to always be 0 before battling):

Random number range	Probability	Level offset
0-84	33%	Unable to escape
85-255	67%	Able to escape