Memory addresses less than 0x100 tend to be used for temporary or scratch calculations.

Each of 0x04E0-0x04E6 are bitfields which represent current Story Progress.

Sprite data is stored in more or less the same sort of structure between Nasir and NPCs and Enemies and so on. It's a 0x40 length record.

Only some key items listed, work in progress.

Resistances are listed in the form of 4 numbers, 0-F, which is a bitmask that determines which spells effect the enemy. Level 1 spells check the first bit, level 2 check the second and so on. So if an enemy has a 0, then no spells affect it, if the enemy has an F then all spells affect it, E then spells Level 2 or higher affect it, C level 3 or higher. The order is given by Lightning, Water, Wind, Fire. So FC0E is fully vulnerable to jLightning and will take damage from level 2 or better Fire spells, vulnerable to level 3 or better Water Spells, and completely immune from Wind spells.

Room Sprite Data is located at ROM address 0x859552, in a packed array of 0xFFFF terminated lists. Each entry is formatted as this structure

It is referenced by a mostly unexplored Room Metadata struct, that has the 24-bit pointer at offset 0x2B. Room Metadata is stored in the ROM at 0x85B2DF, and each entry is 0x38 bytes long.

Nasir's attempted movement direction gets mixed in with the RNG at 0x81814B by simply adding it to 0x03B5, giving the player a way of controlling the RNG a little bit. However, these numbers are rather small (-1, 0, 1, 2, 3), additionally, because Manhattan geometry, there are several different equivalent paths to go to a specific point; however, they will all add the same amount overall. The ways to change this are via an delay, and via cutting a corner more or less.

Every time an RNG value is needed 0x809848 ("GetNextRNG") is called.

This function does roughly the following:

acc = $3B5 + 1; $3B4 = acc; $3B5 = 5 * acc; $3B4 = $3B5 * 16 | $3B5 / 16; // nibble swap return $3B4;