General

Compressed Char Loading starts at FFF85866 -> r6 contains charset address in file, r24 the charset address in memory (bgmap offset)
Compressed Char Loading starts at FFF858EA -> r6 contains charset address in file of end (end - start - 2 == length)
General BGMap loading starts at FFF80AC2 -> r7 contains bgmap adress, r9 * r8 * 2 == length, r8 = chars per rwo

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Precaution Screen

First letter in 
CHAR Address: 00017010 (mirror 0007D010)
BGMAP Address: 0003650C

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Letter in CHAR is written at FFF806D8
Letter CHAR Data is loaded from FFFAB70C

Precaution screen CHARSET starts at FFFAB6FC (File address 2B6FC) in ROM (length 0x86 * 16)

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Letter in BGMAP is written at FFF80ACE
Letter BGMAP Data is loaded from FFFAC038

Precaution screen BGMAP starts at FFFABF6C (File address 2BF6C) in ROM (length 0x30*2 per row as stored in r25)

2BF6C -> Precaution screen bg map

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Auto Pause Selection

First char in 
CHAR Address: 00017010 (mirror 0007D010)
BGMAP Address: 00036000 (36098 first asset)

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Char is written at FFF8594C (generic char loading)
Char is loaded from memory at FFF85928 -> Memory Address: 5012198 (writes to 105002198)
Memory is written at FFF8590C with value from r25
Loads value into r25 at FFF85902 from address FFFAC573 (File Address 2C573 -> 2C572) 

(Crazy compression loading)

CharData starts at FFFAC56C (File address 2C56C) in ROM
-> First byte is length (Number of 16 byte steps I think) (90)
-> Second byte is empty (91)
-> Next 4 bytes are Alt byte masks (92-95)
-> Next byte is alt byte  (96)

Data compression stores even and uneven bits of a short in 2 bytes.
Alt mask identify bitwise if altbyte or regular data is used.

2C56C -> Auto pause selection charset
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Corner in BgMap is written at FFF80ACE
Corner in BgMap is laoded from FFFACE0C

Auto Pause Selection starts at FFFACD94 (File Address 2CD94) in ROM  (length 0x30*2 per row as stored in r25)

2CD94 -> Auto Pause selection map

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Challange screen:

CHAR Start: FFFA05B6 -> 205B6 -> 205B8
CHAR END: FFFA0A17
CHAR MEM POS: 7A010

BGMAP Address: FFFA0A18 -> 20A18
length = 1C * A * 2
cpr = 1C

BGMAP Address: FFFA0A18 -> 20C48
length = 1C * A * 2
cpr = 1C

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Auto Pause

5002127  -> set to one while playing regular -> die and auto pause comes up

CHAR Start: FFFA0E78 -> 20E78 -> 2 0E7A
CHAR END: FFFA2370
CHAR MEM POS: 7B010

BGMAP Address: FFFA2370 -> 22370
length = 30 * 1C  * 2
cpr = 30