Data elements are stored low byte first (little-endian). All integer fields are
unsigned.
ISX File
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Type Field Note
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Header Header May not be present: check for Identifier
Record[] Records ISX file records
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Header (32 bytes)
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Type Field Note
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u24 Identifier 0x585349 ("ISX" in ASCII)
u8[29] Memo Arbitrary? Contains version/author text in ASCII
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Record
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Type Field Note
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u8 Type Record type:
0x01: Code (SNES)
0x03: Range (SNES)
0x04: Symbol (SNES)
0x11: Code (Virtual Boy)
0x13: Range (Virtual Boy)
0x14: Symbol (Virtual Boy)
0x20: System (undocumented)
0x21: System (undocumented)
0x22: System (undocumented)
u8[*] Fields Format depends on Type
===============================================================================
Record.0x01 - Code (SNES)
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Type Field Note
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u8 Type 0x01
u8 Bank Cartridge bank number
u8 BankHigh Only present if Bank >= 0x80
u16 Address CPU bus address
u16 DataLength Number of bytes in Data
u8[*] Data Actual code bytes
===============================================================================
Record.0x03 - Range (SNES)
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Type Field Note
-------------------------------------------------------------------------------
u8 Type 0x03
u16 Count Number of ranges
Range[*] Ranges Count elements
u8 Bank Cartridge bank number
u16 StartAddress Lowest CPU bus address
u16 EndAddress Highest CPU bus address
u8 RangeType See: Range Types
===============================================================================
Record.0x04 - Symbol (SNES)
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Type Field Note
-------------------------------------------------------------------------------
u8 Type 0x04
u16 Count Number of symbols
Symbol[*] Symbols Count elements
u8 NameLength Number of bytes in Name
u8[*] Name Symbol name
u8 Flags Undocumented
u8 Bank Cartridge bank number
u16 Address CPU bus address
===============================================================================
Record.0x11 - Code (Virtual Boy)
===============================================================================
Type Field Note
-------------------------------------------------------------------------------
u8 Type 0x11
u32 Address CPU bus address
u32 DataLength Number of bytes in Data
u8[*] Data Actual code bytes
===============================================================================
Record.0x13 - Range (Virtual Boy)
===============================================================================
Type Field Note
-------------------------------------------------------------------------------
u8 Type 0x13
u16 Count Number of ranges
Range[*] Ranges Count elements
u32 StartAddress Lowest CPU bus address
u32 EndAddress Highest CPU bus address
u8 RangeType See: Range Types
===============================================================================
Record.0x14 - Symbol (Virtual Boy)
===============================================================================
Type Field Note
-------------------------------------------------------------------------------
u8 Type 0x14
u16 Count Number of symbols
Symbol[*] Symbols Count elements
u8 NameLength Number of bytes in Name
u8[*] Name Symbol name
u16 Flags Undocumented
u32 Address CPU bus address
===============================================================================
Record.0x20, 0x21, 0x22 - System
===============================================================================
Type Field Note
-------------------------------------------------------------------------------
u8 Type 0x20, 0x21 or 0x22
u32 DataLength Number of bytes in Data
u8[*] Data Debug data bytes
===============================================================================
Range Types
-----------
0x41 ('A') 8-bit integer (.db), string
0x42 ('B') 8-bit integer (.db), numeric
0x43 ('C') Compiled C code
0x44 ('D') 16-bit integer (.dd, high byte first)
0x45 ('E') 65C816 code (8-bit accumulator, 8-bit index)
0x46 ('F') 65C816 code (8-bit accumulator, 16-bit index)
0x47 ('G') 65C816 code (16-bit accumulator, 8-bit index)
0x48 ('H') 65C816 code (16-bit accumulator, 16-bit index)
0x4C ('L') 32-bit integer (.dl SNES, .dw Virtual Boy, low byte first)
0x53 ('S') Size reservation, as in .bss allocation (.ds)
0x57 ('W') 16-bit integer (.dw SNES, .dh Virtual Boy, low byte first)