PAT file: Difference between revisions
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*Patch address (in bytes, all the $0000~$FFFF range seems to work) | *Patch address (in bytes, all the $0000~$FFFF range seems to work) | ||
*First data word is (/2), byteswapped and written to address | *First data word is (/2), byteswapped and written to address | ||
*Second data word is (/2)-1, byteswapped written to address+2 | *Second data word is (/2)-1, byteswapped written to address+2 | ||
*Third (optional) data word is (/2), byteswapped and written to address+4 | *Third (optional) data word is (/2), byteswapped and written to address+4 | ||
*Fourth (optional) data word is (/2)-1, byteswapped written to address+6 | *Fourth (optional) data word is (/2)-1, byteswapped written to address+6 | ||
If third data word is 0x0000 both the third and forth patches are skipped. | If third data word is 0x0000 both the third and forth patches are skipped. | ||
[[Category:CD systems]] | [[Category:CD systems]] | ||
Revision as of 09:06, 4 November 2012
PAT files contain structured data to patch already loaded Z80 code. They're used to replace sound samples addresses originally loaded from Z80 files when different PCM files are used.
- Maximum file size: ?
- Type code: 5
- Loadable in: Z80 RAM
- Banks: 1
Format
Blocks of 5, 16bit values:
- Patch address (in bytes, all the $0000~$FFFF range seems to work)
- First data word is (/2), byteswapped and written to address
- Second data word is (/2)-1, byteswapped written to address+2
- Third (optional) data word is (/2), byteswapped and written to address+4
- Fourth (optional) data word is (/2)-1, byteswapped written to address+6
If third data word is 0x0000 both the third and forth patches are skipped.