Difference between revisions of "SCUMM/NES"

SCUMM/NES (view source)

Revision as of 07:15, 6 April 2005

690 bytes added , 07:15, 6 April 2005

→‎Sound

Quietust

30

edits

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   [03/07/0B/0F] - next 4 bytes is data for sound channel 0/1/2/3 (square1, square2, triangle, noise)
   [10] - next byte is a number of frames to wait before processing the next update
+ [FE] - loop back to beginning
   [FF] - terminate sound
- [FE] - loop back to beginning
   Type 100 data:
-  uint8 auxLen - specifies length of some sort of auxiliary data
+  uint8 auxLen - specifies length of auxiliary data blocks
-  uint8 auxdata1[auxLen] - a long sequence of small numbers, slowly incrementing
+  uint8 noteInstrs[auxLen] - Specifies the instrument of each predefined note
-  uint8 auxdata2[auxLen] - another sequence of numbers ranging from 00-3F
+  uint8 noteFreqs[auxLen] - Specifies the pitch of each predefined note
-  uint8 unknown[] - haven't decoded yet
+ uint8 music[]:
+thru (auxLen-1) - start playing a note using the specified instrument at the specified pitch
+ auxLen thru (auxLen+15) - update the note playing in the specified instrument (?)
+ (auxLen+16) thru 0xFF - delay N-auxLen-16 frames before parsing next byte
+  [FE] - loop back to beginning
   [FF] - terminate sound
-  [FE] - loop back to beginning
+  There are a total of 16 instruments, spread out over the 4 NES sound channels using the following mapping:
+ A total of 28 commands exist within the sound engine, each tied to one or more instruments.
+ Sound channels: (00 = square A, 01 = square B, 02 = triangle, 03 = noise)
+ * 00 00 00 00 00 00 00 01 01 01 02 02 01 03 03 03
+ Start commands:
+ * 05 03 06 08 0B 01 01 1A 16 06 04 17 02 10 0E 0D
+ Update (?) commands:
+ * 0F 00 00 09 00 14 15 00 00 00 1B 1B 0F 0F 0F 0F