Difference between revisions of "LVGM"
From MSX Game Library
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Revision as of 23:36, 15 December 2023
============================================================================== HEADER (4 bytes) ============================================================================== nn nn "LVGM" Light-VGM identifier nn Options 7 6 5 4 3 2 1 0 │ │ │ │ │ └── Frequency (0: 60 Hz, 1: 50 Hz) │ │ │ │ └──── Loop data included └─┴─┴─┴────────── File format version (0) nn Devices 7 6 5 4 3 2 1 0 │ │ │ │ │ │ └── Include PSG data (AY-3-8910) │ │ │ │ │ └──── Include MSX-MUSIC data (YM2413/OPLL) │ │ │ │ └────── Include MSX-AUDIO data (Y8950/OPL1+ADPCM) │ │ │ └──────── Include SCC data (K051649) │ │ └────────── Include SCC+ data (K052539) │ └──────────── Include secondary PSG data └──────────────── Include Moonsound data (YMF278/OPL4) ============================================================================== COMMON DATA (D0~FF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ Dn Wait n+1 cycles (1~16) .............................................................................. En rr vv[] Copy n+3 bytes (3~18) from register #rr .............................................................................. F0 Start of PSG chunk (default when not defined) F1 Start of MSX-MUSIC chunk F2 Start of MSX-AUDIO chunk F3 Start of SCC chunk F4 Start of SCC+ chunk F5 Start of secondary PSG chunk F7 Start of Moonsound chunk FD nn rr vv[] Copy nn bytes (0~255) from register #rr FE nn nn End of song with loop FF End of song (without loop) .............................................................................. Not used: F6, F8~FC ============================================================================== PSG DATA (00~CF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ Tone Period ------------------------------------------------------------------------------ 00 nn R#0 = nn 1n R#1 = n 02 nn R#2 = nn 2n R#3 = n 04 nn R#4 = nn 3n R#5 = n ------------------------------------------------------------------------------ Noise Period ------------------------------------------------------------------------------ 4n R#6 = n 5n R#6 = n | 0x10 ------------------------------------------------------------------------------ Mixer ------------------------------------------------------------------------------ 07 nn R#7 = nn ------------------------------------------------------------------------------ Tone Amplitude ------------------------------------------------------------------------------ 6n R#8 = n 7n R#8 = n | 0x10 8n R#9 = n 9n R#9 = n | 0x10 An R#A = n Bn R#A = n | 0x10 ------------------------------------------------------------------------------ Envelope Period ------------------------------------------------------------------------------ 0B nn R#11 = nn 0C nn R#12 = nn ------------------------------------------------------------------------------ Envelope Shape ------------------------------------------------------------------------------ Cn R#13 = n .............................................................................. Not used: 01, 03, 05, 06, 08, 09, 0A, 0D~0F ============================================================================== MSX-MUSIC DATA (00~CF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ rr nn Register #rr (00~38) set to nn 40 nn[8] User Tone (copy 8 bytes from R#0) 50 nn[9] F-Number (copy 9 bytes from R#10) 60 nn[9] Setting (copy 9 bytes from R#20) 70 nn[9] Inst/col (copy 9 bytes from R#30) .............................................................................. Not used: 08~0D, 19~1F, 29~2F, 39~3F, 41~4F, 51~5F, 61~6F, 71~CF ============================================================================== MSX-AUDIO DATA (00~CF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ rr nn Register #rr (00~C8) set to nn 1F nn[8] User Tone 1 (copy 8 bytes in 20,23,40,43,60,63,80,83) 2F nn[8] User Tone 2 (copy 8 bytes in 21,24,41,44,61,64,81,84) 3F nn[8] User Tone 3 (copy 8 bytes in 22,25,42,45,62,65,82,85) 4F nn[8] User Tone 4 (copy 8 bytes in 28,2B,48,4B,68,6B,88,8B) 5F nn[8] User Tone 5 (copy 8 bytes in 29,2C,49,4C,69,6C,89,8C) 6F nn[8] User Tone 6 (copy 8 bytes in 2A,2D,4A,4D,6A,6D,8A,8D) 7F nn[8] User Tone 7 (copy 8 bytes in 30,33,50,53,70,73,90,93) 8F nn[8] User Tone 8 (copy 8 bytes in 31,34,51,54,71,74,91,94) 9F nn[8] User Tone 9 (copy 8 bytes in 32,35,52,55,72,75,92,95) .............................................................................. Not used: 13~14, 1B~1E, 26~27, 2E, 36~3E, 46~47, 4E, 56~5E, 66~67, 6E, 76~7E, 86~87, 8E, 96~9E, A9~AF, B9~BC, BE~BF, C9~CF ============================================================================== SCC/SCC+ DATA (00~CF) ============================================================================== Opcode Action ------------------------------------------------------------------------------ rr nn Register #rr (00h~C0h) set to nn 90 nn[32] Copy 32 bytes to channel 1 waveform (9800h) 92 nn[32] Copy 32 bytes to channel 2 waveform (9820h) 94 nn[32] Copy 32 bytes to channel 3 waveform (9840h) 96 nn[32] Copy 32 bytes to channel 4 waveform (9860h) 98 nn[32] Copy 32 bytes to channel 5 waveform (98A0h) (SCC+ only) .............................................................................. Not used: 91, 93, 95, 97, 99~9F, C1~CF