ZX SPECTRUM SOUND CHIP EMULATOR FILES AYM
AYM The AYM format stores same music as AY-format. Original description of format describes CPC and ZX AY ports emulation only. But AY Emulator additionally is emulating ZX beeper port. Before AY_Emul, AYM format was supporting only by one program is RDOSPLAY (OPL2/OPL3 chip music player).
Roman Dolejsi (roman@sorry.vse.cz) designed the AYM format. Next is slightly edited text from RDOSPLAY.TXT.
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name size pos info 'AYM0' dword 00 identifier (AY Music, format revision 0) name db 28 04 music name author db 16 20 music author name init word 30 music init entry (A = music number) play word 32 interrupt player entry musmin byte 34 min music number musmax byte 35 max music number (musmax - musmin = number of musics) muspos byte 36 starting music number regpos byte 37 reg in which musnum is stored when entering init (00-0B) AFreg word 38 AF register before entering init routine BCreg word 3A BC register DEreg word 3C DE register HLreg word 3E HL register IXreg word 40 IX register IYreg word 42 IY register blocks byte 44 number of memory blocks
from pos 45h, rest of the file contains memory blocks each carrying this: begin word b+00 where in the memory this block begins (64k addr space) size word b+02 how long is this block bdata [size] b+04 block of Z80 music code data for AY-3-8910 (currently for ZX128 envir.: FFFD=Ctrl, BFFD=Data, and for Amstrad CPC envir.: F6=Switch, F4=Ctrl/Data)
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