Changes
AYC
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- AYCplayer by OVL (MadRam & Beb = Overlanders) [Thanks to F-Key to preserve it]
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- Dual Module Player by Hermol
http://www.cpc-power.com/index.php?page=detail&num=5251
- TsP The Soundtrackker Player by TomEtJerry
http://www.cpc-power.com/index.php?page=detail&num=5075
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- CPC amsdos --> YM2AY (Kit ayc) by MadRam
== AYC file format ==----An AYC file is basically just a particular YM file that has been compressed using a Lempel-Ziv like algorithm.<br />There are two main sections inside an AYC file:<br />* Header* Data === Header === The header contains info about the tune duration, the registers data offset in the file and the buffers sizes for decompression.{| class="wikitable"|-! Offset !! Size !! Description|-| #00 || 2 || Song duration (number of vertical refresh period)|-| #02 || 1 || Buffer size<sup>1</sup> for register 0|-| #03 || 2 || Crunched data offset<sup>2</sup> in the file for register 0|-| ...|-| 3*n + #02 || 1 || Buffer size<sup>1</sup> for register n|-| 3*n + #03 || 2 || Crunched data offset<sup>2</sup> in the file for register n|-| ...|-| #29 || 1 || Buffer size<sup>1</sup> for register 13|-| #2A || 2 || Crunched data offset<sup>2</sup> in the file for register 13|-| #2C || 6 || RESERVED (defaulted to #FFFFFFFFFFFF)|} 1. Two sizes defined in the AYC file format, #01 = 256 bytes, #04 = 1024 bytes<br />2. Relative offsets, you must add n*3+4 to each value (where n is the register number), offset "#2E" for register 0 means that data starts at #2E + 0*3 + 4 = #32 === Data === All registers data have the same format, which is a mix of Patterns and Flags.<br />A Pattern can be of two types ::* a Byte which can be directly send to the PSG:* a Previously played Pattern identified by an offset and a length in the deflated bufferFlags are included in the stream of Patterns to indicate the type of Pattern. To be finished as soon as possible (Fkey) === Sample File === The marvelous "Jim power 2.ym" has been converted to the AYC format and the following is what we get for the header.<br />Let'''s analyse this to understand how it works. [[File:JimPower_AYC_2.jpg]] ===== Header =====* Song length in VBL is : #1CE5 ( ~ 2 minutes 27 seconds)* Register 0 buffer size is #100 bytes* Register 0 Offset is calculated as follow : #002E + 4 + (3 x 0)= #0032* Register 1 buffer syize is #100 bytes* Register 1 Offset is calculated as follow : #03B2 + 4 + (3 x 1) = #03B9* Register 2 buffer size is #100 bytes* Register 2 Offset is calculated as follow : #04DA + 4 + (3 x 2)* ... == ToDo'''==
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- There is only one PC command line util YMTOOL [ST-Sound
