In Game Sound Engine

[Richi_S]

As I announced in the previous topic Yet another sound system,

I finally release my In Game Sound Engine:

 

IGSE.bin

 

IGSE.txt

 

Just rename it to IGSE.asm and have some fun.

 

Please post Your opinion, bugs You found, and and Your suggestions!

[Richi_S]

If you want to make your own music I recommend:

SoundX__1994___Hozer_Video_Games__Ed_Federmeyer___WIP___a1_.bin

So that you can hear how the instruments you choose might sound.

 

The batari Basic Music and Sound Page

To convert real notes in Atari 2600 values.

 

And finally

Anvil Studio

A great freeware MIDI editor.

It features a Mixer that lets you strip down existing midi files to two track Atari 2600 music,

and a Piano Roll Editor, which enables even persons with limited musical talent (like myself) to generate nice music.

It also displays the notes of a given Midi File very similar to the Pattern & Beat system I use.

[Richi_S]

Quickstart: How To use The In Game Sound System

 

Some basic definitions:

• TV Frame: The TV Frame is the smallest unit (60Hz, NTSC). On every TV Frame the AUDFx and AUDVx registers are updated from the Special instrument tables, the Special Instrument pointer(Music_special_pointer_X) is increased.
  
• Note: Depending on the music timers prescaler (Music_timer, MUSIC_TIMER_PRESCALER) a defined number of TV Frames form one Note. If a new note is loaded the AUDFx_base register is loaded and the special instrument pointer (Music_special_pointer_X) is reloaded, the beat offset pointer is reseted (Music_beat_pointer_X_offset).
  
• Beat: Eight Notes form a Beat (Music_beatX_AUDF). To every Beat a Instrument (Tia Instrument and Special Instrument Modifier, Music_PatternX_Instrument) is assigned.
  
• Pattern: A Pattern is two Tables (Music_PatternX , Music_PatternX_Instrument ) that links to the Beats and assigns Instruments to the Beats.
  
• Song: A Song consists of two channels. It defines the starting Point and the end point and the Loop in Point of the Patterns (MUSIC_SONG_START, MUSIC_SONG_END, MUSIC_SONG_LOOP_TO).
  
• Channel: The Atari 2600 has got two channels. Every channels has got its own Pattern, Beats and Notes.
  

 

 

The Pattern

The pattern is played from Lesf to the right.

There is defined

• A starting point (MUSIC_SONG_START)
  
• A End point (MUSIC_SONG_END)
  
• A point where the Song shall repeat after the pattern has reached the end point (MUSIC_SONG_LOOP_TO)
  

 

 

The Notes

• The Pattern table points to a Address in the Music_beatX_AUDF table
  
• The values in the table are the Notes (AUDFx). #99 is Silence (Pause)
  
• The Beat Table is played from left to the right.
  
• If all eight notes of one beat are played, the next beat from the pattern table is loaded.
  

 

 

The Instrument

• Every Patterns Beat has got its Instrument (Instrument Number in Music_PatternX_Instrument).
  
• The Instrument Number is divided in two Nibbles
  
• The Instrument Numbers Low Nibble is the TIA Instrument (AUDCx Register)
  
• The Instrument Numbers High Nibble is the Number of the Special Instrument.
  
• By using the Music_special_instrument_pointer the starting address of the Music_special_AUDV_table and Music_special_AUDF_table is identified.
  
• Every TV Frame the pointer to these tales is increased, the Tables are read from left to right.
  
• The AUDV register is updated every TV Frame with the value from the Music_special_AUDV_table.
  
• The AUDF register is updated every TV Frame with the value from the Music_special_AUDF_table plus the value of the note to be played.
  

Edited July 27, 2009 by Richi_S

[yuppicide]

Sounds very interesting. I did have a read over some of the information and don't totally understand it all, but I heard your Contra (wasn't it Contra) and it was great.

 

I have always been interested in trying to convert over some of my friends band into the Atari 2600 and maybe this will help looking at Anvil. I know the songs won't sound the same, but if I can play them for my friend I'd be happy if they figured out it was their own song.

[+grafixbmp]

What amout of cycles and area of a full frame does it take up?

[Richi_S]

Well, I'd say 3 to 5. I did not count them, or did any tests on that.

While programming the code I started it as a part of a game.

I did not use a timer like in the released code. I was just using STA WSYNC.

In the Engine code, every now and than, five STA WSYNC commands had been placed and it worked fine.

[+Random Terrain]

If you want to make your own music I recommend:

SoundX__1994___Hozer_Video_Games__Ed_Federmeyer___WIP___a1_.bin

So that you can hear how the instruments you choose might sound.

Is that better than Tone Toy 2008:

 

http://www.randomterrain.com/atari-2600-memories-program-tone-toy-2008.html

[Richi_S]

Wow, Tone Toy is a great tool... Thanks for telling me.

With the sound loop function I can get a good feeling how the "Special Instruments" will sound like, when programming them.

Without that tool it is a lot more trial and error.

[Tr3vor]

If you want to make your own music I recommend:

SoundX__1994___Hozer_Video_Games__Ed_Federmeyer___WIP___a1_.bin

So that you can hear how the instruments you choose might sound.

Is that better than Tone Toy 2008:

 

http://www.randomter...e-toy-2008.html

 

 

why is the page not found?

 

i saw your video on youtube about it and want to try that out so I can see all the weird sounds the 2600 makes.

Edited November 19, 2009 by Tr3vor

[+Random Terrain]

Why is the page not found?

Maybe there was a temporary problem. Seems to be working fine now:

 

http ://www.randomterrain.com/atari-2600-memories-program-tone-toy-2008.html

 

 

And for those who don't know, I have a new Data Creation Toy for batari Basic users:

 

http ://www.randomterrain.com/atari-2600-memories-batari-basic-music-toy.html

 

Play real Atari 2600 sounds online and create music data for bB programs.

Edited November 20, 2009 by Random Terrain