Difference between revisions of "After Burner II/Technical information"

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==ROM dump status==
 
==ROM dump status==
 
{{romtable|
 
{{romtable|
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{{rom|MD|sha1=523e4abdf19794a167a347b7eeca79907416e084|md5=75458e38c278f61c06dabacc744b5fe1|crc32=ccafe00e|size=512kB|date=1989-12|source=Cartridge (US/EU)|comments=|quality=good}}
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{{rom|NES|sha1=BCD6794579A743211CF96A306EB97E74A0C33EF6|md5=90569ABF1E02215E77DAEB20CF0B4351|crc32=F2CE3641|size=384kB|date=|source=Cartridge (JP)|comments=|quality=good}}
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{{rom|NES|sha1=56C3D55654D0E837082978505653F6E1E0D52D6F|md5=05A060C597E1E5DC251A4AD309ECED65|crc32=F699EE7E|size=384kB|date=|source=Cartridge (US)|comments=(Unl)|quality=good}}
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{{rom|PCE|sha1=50B9D22FE5179AEE5CB95022472714EF8483841F|md5=AC0CDEE014E725E428FDE5774751FF8D|crc32=CA72A828|size=512kB|date=|source=Card (JP)|comments=|quality=|prototype=}}
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{{rom|PCE|sha1=50B9D22FE5179AEE5CB95022472714EF8483841F|md5=AC0CDEE014E725E428FDE5774751FF8D|crc32=CA72A828|size=512kB|date=|source=Card (JP)|comments=|quality=}}
 
}}
 
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{{ROMHeader|53 45 47 41 20 4D 45 47 41 20 44 52 49 56 45 20 28 43 29 54 2D 31 37 20 31 39 38 39 2C 44 45 43 B1 CC C0 B0 CA DE B0 C5 B0 49 49 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 41 46 54 45 52 20 42 55 52 4E 45 52 49 49 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 47 4D 20 4D 4B 2D 31 31 30 34 20 2D 30 30 BA D0 4A 41 20 20 20 20 20 20 20 20 20 20 20 20 20 20 00 00 00 00 00 07 FF FF 00 FF 00 00 00 FF FF FF 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 55 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20|type=MD|region=NTSC-U/PAL}}
 +
==PCM Driver==
 +
<!--Anyone who discovered this technique or knows what the heck to call the Sega Mega Drive's integrated PSG chip, please edit this section, because I've been losing hair trying to figure out just when this was first known. Did Savaged Regime/lazygecko figure it out? He mentions it in his PCM video.-->
 +
 +
One of the unusual quirks of the Mega Drive version of After Burner II is its custom PCM driver. While most Mega Drive games use the YM2612's built-in programmable DAC, After Burner II opts to use the PSG in the Mega Drive as a sample chip. This is done by setting the PSG's channels to supersonic frequencies, and directly manipulating the volume registers. The game can play three 4-bit PCM samples at once, with one channel reserved for drums.
 +
 +
The drawback of this feature is the samples are very quiet, necessitating the music being designed around the samples and in turn, the YM2612's [https://segaretro.org/User:Chimes/Low_volume_distortion low volume distortion]. When Sega fixed the YM2612's volume bug on later Mega Drive consoles, the game sounds too quiet with instruments being missing.
 +
 +
No other game (or Mega Drive software, for that matter) uses the PSG in this manner. In fact, the only games that use this technique are Master System and Game Gear games, namely ''[[Alex Kidd: The Lost Stars]]''.{{ref|http://ghostarchive.org/varchive/45djB6VITtQ|2=https://www.youtube.com/watch?v=45djB6VITtQ}}
 +
 
==References==
 
==References==
 
<references/>
 
<references/>
  
 
{{AfterBurnerIIOmni}}
 
{{AfterBurnerIIOmni}}

Latest revision as of 17:41, 21 September 2024

Back to: After Burner II.

ROM dump status

System Hash Size Build Date Source Comments
Sega Mega Drive
✔
CRC32 ccafe00e
MD5 75458e38c278f61c06dabacc744b5fe1
SHA-1 523e4abdf19794a167a347b7eeca79907416e084
512kB 1989-12 Cartridge (US/EU)
Sega Mega Drive
✔
CRC32 4ff37e66
MD5 bcb26dc14405b4c909d46626f9eec01f
SHA-1 8f1e6a3e83094e5d0e237d6a1ffcc87171595ea5
512kB 1989-12 Cartridge (JP)
Nintendo Entertainment System
✔
CRC32 f2ce3641
MD5 90569abf1e02215e77daeb20cf0b4351
SHA-1 bcd6794579a743211cf96a306eb97e74a0c33ef6
384kB Cartridge (JP)
Nintendo Entertainment System
✔
CRC32 f699ee7e
MD5 05a060c597e1e5dc251a4ad309eced65
SHA-1 56c3d55654d0e837082978505653f6e1e0d52d6f
384kB Cartridge (US) (Unl)
PC Engine
 ?
CRC32 ca72a828
MD5 ac0cdee014e725e428fde5774751ff8d
SHA-1 50b9d22fe5179aee5cb95022472714ef8483841f
512kB Card (JP)

Identifiers

ROM header



Mega Drive (NTSC-J)
Offset Contents (hexadecimal) Decoded text
00000100
00000110
00000120
00000130
00000140
00000150
00000160
00000170
00000180
00000190
000001A0
000001B0
000001C0
000001D0
000001E0
000001F0 		53 45 47 41 20 4D 45 47 41 20 44 52 49 56 45 20
28 43 29 54 2D 31 37 20 31 39 38 39 2C 44 45 43
B1 CC C0 B0 CA DE B0 C5 B0 49 49 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
41 46 54 45 52 20 42 55 52 4E 45 52 49 49 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
47 4D 20 54 2D 31 37 30 31 33 20 2D 30 30 28 6B
4A 41 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00 00 00 00 00 07 FF FF 00 FF 00 00 00 FF FF FF
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
4A 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
 SEGA MEGA DRIVE 
(C)T-17 1989,DEC
ｱﾌﾀｰﾊﾞｰﾅｰII     
                
                
AFTER BURNERII  
                
                
GM T-17013 -00(k
JA              
                
                
                
                
                
J               



Mega Drive (NTSC-U/PAL)
Offset Contents (hexadecimal) Decoded text
00000100
00000110
00000120
00000130
00000140
00000150
00000160
00000170
00000180
00000190
000001A0
000001B0
000001C0
000001D0
000001E0
000001F0 		53 45 47 41 20 4D 45 47 41 20 44 52 49 56 45 20
28 43 29 54 2D 31 37 20 31 39 38 39 2C 44 45 43
B1 CC C0 B0 CA DE B0 C5 B0 49 49 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
41 46 54 45 52 20 42 55 52 4E 45 52 49 49 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
47 4D 20 4D 4B 2D 31 31 30 34 20 2D 30 30 BA D0
4A 41 20 20 20 20 20 20 20 20 20 20 20 20 20 20
00 00 00 00 00 07 FF FF 00 FF 00 00 00 FF FF FF
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
55 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
 SEGA MEGA DRIVE 
(C)T-17 1989,DEC
ｱﾌﾀｰﾊﾞｰﾅｰII     
                
                
AFTER BURNERII  
                
                
GM MK-1104 -00  
JA              
                
                
                
                
                
U               

PCM Driver

One of the unusual quirks of the Mega Drive version of After Burner II is its custom PCM driver. While most Mega Drive games use the YM2612's built-in programmable DAC, After Burner II opts to use the PSG in the Mega Drive as a sample chip. This is done by setting the PSG's channels to supersonic frequencies, and directly manipulating the volume registers. The game can play three 4-bit PCM samples at once, with one channel reserved for drums.

The drawback of this feature is the samples are very quiet, necessitating the music being designed around the samples and in turn, the YM2612's low volume distortion. When Sega fixed the YM2612's volume bug on later Mega Drive consoles, the game sounds too quiet with instruments being missing.

No other game (or Mega Drive software, for that matter) uses the PSG in this manner. In fact, the only games that use this technique are Master System and Game Gear games, namely Alex Kidd: The Lost Stars.[1]

References

  1. ↑ https://www.youtube.com/watch?v=45djB6VITtQ (Ghostarchive)


After Burner II

After Burner II Title.png

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Music: Yu Suzuki Produce After Burner II (1997) | After Burner II (2018)

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