Difference between revisions of "After Burner II/Technical information"
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==ROM dump status== | ==ROM dump status== | ||
{{romtable| | {{romtable| | ||
− | {{rom|MD|sha1=523e4abdf19794a167a347b7eeca79907416e084|md5=75458e38c278f61c06dabacc744b5fe1|crc32=ccafe00e|size=512kB|date=1989-12|source=Cartridge (US/EU)|comments=|quality=good | + | {{rom|MD|sha1=523e4abdf19794a167a347b7eeca79907416e084|md5=75458e38c278f61c06dabacc744b5fe1|crc32=ccafe00e|size=512kB|date=1989-12|source=Cartridge (US/EU)|comments=|quality=good}} |
− | {{rom|MD|sha1=8f1e6a3e83094e5d0e237d6a1ffcc87171595ea5|md5=bcb26dc14405b4c909d46626f9eec01f|crc32=4ff37e66|size=512kB|date=1989-12|source=Cartridge (JP)|comments=|quality=good | + | {{rom|MD|sha1=8f1e6a3e83094e5d0e237d6a1ffcc87171595ea5|md5=bcb26dc14405b4c909d46626f9eec01f|crc32=4ff37e66|size=512kB|date=1989-12|source=Cartridge (JP)|comments=|quality=good}} |
− | {{rom|NES|sha1=BCD6794579A743211CF96A306EB97E74A0C33EF6|md5=90569ABF1E02215E77DAEB20CF0B4351|crc32=F2CE3641|size=384kB|date=|source=Cartridge (JP)|comments=|quality=good | + | {{rom|NES|sha1=BCD6794579A743211CF96A306EB97E74A0C33EF6|md5=90569ABF1E02215E77DAEB20CF0B4351|crc32=F2CE3641|size=384kB|date=|source=Cartridge (JP)|comments=|quality=good}} |
− | {{rom|NES|sha1=56C3D55654D0E837082978505653F6E1E0D52D6F|md5=05A060C597E1E5DC251A4AD309ECED65|crc32=F699EE7E|size=384kB|date=|source=Cartridge (US)|comments=(Unl)|quality=good | + | {{rom|NES|sha1=56C3D55654D0E837082978505653F6E1E0D52D6F|md5=05A060C597E1E5DC251A4AD309ECED65|crc32=F699EE7E|size=384kB|date=|source=Cartridge (US)|comments=(Unl)|quality=good}} |
− | {{rom|PCE|sha1=50B9D22FE5179AEE5CB95022472714EF8483841F|md5=AC0CDEE014E725E428FDE5774751FF8D|crc32=CA72A828|size=512kB|date=|source=Card (JP)|comments=|quality | + | {{rom|PCE|sha1=50B9D22FE5179AEE5CB95022472714EF8483841F|md5=AC0CDEE014E725E428FDE5774751FF8D|crc32=CA72A828|size=512kB|date=|source=Card (JP)|comments=|quality=}} |
}} | }} | ||
Latest revision as of 17:41, 21 September 2024
- Back to: After Burner II.
ROM dump status
System | Hash | Size | Build Date | Source | Comments | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
✔ |
|
512kB | 1989-12 | Cartridge (US/EU) | ||||||||||
✔ |
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512kB | 1989-12 | Cartridge (JP) | ||||||||||
✔ |
|
384kB | Cartridge (JP) | |||||||||||
✔ |
|
384kB | Cartridge (US) | (Unl) | ||||||||||
? |
|
512kB | Card (JP) |
Identifiers
ROM header
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 アフターバーナーII AFTER BURNERII GM T-17013 -00(k JA 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 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 アフターバーナー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
- ↑ https://www.youtube.com/watch?v=45djB6VITtQ (Ghostarchive)
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