Search found 791 matches
- Sat Jun 21, 2008 3:38 pm
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
I've cracked it. I know the cause of the mysterious blip sound in Flashback. I had a thorough play with Gens and the "Game Music Emu" thingamajigy, and based on the modifications made to the Gens core, I was able to trace back the differences between the two, and figure out the cause. The sound crea...
- Thu Jun 19, 2008 5:57 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
- Thu Jun 19, 2008 5:15 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
I think it would be a great idea if the manual was submitted to romhacking.net. Nemesis, you can have the guys at romhacking.net help translate any parts that need clarification (several of them are professionals). Here is a link to the forum that can help: http://www.romhacking.net/forum/index.php...
- Thu Jun 19, 2008 4:59 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Am I the only one who finds the formula for the N3 bit of the keycode confusing? Here's how the YM2608 manual says the N3 bit is calculated, on page 25: N3=F11・( F10+F9+F8 ) + !F11・F10・F9・F8 This is a boolean calculation, so their operator symbols are confusing me a bit. I don't see how addition has...
- Thu Jun 19, 2008 12:49 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Ok, so those register pairs are different again. If that's the correct allocation, that would mean both the documents are wrong. Actually, order which I said is same as in YM2608 doc, just reversed by some reason. Actually, after checking again, the order of the registers you confirmed in your hard...
- Wed Jun 18, 2008 2:38 pm
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Ok, so those register pairs are different again. If that's the correct allocation, that would mean both the documents are wrong. In your testing on the hardware, did you specifically test and confirm the register allocation, or were you just listening to the sound output for the channel as a whole? ...
- Wed Jun 18, 2008 12:19 pm
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Yeah, that's probably it. I found another phonetic entry in the ADPCM section of "Priscal" which is known to definitely mean prescale. It's the part at the end which is throwing me a bit. It almost seems like it's another word tacked on. I was thinking "priscarar" might mean something along the line...
- Wed Jun 18, 2008 6:10 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Yeah, I noticed that. I have a feeling that register may not exist on the YM2612, as according to this documentation, the register defaults to 0, which would mean the chip would power up in 3 channel mode. It's definitely worth testing though. They might have just changed the default. There's also t...
- Tue Jun 17, 2008 10:14 pm
- Forum: Pico
- Topic: Emulating Sega Pico
- Replies: 33
- Views: 63029
I'd just modify a ROM and run it off the flashcart if I wanted to get a Mega Drive game running on the Pico. There are too many differences to just use PAR codes to patch. The control interface doesn't even work in approximately the same way, it's likely attempts to write to the 0xAXXXXX memory bloc...
- Tue Jun 17, 2008 9:36 am
- Forum: Pico
- Topic: Emulating Sega Pico
- Replies: 33
- Views: 63029
- Mon Jun 16, 2008 10:34 pm
- Forum: Pico
- Topic: Emulating Sega Pico
- Replies: 33
- Views: 63029
Yeah, I can manage that. My second Pico unit arrived last week (the first one was "sacrificed" to make the dumper). I haven't tried it out yet though. I'll power it up and capture some audio sometime this week. BTW, once my new etching tank arrives, I should be able to rig up a reverse adapter: Runn...
- Mon Jun 16, 2008 11:47 am
- Forum: Megadrive/Genesis
- Topic: 68000 datasheet
- Replies: 2
- Views: 4441
- Sun Jun 15, 2008 12:08 pm
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Ok, I've just completed a translation of this document, using the OCR function in Adobe Acrobat Professional, and a web-based Japanese translator at http://www.excite.co.jp/world/english which was recommended to me. I've been manually correcting OCR errors along the way, which in some cases meant lo...
- Tue Jun 10, 2008 2:59 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Looking again at the Sega documentation, the formulae they provide for timer calculation are very different to the numbers from the YM2608 manual. Timer A: 18 * (1024 - TIMERA) microseconds TIMER A = all 1's -> 18usec = 0.108ms TIMER A = all 0's -> 8400usec = 18.4ms Timer B: 288 * (256 - TIMERB) mic...
- Tue Jun 10, 2008 1:44 am
- Forum: Sound
- Topic: New Documentation: An authoritative reference on the YM2612
- Replies: 865
- Views: 2151765
Fortunately, they do provide clock-independent formulas for calculating frequency values and timer intervals in this manual: F-Number = (144 * fnote * 2^20 / M) / 2^(B-1) fnote: Frequency Data M: Master clock (Hz) B: Octave Data tA = 72 * (1024 - NA) / M NA: 0~1023 M: Master clock (MHz) tB = 1152 * ...