Search found 193 matches

by notaz
Fri Aug 29, 2008 9:00 am
Forum: Hardware
Topic: Handheld Sega Megadrive?
Replies: 25
Views: 16753

The emulator must first be credible. The rest does not matter. How can it be credible while running like a slideshow? With skipping sound? It would be next to useless. Want some help moving the YM2612 to the ME? I intended to do that myself, but never had time for it. It could be tricky to do witho...
by notaz
Thu Aug 28, 2008 10:17 am
Forum: Hardware
Topic: Handheld Sega Megadrive?
Replies: 25
Views: 16753

Yeah, with its "sound". *Sigh*. If GP2X and PSP had YM2612 inside, the emu would have perfect sound. But now having just 200/333MHz I just can't do rendering at the native rates with interpolation, accurate SSG-EG and stuff like that (unless you want it to run @ 5fps). After doing CPUs and graphics...
by notaz
Wed Aug 13, 2008 9:14 am
Forum: Regen
Topic: Old Regen pages
Replies: 547
Views: 727448

Also, it will have 100% compatibility (commercial games). Isn't that claim a bit arrogant, uh? I see it for a while now in your readmes. Even if those recently mentioned games really worked, do you really think all commercial games would work from start to completion, in all game modes without a ti...
by notaz
Tue Jul 29, 2008 10:39 am
Forum: Megadrive/Genesis
Topic: Bug in genesis.c?
Replies: 16
Views: 12972

I've checked what commercial games do again, and they use register, immediate values or RAM as their source operand. Here are some examples: move.w $f640.w, (A5) ; a5=00c0000 move.w D0, (A4) ; a4=00c0000 move.w (A1)+, (A0) ; a0=00c00004, a1=ffffe4be There are some games (mostly Konami) which only us...
by notaz
Mon Jul 28, 2008 11:51 am
Forum: Megadrive/Genesis
Topic: Bug in genesis.c?
Replies: 16
Views: 12972

Many commercial games start ROM->VRAM (and even RAM->VRAM) DMAs while running from ROM, so there is nothing to worry about.
by notaz
Sat Jul 19, 2008 11:29 am
Forum: Pico
Topic: Emulating Sega Pico
Replies: 33
Views: 62922

Thanks for the info. Looks like you are right, and the chip sits there in the slave mode.

Great to see you here, Charles!
by notaz
Sun Jun 29, 2008 12:52 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 865
Views: 2143851

Nemesis wrote:I haven't come across any Mega Drive emulator which emulates CSM mode as of yet.
It works in MESS, as MAME YM2612 core supports CSM mode.
by notaz
Thu Jun 26, 2008 7:00 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 865
Views: 2143851

what did you do exactly to fix the MAME core ? I changed the start of refresh_fc_eg_slot() to this: INLINE void refresh_fc_eg_slot(FM_SLOT *SLOT, int fc, int kc) { int ksr, fdt; /* (frequency) phase increment counter */ fdt = fc+SLOT->DT[kc]; /* detect overflow */ if (fdt < 0) fdt += fn_table[0x7ff...
by notaz
Tue Jun 24, 2008 8:44 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 865
Views: 2143851

Looking forward to "Undocumented YM2612 features" doc :)
by notaz
Mon Jun 23, 2008 9:59 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 865
Views: 2143851

Tried to add handling for this into MAME core. It took a while to figure out that the behavior Nemesis described is not what actually causes the 'blip' sound, the blip comes from operator1, and the described operator2 behavior eliminates the 'blip' :) For some reason I'm getting the best results whe...
by notaz
Mon Jun 23, 2008 1:23 pm
Forum: Sound
Topic: New Documentation: An authoritative reference on the YM2612
Replies: 865
Views: 2143851

I just want to add my thanks for your work, Nem!
by notaz
Thu Jun 19, 2008 8:39 am
Forum: Megadrive/Genesis
Topic: questions about chaos engine/soldiers of fortune graphics
Replies: 23
Views: 18428

I've tested this on Gens Linux port and it works. You probably placed it in wrong function or in wrong loop.
gensx.cpp you posted before is not related to emulation much, it's just xbox specific code, you don't need to modify it.
by notaz
Mon Jun 16, 2008 5:35 pm
Forum: Pico
Topic: Emulating Sega Pico
Replies: 33
Views: 62922

Hey Nemesis, can you do some sound recordings of Sonic PCM samples from the real hardware? I just wonder how they are supposed to sound.
by notaz
Mon Jun 16, 2008 12:42 pm
Forum: Regen
Topic: Old Regen pages
Replies: 547
Views: 727448

Chilly Willy wrote: I mainly use PicoDrive on my PSP.
Nice to hear that :) I've succeeded improving performance ~5-10% for all games, just need to do some more polishing before release.
by notaz
Mon Jun 16, 2008 12:34 pm
Forum: Megadrive/Genesis
Topic: questions about chaos engine/soldiers of fortune graphics
Replies: 23
Views: 18428

The best solution would be adding VDP FIFO support to Gens, but if you can't do that, and don't mind having special version of Gens made specially for that game, just add this hack: Do_Genesis_Frame() function, very first first 'for' loop, after these lines Fix_Controllers(); Cycles_M68K += CPL_M68K...