PSPVBA: GameBoy Advance Emulator for PSP v1.2.0 (Media Engine)

[troom]

has any one got megaman zero 2 and so on to work

[pkmaximum]

Sorry if this seems a bit critical ZX-81 but are you saying that we will never obtain a optimal speed like SNES TYL does for many of the games. I have been testing roms after roms and I have not been noticing much of a speed increase from V1.1.0, the sound was a bit better and the speed was a small bit better but nothing to me is still playable. I tried Metroid Zero Mission, Metroid Fusion, Mario Kart, Mario Advanced 1-4, Contra, and Metal Slug. Unfort the frame rate for these games are not playable. I was wondering is this true on how you are not going to be able to get another speed increase because it just seems like so much hard work in vane if we can't get more speed on this emulaotr. =[

[Squidman]

Very nice, there's a small increase of speed in Pokemon Fire Red and Emerald, and Saphire is very playable at 120% speed with the default settings that are there when u start it up.

But Metroid Zero Mission does this to me:


Yes, this is during gameplay!

[BL4Z3D247]

pk try havin the turbo at 2 and the frameskips at 1 and the arm tick at 4 or 5 mayby a little higher i just messed with them and i got FF Tatics runnin way better than lastnight when i was playin it on v1.1.0

[zx-81]

Sorry if this seems a bit critical ZX-81 but are you saying that we will never obtain a optimal speed like SNES TYL does for many of the games.

Yes, just because the hardware we want to emulator is not the same ...

I quote a post i've written on QJ :

GBA -> 32-bit 16.8-MHz ARM
NeoGeo -> 16 bits 12 MHz 68000
Snes -> 16-bits 4 MHz

The PSP is max 333Mhz.

Generally to emulate properly a processor you need multiply the frequency by 25, and it gives you the required frequency for the host processor. Here, 12 * 25 > 300 Mhz, so we can emulate a SNES or NeoGeo.

But for GBA : 16 * 25 > 400 Mhz, so we can see that it will be theoretically very hard to emulate a 32 bits / 16 Mhz ARM processor on a PSP ...

[Video_freak]

oh well. at least we (and by that i mean you) can come close, right

the N64 cpu ran at almost 100 mhz so thats screwed too...

[BL4Z3D247]

hey zx how much faster could u get this bad boy? just curious

[zx-81]

oh well. at least we can come close, right

Yes ... The only remaining thing i can do is to emulate the GFX with the media engine, and disable the sound.

I've tried to rewrite the GBA instruction decoder part without any improvements. It was worst lol !

But even if we rewrite the ARM CPU emulation in MIPS R4000 ASM, according to me, it won't fit the required speed

[Mr. Shizzy]

This is simply amazing!!! This surpassed my wildest dreams on what I expected from this update. Zx - I'm not trying to brown nose, but you truelly are "The Man". The PSP hb scene could never repay you for all you've done. One question - how much room for sound improvement do you foresee in the future? Zx- great job. Thanks for taking on (& conquering) the psp's "Mission Impossible"

[parsifal968]

As disscussed in the "VBA suggestion" thread, i can add several new features, but it won't speed up the emulator.

Only one option:
coding the ARM7 cpu part of GBA in mips(allegrex) assembler and... go fly!

if only the EMU scene of PSP have good coders capable to do ASM!

Wonder to see also other core CPU ported in mips ASM:
68000 (Amiga, AtariST, Megadrive, NeoGeo, MAME)
65c816 (SNES)
6502-6510 (Commodore, MAME)
Z80 (Spectrum, MAME, sound cpu)

Full speed Emulators? ASM... the only choice!