M68K for DC

[Ian_micheal]

Hmm whats the compatabilty like with it ? Speed is great but does it perform with out games breaking? Or is that fixed. I have fullspeed now on neogeo with out frameskip on most games after pvr dma rending it was fast enff for me to take frameskip 4 off and underclocking.

So this core would push it to fullspeed with SFX if it's that fast and does not break any thing in the emulator.

Worth a try but can some one make it so it compiles with a normal kos make file for me just cant seem to get it to compile might be im using GCC 2.9.5

[Stef]

[quote author=Ian_micheal link=board=dcemu;num=1083323639;start=210#210 date=06/14/04 at 07:45:42]
Hmm whats Â*the compatabilty Â*like with it ? Â*Speed is great but does it perform with out games breaking? Or is that fixed. Â*I have fullspeed now on neogeo with out frameskip on most games after pvr dma rending it was fast enff for me to take frameskip 4 off and underclocking.

So this core would push it to fullspeed with SFX if it's that fast and does not break any thing in the emulator.

Worth a try but can some one make it so it compiles with a normal kos make file for me just cant seem to get it to compile might be im using Â*GCC 2.9.5
[/quote]

I guess C68K can bring NeoCD to complete fullspeed, maybe you'll be even capable to add a 68000 overclocking feature for game as Metal Slug which has slowdown even on real hardware
Compatibility of C68K is better since i fixed MOVEM instruction, but i'm sure it still contains bugs, i tested about 10 genesis games and they all worked perfectly, so compatibility isn't that bad, but not perfect too ... of course, it'll become perfect, it just requires me sometime to fix the last bugs

And now C68K is really close to musashi in use, except you still have to define a "fetch area" (area where code is fetched)...
I uploaded the last version of C68K here :
http://gens.consolemul.com/download/GenPlus_DC.zip

It's the complete source of Genesis Plus with C68K included so it also contains CPU interface (cpu68k.c & cpu68.h files) to easily change from musashi to C68K

If you have some time to look into that, i would love to know how C68K perform with NeoCD i didn't had the time to test it myself :-/

For compilation, i'll upload the C68K objects files (.o) after my job

[BlackAura]

Hola - At the moment, it simply won't run at full speed with sound at all, even if you completely disable the video system. I've tried. The sound CPU (Z80) emulation is just way too slow. Stef's main CPU (68k) emulator will help, but the Z80 emulator still needs work, and nobody's touched it yet. Sound is really a pretty low priority at this stage.

I have exams starting tomorrow, so I probably won't be able to do much. There's only one exam I'm at all worried about ("IT Professional Studies", which is the most stupid subject I've ever had to do), and that's on Wednesday, so after that I'll have a muck around with c68k, and see what happens.

[quzar]

Isnt the z80 core in some other emulator written in sh-2 asm? if so then that should be switched in as it is probably the most advanced z80 core that the DC could use.

[Hola]

Nope there's no Z80 core in Sh2 or trust me people would be using it.

[Christuserloeser]

@quzar: You mean the one for the SEGA Saturn SMS emu, am I correct?

http://smsemu.emuunlim.com look under misc

excyber.txt - ExCyber thoughts on optimizing Z80 emu core for Saturn's SH2s
z80sh2.txt - Just an useless comments on x86 asm optionally used in Z80 core and how it can be rewrited to sh2

Edit: There seems to be no source available...

[email protected]

old hp: phemusat.tripod.com



Chris

[Alexvrb]

I'm pretty sure that core is portable C with optional x86 asm, no SH2 asm at all. What Z80 core are you guys using right now for GP/DC and NeoCD/SDL DC? It could be better anyway.

[Coagulus]

Wasn't SMEG written in SH4? That would have a Z80 core in it. Is the author (Heliophobe?) still around or is the source available for that?

[Christuserloeser]

No, SMEG wasn't written in SH4 - though I am not sure, maybe Heliophobe can do sth like that. He is a very talented devver and, yes, he is still around


Chris

[BlackAura]

Smeg used the same Z80 emulator that Genesis Plus and MAME use. The Saturn stuff used a different one, which may or may not be faster. Worth a try.