M68K for DC

[BlackAura]

Basically, it's to avoid having the original BIOS image. Instead, the code for an invalid instruction is inserted into the locations where the BIOS functions normally reside. When the NeoGeo CD game calls a BIOS function, it hits the invalid instruction. The emulator then calls some native code depending on which invalid instruction was issued.

[fox68k]

[quote author=BlackAura link=board=dcemu;num=1083323639;start=375#378 date=09/09/04 at 19:07:52]I guess it's supposed to be compatable with FAME, right?

In that case, if we made the PC version on an emulator work with FAME, would it be fairly easy to get the DC version working with the SH-4 one?[/quote]

Exactly. Fully compatible. API will be the same.

[fox68k]

[quote author=Ian_micheal link=board=dcemu;num=1083323639;start=375#379 date=09/09/04 at 21:03:00]
Ok in Â*m68k_in.c we have to have this HLE functions.

/* NeoCD declarations */
void Â* Â*cdrom_load_files(void);
void Â* Â*neogeo_cdda_control(void);
void Â* Â*neogeo_prio_switch(void);
void Â* Â*neogeo_upload(void);

extern int img_display;


M68KMAKE_OP(1111, 0, ., .)
{
Â* Â* Â*switch (REG_IR) {
Â* Â* Â*case 0xfabe: neogeo_exit(); break;
Â* Â* Â*case 0xfabf: img_display=1; cdrom_load_files(); break;
Â* Â* Â*case 0xfac0: img_display=0; cdrom_load_files(); break;
Â* Â* Â*case 0xfac1: neogeo_upload(); break;
Â* Â* Â*case 0xfac2: neogeo_prio_switch(); break;
Â* Â* Â*case 0xfac3: neogeo_cdda_control(); break;
Â* Â* Â*default: m68ki_exception_1111(); break;
Â* Â* Â*}
}


So yes with out this it would not work for neogeo cd.
[/quote]

I would like to figure out a pretty way to accomplish that task. I can think of an array of pointers to customize interrupt handling. This is, NULL meaning normal autovectored handling and a function pointer for custom processing.

Tell me about this idea and how good could it be in NeoCD.

And thank you for your GREAT work on the DC emu scene. I hope you find my emu useful.

Cheers.

[Eric]

this is wicked i cant wait to see this update on the emus no offense it was still amazing with Stefs work cause the coders were able to bring emu's more speed and its thanks to you 2 for these great updates and hopefully in the future we are able to bring more to emu's like a fullspeed SNES emu and i know M68k wont work for SNES but there has to be away of speeding that up

[Alexvrb]

Both SFC and DSNES are already using the same asm CPU core written for DSNES. So unless someone starts working on amazingly hard on optimizing sound or video, don't count on speed boosts for a while.

[ron]

Yesterday CHui and Me have released the first port of DCaSTaway, using OpenM68K core. The emu runs and emulates games 100 % and you can use the mouse and the joy for playing games or software. Many other better things will come up and of course, let's talk about the availability of your M68K cores for SH4. In www.talfi.net and here self you can follow the progress of the emu and download a version to tryout. It's Still very WIP and needs more speed. Actually we're getting almost 85% speed comparing with an original ST. Thats a good new and at the end an ATARI ST EMU for our Dreamcasts. Cheers

[DemoniusX]

now I just need a DC keyboard.

[ron]

I NEED YOUR M68K CORES FOR A GREATEST M68K COMPUTER EMULATOR PROJECT.

Dear friends, is time to ask the experts in M68K and, after seen the ability for porting software and emulators to the DC. I need your help . Please send me a private, for contact.

[Ian_micheal]

[quote author=fox68k link=board=dcemu;num=1083323639;start=375#382 date=09/11/04 at 05:42:34]

I would like to figure out a pretty way to accomplish that task. I can think of an array of pointers to customize interrupt handling. This is, NULL meaning normal autovectored handling and a function pointer for custom processing.

Tell me about this idea and how good could it be in NeoCD.

And thank you for your GREAT work on the DC emu scene. I hope you find my emu useful.

Cheers.[/quote]

What i need is 5 to 10% more speed from this core c68k gave me fullspeed with out sfx with sfx running it's taking 15%. If the m68k was 5 to 10% better i would be geting near fullspeed with sfx meaning totaly finshed neogeo cd port for dc same speed Â*and sound. Im not fussed how it's done im going to have to learn the function naming maybe it might be a good idea to show a FAQ chart on how each function is compared to m68k in mame or c68k from stef.

I was thinking about Making neogeo cd work on the pc with your core sounds like a good idea.

I dont want to use any frameskip at all refuse to for this project. We need full frame anmation like 9.3 fighting games need to be smooth and fluid.

[Stef]

[quote author=ron link=board=dcemu;num=1083323639;start=375#387 date=09/18/04 at 16:54:38]I NEED YOUR M68K CORES FOR A GREATEST M68K COMPUTER EMULATOR PROJECT.

Dear friends, is time to ask the experts in M68K and, after seen the ability for porting software and emulators to the DC. I need your help . Please send me a private, for contact.[/quote]

Mine is always available at http://gens.consolemul.com/download/c68k_src.zip

You'll probably need some help to use it, don't hesitate to ask here