M68K for DC

[fox68k]

[quote author=Ian_micheal link=board=dcemu;num=1083323639;start=285#289 date=08/01/04 at 19:20:07]


I can show you how and were and what to do with the new core.

[/quote]

Ian, your help is more than welcome.

[fox68k]

[quote author=Alexvrb link=board=dcemu;num=1083323639;start=285#293 date=08/01/04 at 20:16:26]

Fox: What are you gonna call it? F68k? Â* 8)[/quote]

I don't know yet. I'd like to add something that remember the Dreamcast or the SH4.

[fox68k]

[quote author=quzar link=board=dcemu;num=1083323639;start=285#294 date=08/01/04 at 23:57:28]

@Fox: I truely mean no disrespect from this, but what have you done before? Have you ever written 68k cores or something? I would reccomend looking to see how Stef's core works and keeping that in mind as you finish this, because just asm wont give miracle speedups.
[/quote]

Well, i started to write x86 asm 8 years ago, but nothing serious until i started a m68k asm emu for x86 3 years ago called FAME (look for it there). I worked very hard to get a very optimized emulator and specially a very very ACCURATE one (you can check this out in my documentation).

But SH4 is very different to x86. I've been learning SH4 asm for a few months. It is RISC, that means the ISA is not as big as in x86 (CISC), the addressing modes are sometimes $#@!bersome and the whole architecture is different (flags and other things). The only advantage is the register set (more registers, but you can't access it in halves :-/).
All this makes 68k emulation harder than in x86.

I will work hard to get the new core working as soon as possible.

I recommend you to wait to see results about emulation speed.

Stef is a very talented programmer and did a great job with C68k, but i mainly interested in asm. I hope we can join forces soon, cause i want to learn more about emulation (graphics and others).

[fox68k]

[quote author=Stef link=board=dcemu;num=1083323639;start=285#297 date=08/02/04 at 02:40:26]
You can easily test it in Genesis Plus DC or NeoCD by implementing it in the CPU interface (cpu68k.c file).
But as your core isn't very advanced (lack of interrupt) you should test it with a small test code and compore it against others cores
Are the sources availables somewhere ? or you want to first complete it before releasing anything ?[/quote]

Thanks for the suggestions. I take note

Let me finish this thing and get it in GP or NGCD before i release sources. I want to release a complete source code. It will be much better for anyone interested in.

[Alexvrb]

Sounds good to me, Fox. You can always call it DC68k, Dream68k, SuperH68k, something along those lines.

[guymelef]

how about 86'd. like 86 the quarterback or 86 chicken parm

[Hola]

This is wonderfull
A z80 asm core would be kick ass too.

[Ian_micheal]

Neogeo cd needs quiet a few advanced function in the core. Genesis plus would be easyer to get runing with a new core.

[fox68k]

Ian, what do you mean by advanced functions? built-in memory handling support?

[Hola]

Is there a estimated release date plained for this sh4 68000?