Search found 256 matches

by mickagame
Fri May 29, 2015 1:02 pm
Forum: Hardware
Topic: Does Memory Chip have endianness?
Replies: 3
Views: 9025

I think whatever th access m68000 do (word or byte) the 68000 always do word access. Lds and uds complete the access. In exemple i take the m68000 do word access and because uds is set (access to addr 0x000000 so msb) the CPU takes only thé msb of the word and put in register. That s my point of vie...
by mickagame
Fri May 29, 2015 6:16 am
Forum: Hardware
Topic: Does Memory Chip have endianness?
Replies: 3
Views: 9025

Does Memory Chip have endianness?

Writing my genesis emulator i'm asking myself question about memory Chip. Does a memory chip is made to take part or in MSB or LSB system? If i take the example of M68000. If I write 0x1100 at 0x000000, the processor waiting that : - If I read data at 0x000000 it return 0x11 (MSB) - If I read data a...
by mickagame
Tue May 26, 2015 7:51 pm
Forum: Video Display Processor
Topic: Understanding VDP
Replies: 10
Views: 12902

It make sens !!!
by mickagame
Mon May 25, 2015 9:26 pm
Forum: Video Display Processor
Topic: Understanding VDP
Replies: 10
Views: 12902

Why thé 68k will hang? The read will be perform when write will be finish?
by mickagame
Mon May 25, 2015 9:42 am
Forum: Video Display Processor
Topic: Understanding VDP
Replies: 10
Views: 12902

Thanks for your help if i need i will ask u :-)

If i read VRAM from 68K bus and that FIFO is not empty
=> The read isn't performed until the FIFO is empty.

So the DTACK signal from 68k bus remain high until the data become available (so the 68K is locked)? Or there's another mecanism involved?
by mickagame
Mon May 25, 2015 6:09 am
Forum: Video Display Processor
Topic: Understanding VDP
Replies: 10
Views: 12902

Ok that's more clear :-)
I will try to look in exodus see how nemesis implements this.
Thank u !
by mickagame
Sun May 24, 2015 9:32 pm
Forum: Video Display Processor
Topic: Understanding VDP
Replies: 10
Views: 12902

Thanks for this informations ! I would need more details about how the FIFO is filled. For example when i write data to VRAM : 1) Data is writed to data port 2) The FIFO is immediately written with this data? 3) Next external slot the VDP take the data from FIFO and write to VRAM If my step 2) is co...
by mickagame
Sun May 24, 2015 7:30 pm
Forum: Video Display Processor
Topic: Understanding VDP
Replies: 10
Views: 12902

Understanding VDP

Reading the documentation of Nemesis I understand that VDP access to VRAM are divided in slots. There are slots called "external slots access". When performing DMA The DMA use these slots to access VRAM? There is a link between these slots and the VDP FIFO? I work actually on a VDP core at slot leve...
by mickagame
Sat May 02, 2015 1:01 pm
Forum: Exodus
Topic: Exodus 2.0 + Open Source Release
Replies: 105
Views: 302049

If u want play games with emulator 100% compatibility i told u play With retroarch and genesis plus core. Is perfect !
by mickagame
Fri May 01, 2015 5:50 am
Forum: Exodus
Topic: Exodus 2.0 + Open Source Release
Replies: 105
Views: 302049

Nemesis.
I've just build successfully Exodus but all files (exe, dll ...) are build in the root directory of the project instead of the build directory.
by mickagame
Thu Apr 30, 2015 8:43 pm
Forum: Exodus
Topic: Exodus 2.0 + Open Source Release
Replies: 105
Views: 302049

Thanks !!!!!!!!!!!!!!!!! Help me very much !
by mickagame
Thu Apr 30, 2015 8:37 pm
Forum: Exodus
Topic: Exodus 2.0 + Open Source Release
Replies: 105
Views: 302049

The site is offline and i would like create a project to compil exodus.
Does someone has the instructions provided of the site in other place?
by mickagame
Thu Apr 30, 2015 9:41 am
Forum: Exodus
Topic: Exodus 2.0 + Open Source Release
Replies: 105
Views: 302049

I m exploring the doc and the code and i m really impressed by your work.
My project would be to compil exodus as a dll core for retroarch.
Even if system is based on dll plugin u think nemesis would be possible to compil Exodus genesis émulation like a whole dll easily?
by mickagame
Wed Apr 29, 2015 8:29 pm
Forum: Megadrive/Genesis
Topic: Cycle accurate emulation: Exodus 2.0 + Open Source Release
Replies: 10
Views: 7500

I don't have access to the site.
What hour exodus will be released? :-)
by mickagame
Mon Apr 27, 2015 4:24 pm
Forum: Megadrive/Genesis
Topic: Cycle accurate emulation: Exodus 2.0 + Open Source Release
Replies: 10
Views: 7500

Do u think would be easy to compil Exodus like a core for retroarch? I know the interface of the core because i do my self a core version of my emulator.