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The SH2/VDP1/VDP2/SCU clocks are generated by a PLL (IC20), which uses 14.318MHz * 2 = 28.6 MHz in 352px mode. In 320px mode, it runs the frequency through a 1708/1820 divider to get 26.8MHz. SCU DSP runs at half of that. In PAL units it uses a 17,734 MHz crystal and it is run through a 910/1135 di...

Thanks for this complete answer ! So it could be possible to overclock the saturn but not without affecting video signal?

Hello everyone.

I'm taking benefits of this post to ask a a question about saturn hardware.
How is handle the SH2 clock?
The SH2 generates its own clock and output it to the vdp?
SH2 takes an input clock derived from a master clock (like the 68000 is Master Clock / 7 for a sega genesis)?

Thanks !

If i undst good the shema from Nemesis : Slot 12 : When Hsync go high the line start to be drawn on tv Slot 6 to 13 : The first left scrolled 2 cells are fetched and output to internal line buffer => During this period 2 cells fulling with background color are output to tv (left border) Slot 14 to 2...

Thanks for the links

Thanks for your answer.
Does the latency affect the dtack signal from vdp to 68K when perform a read or write operation?

Does The DMA is using the external access slot to transfert data from/to vram?
What happen for example if there is a dma fill or dma copy and the 68k try to access vram?

I would like to know if exist a documentation compiling all informations about the genesis vdp (description of all slot, register latch timing, interrupt timing ...).

If i take your notes Nemesis. From Access Slot 6 to 13 (2 cells Border) datas from 2 first displayed cells are latched and renderer in a 2 cells buffer. During Access Clots 14 to 21 (2 first displayed cells) pixels are generated from the buffer and during this time datas from displayed cells 3 and 4...

Hi Nemesis. The debugger of Exodus is very useful to me to program my emulator. Tanks to your work.

All works OK now thanks for your help

Thanks for your answer. I would like to understand the utility of Z80 interrupt that is asserted every frame durng one line.
Perhaps this is noob question but i'm sjust starting adding audio part in my emulator.

Does anyone knows if Sonic 2 Z80 access M68K memory via bank space mecanism? Or all datas are loaded in Z80 Memory?

I'm currently testing The Z80 part in my emulator.
Does exist some Z80 test rom?

Hi Nemesis.
Super Street Fighter 2 show a red screen at start.
Does Exodus can support it?

Does anyone knows what happens when reading higher byte of I/O ports?
In doc they said that in case of byte access only lower byte is meaningful (mean odd adress).