Dreamcast games slow
I have tried two or three games. One of them, which is virtual tenis 1 or 2 is slow. I have also tried all modes of overclock and is even worst. I have the PI 3 B+
Virtua Tennis - Sega Professional Tennis (Europe) (En,Fr,De,Es Has Issues (VERSION USA replay pas visible) RPI3@1300MHZ CDI and gdi Virtua Tennis 2 - Sega Professional Tennis (Europe) (En,Fr,De,Es) Has Issues Fonctionne plutôt bien avec QQ bug graphique niveau 2D, rpi3 overclock @1350mhz mais au bout de quelques minutes retour dans recalbox
i have also tried with the USA version but the issues are the same. Slow, even more when using overclock.
Some people seems to make it working fine, I don't know how.
To me, using gdi, Virtua Tennis 1 and 2 have slowdows that makes it unplayable.
Simple overclock of the cpu is not enough to handle the dreamcast.
With some custom overclock settings I managed to run Virtua Tennis 2 around 90-95% of its full speed with very few minor glitchs. So the game is playable and enjoyable.
A lot of games are close to work at full speed, if only the pi3 have had a bit more cpu speed.
Every pi are different, so if it crashes or displays a black screen, you must lower some values (see the range in my config.txt below).
WARNING: you REALLY need a good cooling setup (fan + heatsinks) if you don't want to grill your pi.
My settings works for me and my pi3 can stay on for hours, BUT I can not be held responsible if your pi goes down.
In config.txt of the sdcard (plug it in your computer), here are my settings:
#old extrem default values
#my custom overclock: cpu / gpu (core & gpu freq should be equals) / sdram / voltage
#core_freq & gpu_freq (500-575)
#v3d_freq (520-530) or more ? under 500 is not enough for the dreamcast
More significant values are cpu, core_freq and v3d_freq.
Hope this help.
If anyone has a more powerful & stable setup, please share :)