Seems the Studio2 driver is broken in 0.168, actually seems to be that way for a few releases now.

Is this some known regression or just went unnoticed so far?

Works for me.

I used Space Invaders, it starts off a flickering mess, press F3, runs fine.

Trying different games loading from software list, I can't get anything to work or run.

Using F3 to clear after flickering running studio2 results in black screen. All the clones results in a blue screen.

What OS, is your os and/or the compile for 32/64bit, and if you compiled it yourself what compiler and compiler version did you use? (or is this the mamedev.org build)?

LN

I see it does work after pressing F3, but this wasn't the behavior before. Is it really supposed to require a reset before starting a game? I guess that could be possible (can't check any manual atm).

http://bitsavers.trailing-edge.com/pdf/rca/cosmac/RCA_STUDIO_II_Owners_Manual.pdf

Page 4
Getting ready to play
4. Press Studio II Console "Clear" button

Yeah just checked some games manuals as well, I guess that explains it then.

A few of the homebrew games created by Paul Robson seem to have graphical glitches or not work at all.

For instance Hockey has a lot of graphical problems and Pac-Man or Scramble doesn't seem to even start. All these work fine with Emma 02.

Have these ever been tested on real hardware? I know someone's working on a multi-cart, so if not, they may be tested soon.