In the emulator

With openMSX and the Philips_VG_8020 machine:

echo 2 > work/fase.txt
openmsx -machine Philips_VG_8020 -cart comicbakery.rom -script tools/omsx_partida.tcl

tools/omsx_partida.tcl:

• presses space in the menu and, when scene 5 sets the stage counter to zero (0x4193), writes the one in work/fase.txt into 0xE051, before the stage is set up;
• counts game frames with a breakpoint at 0x48CE and dumps RAM and VRAM on frames 1, 50, 200, 400, 800, 1200, 1600 and 2400, into work/partida/.

The demo goes through 0x48CE too, so the first dumps are of the demo, with the counter at 1.

A warning: if a breakpoint's command fails, openMSX freezes the emulation. The script wraps its commands in catch and logs the error in work/partida/log.txt.