I read recently that, when you're playing any game, there is some "multiple key combination" at Sony MSX1 computers that make stop their execution and goes to BASIC, where you can "scan" the memory finding sprites at vram, etc...

Please, did anybody knows this key combinations?

control+shift+code+graph should do the trick,
BUT
first you need to enable it with POKE &hFBB0,1
and then make sure the game does not disable interrupts,
nor stops calling the bios interrupt handler.

I think that's not only a sony-specific key combo, rather MSX specific. I think you mean the 'warm boot BASIC principle'. That is, poke &HFBB0,1 and you can press [CTRL]+[SHIFT]+[GRAPH]+/[KANA]. You will then be warped to BASIC, as if you pushed the reset button. The game (or whatever) contents remain intact in memory. Only the first two video pages (#00000 to #08000 I believe) are cleaned because BASIC needs some VRAM resources in screen 0

EDIT:
Seems someone was just before me

it switches to screen 0 normally, but if you keep the keys pressed longer it even kills of the screen 0 switch, so you're still in screen 5 or wherever..
I have no idea if all the VRAM is still preserved then, but who knows

I tried to hack Pentaro Odyssey 2 like that, but it didn't work. I stayed on screen 4 with all sorts of messed up sprites...

Maybe that's the reason indeed...

i used this keycombo a lot when coding stuff in kun basic. a normal ctrl+stop wont quit from a running block in turbo mode. the above combo did the trick, but i always needed to type screen 0 to be able to do something usefull..

Don't keep the keys pressed so long, dude
If you press them short enough, it will definitely switch back to screen 0.

ah well, np.. i mapped screen0:list to F4

I never knew that combo! sounds awesome