[V9990] Q&A Official Thread

Got it. I would still have one pallete for each layer, but I can select each layer's pallete from the four possible.

This probably means that I can change the used pallete on a line interruption. (I read that you got corrupted graphics if you change pallete colors during vertical retrace)

This would allow a nice effect like on Sega Mega Drive's Sonic Labirynth Zone (underwater pallete is different from outside water)

Thanks hit9918 and assembler.

a question: where can we find simple examples in pure interpreted msxbasic, without extensions, setting display modes and writing on the display ram area, only using i/o ports directly?

in one of the programs I wrote register like this

and in other places I did it without adding 128
I got no idea which is the right one

just a question: how vpoke works there? (using i/o ports on msxbasic)

thanks, in theory, and with some experimentation, i had some idea of that

i understood why that was not working, somehow that 256x256 "cls" was destroying it - when i removed that, or changing that to 256x212, the gosub 10000 started to work fine - i have no idea what caused that

now, there are two things i’m interested to know how to do in msxbasic:
- vdp commands - http://msxbanzai.tni.nl/v9990/manual.html#command has some documentation, but it looks confusing - it explains briefly what is used, but not specifically enough, which results quite painful to try to translate that into code (sorry saying that, guyver800, it’s the truth... :S - for now, lmmv, lmmc and lmmm seems the most needed )
- setting screen modes (seems a bit simpler, but i don’t know where to start - i wanted to try all screen modes - the confusing part is that the information at http://msxbanzai.tni.nl/v9990/manual.html#registersettings (using registers 6 and 7, and no idea what P#7 means) doesn’t look coincident with what is in the data lines in the msxbasic codes (using registers 6 and 8) )