Some questions about the use or register #9 while in screen 4
(the pattern based mode where tiles are the same of screen 2 but sprites are MSX2)

From the manual: bit 2 (EO) should be used for alternating pages in graphic modes from 4 to 7
Q1
Does it work in pattern mode ? (i.e. screen 4)
Q2
In which units is computed the time in register #13 (whose nibbles should count the display time of the two alternated pages)

From the manual: bit 3 (IL) should enable interlace, in particular:
setting both IL and EO you get that the the even and the odd pages are displayed in the first and in the second field of the image respectively
setting IL and resetting EO, you get that you should display the first and the second field in the same even page.

Q3
Does it work in pattern mode ? (i.e. screen 4)
Q4
If yes, is just the PNT to be swapped ?


My idea is again to try to improve screen 4 in order to add more than 2 colors per line.
Having 2 alternating pages in screen 4 could allow this result (at cost of flickering)

If someone has real HW to see how things go...

This one I can answer:

Quote:

From the manual: bit 2 (EO) should be used for alternating pages in graphic modes from 4 to 7 Q1 - Does it work in pattern mode ? (i.e. screen 4)

Nope, it works on graphic mode 4 -> 7, which is on screens 5->8 (on MSX2+ and above 5 -> 12)

So, SETPAGE on BIOS doesn't work... setting the bits directly, I think it doesn't either, but who knows

@SLotman
Have you tested on a real HW ?
It could be done by setting the vdp(10) in a basic program that just plot some crap in screen 4