> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Maarten
> ter Huurne
> Sent: Thursday, October 07, 1999 4:59 PM
> To: [EMAIL PROTECTED]
> Subject: RE: Intersplit
>
>
> On Thu, 07 Oct 1999, Frits Hilderink wrote:
>
> > I've seen demos that display screen 5, 7 en screen 12 at the same time.
>
> To get that impression on the screen, you don't actually have to change
> video mode. SCREEN 5 can be simulated in SCREEN 7 by doubling all pixels.
> SCREEN 12 is in fact not a screen mode, but SCREEN 8 + YJK. YJK can be
> enabled in any mode, although it's most useful in SCREEN 7 and 8.
>
> However, YJK does move the display 4 pixels to the right...
I didn't know about this shifting. The VDP does have to read 4 bytes first
before
it can determine the colors to display, that is in every YJK enabled mode.
This is because of the 12 bit base color that is spreadout over 4 bytes.
> I guess there is some internal buffer that converts normal pixel values to
> YJK colors.
Probably.
>
> In the FF7 Slide Show (on FutureDisk 35), I used the "set adjust" register
> to scroll the screen 4 pixels to the left during YJK, so that YJK and
> non-YJK pictures would both be centered.
Just send me the diskimage and I'll see what I can do about it.
>
> > Btw, it won't go out of sync with NLMSX...
>
> Do you mean it will display correctly or just that it won't hang?
Screen 0 has different timings than the other screens, in fact, one screen 0
line
is smaller than the other modes. See the V9938 Technical Databook for exact
timings.
One line in screen 0 (40 columns) is 40 * 6 pixels = 240 pixels. While this
is
256 pixels in the graphical modes.
I was just curious how the VDP would react on a splitscreen that displays
both screen 0
as wel as screen 7 or 12. But I do know that NLMSX displays both screen
modes
without any problem. Maybe it has some nasty side effects on a real MSX.
Frits
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