QL2K wrote:
> Hi all,
>
> I asking to myself how to use second screen using Minerva mainly to check if
> QL2K works properly with this second
> screen.
> Can you please give me some details like SuperBasic commands to use this
> second screen ?
>
> Thanks in advance,
>
From the manual:
MODE now allows you to use both screens. The original one-parameter call
is exactly as before. The new form is:
MODE screen_mode,display type
Screen mode accepts the normal 4, 8, etc, but with a few additions (see
below). Display_type is simple, 0 for monitor, I for 625-line TV, and 2
for 525-line TV, or (usually) -ito leave the display type alone. Very
little software uses the display type record, as old versions of
SuperBASIC smashed it!
Screen_mode is very complex...
The two screens are known as ScreenO and Screeni. Each screen may be in
4-colour mode or 8-colour mode, or blank. Each job now has a "default"
screen on which any new windows will be opened - it can change this
default to have windows open in both screens. The screen which is not the
default for the current job (the one calling the new MODE) is the
"other" screen. Note that is is not necessarily the case that the
defaUlt screen for a job is the same one the user is looking at (the
displayed" screen).
Oh, and the user can’t necessarily see the displayed screen, it might be
blank. Your head hurt yet?
Toggling:
MODE 64+n, -1
toggles various attributes of the display, where:
n Toggles...
1 other screen from visible to blank
2 default screen from visible to blank
4 other screen from 4-colour to 8-colour
8 default screen from 4-colour to 8-colour
16 displayed screen from Screen0 to Screeni
32 default screen from Screen0 to Screeni
You can add together the various values for n to combine effects, so
n=12=8+4 will toggle the colour modes of both screens. Note: a change to
the default screen takes place before any of the others. Also, none of these
calls do the “forced re-draw” imposed by the one-parameter version of the
MODE call.
Setting:
MODE -16384+128+k*n+c, -1
sets or resets display attributes. The values of n are as above.
k Sets...
o ... to the “from” column above
1 ... to the “to” column above
257 toggles, as above
Values of k can’t be combined. The c portion controls which screen is force
re-drawn:
c Re-draws...
-16384 other screen
32768 default screen
You can add the c values to re-draw both screens.
So...
MODE 80, -1 toggles the “displayed” screen (80=64+16)
MODE 96, -1 makes subsequent VPENs happen on what was
the “other” screen (96=64+32)
MODE 112 ,-1. does both the above simultaneously
(112=64+32+16)
MODE 16560,-1 sets default to Screeni, displays it in 4-colour
mode, and force re-draws all windows in it
(16560=16384+128+1 (32+1 6)+32768)
Tony
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