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| How can I change the screen mode on an MSX2+?
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papa_november
msx novice
Berichten: 18 |  Geplaatst: 03 Februari 2008, 03:54 |
Is it possible to change the screen mode from 40 to 80 columns from within MSXDOS/BASIC? How about switching from NTSC to PAL?
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[D-Tail]
msx guru
Berichten: 2963 | Geplaatst: 03 Februari 2008, 04:51 |
40 to 80 columns in DOS: mode 40<return>
40 to 80 columns in BASIC: width 80<return>
NTSC to PAL in DOS: doesn't exist by default. Do BASIC<return>VDP(10)=2<return>_SYSTEM<return>
NTSC to PAL [actually, 60Hz to 50Hz, but wots the difference eh?  ] in BASIC: VDP(10)=2<return>
PAL to NTSC in DOS: doesn't exist by default. Do BASIC<return>VDP(10)=0<return>_SYSTEM<return>
PAL to NTSC in BASIC: VDP(10)=0<return> |
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Yukio
msx professional
Berichten: 722 | Geplaatst: 03 Februari 2008, 05:18 |
The difference is that Brazil uses PAL-M 60 hz mode ...
Also there is "NTSC with 50 hz" too!
For change the color signal someone would need to replace the crystal ...
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papa_november
msx novice
Berichten: 18 | Geplaatst: 03 Februari 2008, 06:09 |
Thanks guys!
I discovered that you have to type "SCREEN 0" before any of the 80/40 colum-related commands will work. I also found out that you can make the machine boot with the current settings every time using the SET SCREEN command- this has the side effect of also making DOS use 80 columns on startup.
Is there any way to create an AUTOEXEC.BAT entry to do the PAL/NTSC switch? Maybe have it run a tiny BASIC program that does it?
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[D-Tail]
msx guru
Berichten: 2963 | Geplaatst: 03 Februari 2008, 12:25 |
Well, you could e.g. search the web for a program 50HZ.COM/60HZ.COM, put these on your (hard)disk and call them from the AUTOEXEC.BAT. The problem is finding these tools. Maybe someone can come up with a small program for you.
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manuel
msx guru
Berichten: 3347 | Geplaatst: 03 Februari 2008, 13:46 |
or get BASIC.COM, a program that lets you execute basic statements in MSX-DOS. Make an autoexec.bat with: BASIC VDP(10)=VDP(10)OR2
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[D-Tail]
msx guru
Berichten: 2963 | Geplaatst: 03 Februari 2008, 19:08 |
@manuel: doesn't that have to be "BASIC.COM VDP(10)=VDP(10)OR2" then? BASIC is as far as I know a built-in statement to return to the BASIC interpreter.
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manuel
msx guru
Berichten: 3347 | Geplaatst: 03 Februari 2008, 23:51 |
oh, it's called "BASKOM", not "BASIC". (BASic KOMmando.)
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NYYRIKKI
msx master
Berichten: 1485 | Geplaatst: 04 Februari 2008, 10:02 |
Here is one solution... Type this on BASIC:
A$="F321E8FF7EEE0277D3993E89D399C9":FORI=0TO14:POKEI-14847,VAL("&H"+MID$(A$,I*2+1,2)):NEXT:BSAVE"HZ.COM",&HC600,&HC60F
... Now to change between 50/60Hz in DOS just type "HZ"
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