Known Issues with DOSBox?

[Gablea]

Hi all,

Does anyone know of any issues with DOSBox when running DOS complied FreeBASIC applications?

I am getting a black screen and nothing else with my program :(

The program runs if I compile it for Windows

[Tourist Trap]

Hi,
I've used DosBox some years ago. There was a config file to edit and test befor anything could be displayed. So if it hadn't changed I'm not sure you will be able to run something before tuning your config properly. If you use virtualbox, I think you could plug a DOS system in?
It's what I tried to do then, but weren't able to find the Dos 6.22, and gave up.

[caseih]

I just fired up fbc 1.01 in DosBox and compiled a one-line hello world program and it ran fine. Haven't tried doing anything with graphics though.

[jdebord]

DosBox emulates a 16-bit system, no ? FBC is 32 or 64 bit.

[St_W]

DosBox emulates a 16-bit system, no ? FBC is 32 or 64 bit.

FBC generates 32-bit executables for DOS (using a "DOS extender"), but that's no problem for DosBox - if it wouldn't support that lots of old DOS games wouldn't work either because many used DOS extenders like DOS4GW.

[Gablea]

I just fired up fbc 1.01 in DosBox and compiled a one-line hello world program and it ran fine. Haven't tried doing anything with graphics though.

yes the application I am designing is a graphical app.

My plan text apps work fine in DOSBox

[caseih]

screen 12 seems to work fine in DOSBox.

[Gablea]

screen 12 seems to work fine in DOSBox.

I am using

Code: Select all

	ScreenControl( fb.SET_DRIVER_NAME, "GDI" )
	ScreenRes 800,600,32
        BackGround_Loading  = ImageCreate(800,600)
        BLoad ExePath & FileSeperator & "images" & FileSeperator & "bg_1.bmp", BackGround_Loading		'Loads the Background 

       ScreenLock
	        Cls
		Put (0,0), BackGround_Loading, PSet
	ScreenUnLock

and all I am getting is a black screen :(

[Tourist Trap]

Code: Select all

	ScreenControl( fb.SET_DRIVER_NAME, "GDI" )
	ScreenRes 800,600,  8      '<----- just for test
        BackGround_Loading  = ImageCreate(800,600, 15,  8)        '<-------init as blank screen 8 bits depth
        'BLoad ExePath & FileSeperator & "images" & FileSeperator & "bg_1.bmp", BackGround_Loading		Don't use for test

       ScreenLock    
	        Cls
		Put (0,0), BackGround_Loading, PSet
	ScreenUnLock  

Hi Gablea, I 'm not the most competent but I propose you do the tests above. It should draw a blank screen. Every thing is 8 bits and no BLOAD done to avoid difficulties there.

[marcov]

"gdI" is for dos programs running under Windows. Dosbox doesn't emulate windows, it is only dos.

[Gablea]

ok so under Normal DOS what do I use to set the screen?

[Tourist Trap]

ok so under Normal DOS what do I use to set the screen?

Maybe good old vga, hercules, svga, and so on? Why don't you open the config file that should contain every emulated material, like soundblaster and so on? Sorry, it's a long time I've not been on Dosbox but I quite remember you can have a lot of information from this file.

[RockTheSchock]

I compiled alllegro4 and cgui under dosbox and tested the cgui example with no problems. With other fb examples I had some weired problems. After setting DosBox Option from "cputype=auto" to "cputype=pentium_slow" there are no problems running several examples: flame.bas, tui.bas qbsprite.bas ....

EDIT:
Allegro took some hours to compile. CGUI just some minutes. ;-)