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excell lt386sx - missing file

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First post, by goostaw

Posted on 
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hi

I need help.

The case concerns a 1990 laptop - Commax Excell lt-386sx.
Built-in vga graphics card is Cirrus Logic 510/520.
Laptop seems to be fully functional now, but....

I can not switch between the built-in screen and the external monitor.
In bios settings there is no such option. I did not find any combination of keys that would work.
I searched the internet and found an article ( August '91 "PC Magazine" ) from which it appears that the manufacturer added an application that changed the working modes - also switching internal/external monitor.
The utility is probably called 'switcher.com'
I tried the 'eagle.com' application, but it requires a video bios in minimal version 3 (here is 2.22)and program does not start.

Maybe someone has such or similar computer model and this program ( probably switcher.com )
I will be grateful for any information.

Reply 1 of 1, by goostaw

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I did not find the program, so I wrote it myself.
Maybe someone will use it. 😊

#include <dos.h>
#include <stdio.h>

main( )
{
	union REGS inregs, outregs;
	int a;
	printf( "i - internal LCD\ne - external monitor\nq - quit\n" );
	do a = getch();
	while ( a != 'i' && a != 'e' && a != 'q' );
	if ( a != 'q' )
	{
		if ( a == 'i' ) inregs.h.al = 0x00;
		else inregs.h.al = 0x01;

		inregs.h.ah = 0x12;
		inregs.h.bl = 0x92;
		int86(0x10, &inregs, &outregs);
	}
	return 0;
}

Regards

Attachments

  • Filename
    commax_sw.zip
    File size
    7.62 KiB
    Downloads
    34 downloads
    File license
    Fair use/fair dealing exception
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