Is usage of expanded memory the only advantage that qb71...

[Touf]

has over 45?

You have more functions in 7.1 ... like ON LOCAL ERROR , etc .. and lots of useless functions ! lol

[na_th_an]

Can I make a SUB containing "SCREEN 13" compile it,
take the obj and use it with c++?

Nope. Mainly 'cause every QB function/command relies heavily on its runtime library.

[KingCheetah]

SCREEN 13 under C:


#define VIDEO_INT 0x10 /* the BIOS video interrupt. */
#define SET_MODE 0x00 /* BIOS function to set the video mode. */
#define VGA_256_COLOR_MODE 0x13 /* use to set 256-color mode. */
#define TEXT_MODE 0x03 /* use to set 80x25 text mode. */


void set_mode(byte mode)
{
union REGS regs;

regs.h.ah = SET_MODE;
regs.h.al = mode;
int86(VIDEO_INT, &regs, &regs);
}


This code will do it, then draw on the screen using the memory location A000

(A000:0000 - first pixel, A000:0001 - second pixel ...)