Hi!
24-Окт-2004 20:23 [EMAIL PROTECTED] (Joe Cosentino) wrote to "FreeDOS
Devel" <[EMAIL PROTECTED]>:
>> Ah, yes, I see: "Displays the maximum number of lines possible for the
>> monitor you are using" means set highest mode. This is very easy operation:
>> just select 8x8 font (INT10/1112 on EGA/VGA; on CGA you anyway can't change
>> count of lines).
JC> If you'd like to submit a code snippet Arkady, please do....
Pseudocode:
______________O\_/_________________________________\_/O______________
bool EVGApresent () {
/* To see if you are running on an EGA, use INT 10H 12H BL=10H.
If on return, BL>4 then the EGA BIOS is not present,
so you must be running on a CGA or MDA.
*/
call_int_10h (AH=12h, BL=10h);
return BL < 4;
}
if (sethighmode && EVGApresent ()) {
call_int_10h (AX=1112h, BL=0); /* activate 8x8 font */
}
_____________________________________________________________________
O/~\ /~\O
There may be useful to preserve current video state and restore it on exit.
In this case:
______________O\_/_________________________________\_/O______________
unsigned restoremode = 0;
if (sethighmode && EVGApresent ()) {
restoremode = (word FAR*) MK_FP (0, 485h);
if (restoremode <= 8) restoremode = 0x1112; /* 8x8 font */
else if (restoremode <= 14) restoremode = 0x1111; /* 8x14 font */
else restoremode = 0x1114; /* 8x16 font */
call_int_10h (AX=1112h, BL=0); /* activate 8x8 font */
}
....
onexit:
unsigned
if (restoremode != 0) {
call_int_10h (AX=restoremode, BL=0); /* reactivate previous font */
}
_____________________________________________________________________
O/~\ /~\O
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