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Additional info for Turbo Pascal® version 7.0 programmer's reference
When DirectVideo is False, all characters are written through BIOS calls, which is a significantly slower process. DirectVideo always defaults to True. If, for some reason, you want characters displayed through BIOS calls, set DirectVideo to False at the beginning of your program and after each call to TextMode. See also CheckS now Chapter 7, Library reference 29 DiskFree function DiskFree function Purpose Declaration Dos, WinDos Returns the number of free bytes on a specified disk drive. function DiskFree(Drive: Byte): Longinti Remarks A Drive of Dindicates the default drive, 1 indicates drive Af 2 indicates Bf and so on.
LastMode returns to the last active text mode after using graphics. 0 compatibility TextMode CSeg function Purpose Declaration System Returns the current value of the CS register. function CSeg: Word; Remarks The result of type Word is the segment address of the code segment within which CSeg was called. DateTime type Purpose Declaration 26 Dos UnpackTime and PackTime use variables of DateTime type to examine and construct 4-:byte, packed date-and-time values for the GetFTime, SetFTime, FindFirst, and FindNext procedures.
See also EnvStr, GetEnv Example uses Dos i var I: Integeri begin for I := 1 to EnvCount do Writeln(EnvStr(I)) i end. EnvStr function Purpose Declaration Remarks Dos Returns a specified environment string. function EnvStr (Index: Integer): String i EnvStr returns a specified string from the DOS environment. The string EnvStr returns is of the form VAR= VALUE. The index of the first string is one. If Index is less than one or greater than EnvCount, EnvStr returns an empty string. For more information about the DOS environment, see your DOS manuals.