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- // Trident header file trident.h
- //
- // Contains class definitions for Trident 9440/96xx video boards
- //
- //
-
- // The following line denies outside code access to certain
- // member functions of class vga.
- #define __trident_h
- #include "vga.h"
- #include<dos.h>
-
- #define _NEW 1
- #define _OLD 0
-
-
- class _TR9440 : public vga { // Trident 9440AGi chipset
- protected:
- uchar old_SR0E; // preserve previous _SR0E
- double get_mclkfreq( void );
- // Get MCLK frequency from port IO register 0x43C6
- int read_mclk( void );
- // Read mclk-register into integer value
- public:
- message _info( void ); // Return chipID ( 0x3C4, index 0B )
- void _mclk( int cmd ); // MCLK programming function
- _TR9440( vga_info info ) : vga( info )
- { old_SR0E = read_SR( 0x0E );
- write_SR( 0x0E, 0xC2 ); // Unlock Trident SVGA
- };
-
- ~_TR9440()
- { write_SR ( 0x0E, old_SR0E ); // Restore register
- };
- };