Tag Archives: FT_PEEK

FT DOS/BIOS

Posted on by vivaclipper 
 FT_CHDIR()       Change the current directory
 FT_DEFAULT()     Retrieve and optionally change the current default drive
 FT_DOSVER()      Return the current DOS major and minor version as a string
 FT_DSKFREE()     Return the amount of available disk space
 FT_DSKSIZE()     Return the maximum capacity of a fixed disk
 FT_FLOPTST()     Test diskette drive status
 FT_HANDCNT()     Count number of available DOS (not network) file handles
 FT_INP()         Retrieve a byte from a specified I/O port
 FT_INT86()       Execute a software interrupt
 FT_ISPRINT()     Check printer status
 FT_ISSHARE()     Determine if DOS "Share" is installed
 FT_MKDIR()       Create a subdirectory
 FT_OUTP()        Write a byte to a specified I/O port
 FT_PEEK()        Retrieve a byte from a specified memory location.
 FT_POKE()        Write a byte to a specified memory location
 FT_REBOOT()      Force a warm or cold boot
 FT_RMDIR()       Delete a subdirectory
 FT_SETDATE()     Set the DOS system date
 FT_SETTIME()     Set the DOS system time
 FT_SYSMEM()      Determine the amount of conventional memory installed
 FT_TEMPFIL()     Create a file with a unique name

FT_POKE

Posted on by vivaclipper 
FT_POKE()
 Write a byte to a specified memory location

 Syntax

      FT_POKE( <nSegment>, <nOffset>, <nValue> ) -> lResult

 Arguments

     <nSegment> is the segment of the desired memory address.

     <nOffset>  is the offset of the desired memory address.

     <nValue>   is the value to write to the desired memory address.

 Returns

     <lResult> will be .T. if all parameters were valid and the function was
               able to write the desired byte.
     <lResult> will be .F. if invalid parameters were passed.

 Description

     Use this function if you have a need to change the value at a specific
     memory location.  The function will write the specified byte to the
     specified address.  The value must be passed as a numeric; if the byte
     you wish to use is stored as a character, use the Asc() function
     to convert it.

     This function was written for version 5.1 of MicroSoft C.  You may
     have to modify the source code to use another compiler.

 Examples

     FT_POKE( 0, 1047, 64)  // Turn CapsLock on

 Source: POKE.C

 Author: Ted Means

 

FT_PEEK

Posted on by vivaclipper 
FT_PEEK()
 Retrieve a byte from a specified memory location.
------------------------------------------------------------------------------

 Syntax

      FT_PEEK( <nSegment>, <nOffset> ) -> nValue

 Arguments

     <nSegment> is the segment of the desired memory address.

     <nOffset>  is the offset of the desired memory address.

 Returns

     <nValue> will be a value from 0 to 255 if all parameters were valid and
              the function was able to retrieve the desired byte.
     <nValue> will be -1 if invalid parameters were passed.

 Description

     Use this function if you have a need to examine a specific memory
     location.  The function will return the byte at the specified
     address as a numeric value.  If you need this value as a character,
     use the Chr() function to convert it.

     This function was written for version 5.1 of MicroSoft C.  You may
     have to modify the source code to use another compiler.

 Examples

     local nVMode := FT_PEEK( 0, 1097 )  // Get the current video mode

 Source: PEEK.C

 Author: Ted Means