Frequently Asked FB Runtime Library Questions

FreeBASIC Runtime Library questions:

   - How do I play sound?
   - How do I access the serial ports?
   - How do I print?
   - How do I access the hardware ports?

FreeBASIC Runtime Library questions

 How do I play sound?
   Of the QB's sound keywords only BEEP is implemented in FB. 
   If PC speaker sound is required, it should be programmed using IN and 
   OUT. See the example in the OUT keyword for a replacement of SOUND. 
   There is a library called QBSound that allows to emulate qb's ability to 
   PLAY in the background tunes encoded in strings, it uses the soundcard's 
   synthesizer.
   If what's required is to play .wav or .mp3 files thru a soundcard, 
   external libraries as FMOD or BASS can be used in Linux and Windows. For 
   DOS see the DOS FAQ section.

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How do I access the serial ports?

   DOS
   See DOS FAQ section.

   Windows and Linux
   See Open Com.

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How do I print?
   FB supports character output to printer.
   To print graphics two approaches are possible:
   * Preprocess the graphics data, program the printer, and send the data 
     to it (see wikipedia.org/wiki/ESC/P). This is OS-portable but depends 
     on the printer model. The only way for DOS, see also DOS FAQ section.
   * In Windows and Linux there are specific API calls. This is not 
     OS-portable but the OS's printer driver makes it printer-independent.

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How do I access the hardware ports?

   INP, OUT and WAIT known from QB are implemented in FB.
   The GfxLib intercepts the calls to some VGA ports to emulate the widely 
   used QB's palette manipulation and vsync methods. So ports &H3DA, &H3C7, 
   &H3C8 and &H3C9 can't be accessed it GfxLib is used. All other ports are 
   accessible.
   No further tricks are required to use INP and OUT in Linux or DOS. For 
   the Windows version the required device driver is installed each first 
   time the program is run in a windows session; this requires 
   Administrator rights for this first run or the program will end with an 
   error. Note that accessing hardware ports by applications is not common 
   practice in Windows and Linux.

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See also
   * Compiler FAQ
   * Frequently Asked FreeBASIC Graphics Library Questions
and
   * Win32 related FAQ
   * DOS related FAQ

