The following units are standard and are meant to be ported to all platforms supported by Free
Pascal. A brief description of each unit is also given.
- A unit to provide mapping of character sets.
- Using this unit replaces the Free Pascal memory manager with the memory manager
of the C library.
- This unit is similar to the unit of the same name of Turbo Pascal. It implements writing
to the console in color, moving the text cursor around and reading from the keyboard.
- This unit provides basic routines for accessing the operating system. This includes file
searching, environment variables access, getting the operating system version, getting
and setting the system time. It is to note that some of these routines are duplicated in
functionality in the sysutils unit.
- Provides cross-platform access to loading dynamical libraries.
- This unit gives you the gnu getopts command line arguments handling
mechanism. It also supports long options.
- This unit is deprecated. This unit provides basic graphics handling, with routines to
draw lines on the screen, display text etc. It provides the same functions as the Turbo
- a unit which debugs the heap usage. When the program exits, it outputs a summary
of the used memory, and dumps a summary of unreleased memory blocks (if any). You
should not include this unit directly, instead use the -gh command-line switch.
- provides basic keyboard handling routines in a platform independent way, and
supports writing custom drivers.
- This unit implements several functions available only in MACPAS mode. This unit
should not be included; it’s automatically included when the MACPAS mode is used.
- This unit contains common mathematical routines (trigonometric functions,
logarithms, etc.) as well as more complex ones (summations of arrays, normalization
- A unit providing matrix manipulation routines.
- This unit provides support for mmx extensions in your code.
- Provides basic mouse handling routines in a platform independent way, and supports
writing custom drivers.
- This unit provides the base object for standard Turbo Pascal objects. It also
implements File and Memory stream objects, as well as sorted and non-sorted
collections, and string streams.
- Is used for Delphi compatibility. You should never load this unit explicitly; it is
automatically loaded if you request Delphi mode.
- This unit provides all you need for rudimentary access to the printer using standard
- This gives the programmer access to sockets and TCP/IP programming.
- This unit provides basic string handling routines for the pchar type, comparable to
similar routines in standard C libraries.
- This unit is available for all supported platforms. It includes among others, basic file
I/O routines, memory management routines, all compiler helper routines, and directory
- Offers a lot of extended string handling routines.
- Offers a lot of extended date/time handling routines for almost any date and time
- Is an alternative implementation of the sysutils unit of Delphi. It includes file I/O
access routines which takes care of file locking, date and string handling routines, file
search, date and string conversion routines.
- Provides functions to access runtime Type Information, just like Delphi.
- Provides basic variant handling.
- Provides basic screen handling in a platform independent way, and supports writing