Unlike Turbo Pascal, it also has ongoing development and is more valuable for serious projects running in DOS.įor MS-DOS substitution (if you don't happen to have MS-DOS 6.22 somewhere): Free Pascal - *note* this is a 32-bit version, although there is a port for DOS development.Turbo Pascal version 5.5 - This is the software I'm actually using for these examples, and the compiler that most older documentation on the web will also support (generally).Emulation of serial devices is generally a weak point for these programs, so it may work easier if you work from a floppy boot of DOS, or on an older computer that is otherwise destined for the trash can because it is obsolete. The tools I'm using are all available for free (as in beer) and can be used in emulator software (like VMware or Bochs) to try these ideas out as well. That really doesn't matter so much for what we are dealing with here, and it is a good chance to see how we can directly manipulate the UART to get the full functionality of all aspects of the computer. All it really offers is basic access to the hard drive and a few minor utilities. Compared to modern operating systems like Linux, OS-X, or Windows, MS-DOS can hardly be called an operating system at all. While it is unlikely that you are going to be using MS-DOS for a major application, it is a good operating system to demonstrate a number of ideas related to software access of the 8250 UART and driver development. It is now time to build on everything that has been established so far.
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