I was more for Commodore at the time. But hey that was then 
Screenshots http://hatari.sourceforge.net/scrshots1.html
Best to read the documents about it
Very detailed./usr/share/doc/hatari
Background
Hatari is an Atari ST and STE emulator for Linux, BSD, BeOS, Mac OS X and other systems that are supported by the SDL library. The Atari ST was a 16/32 bit computer system which was first released by Atari in 1985. Using the Motorola 68000 CPU, it was a very popular computer having quite a lot of CPU power at that time. Unlike many other Atari ST emulators which try to give you a good environment for running GEM applications, Hatari tries to emulate the hardware of a ST as close as possible so that it is able to run most of the old ST games and demos. Hatari is open source software and is distributed under the terms of the GNU General Public License (GPL).
The SF project page is available at: http://sourceforge.net/projects/hatari/
Features:
Hatari supports the emulation of most of the ST and STE hardware, including some special tricks like raster interrupts, border effects and PSG sample sound. A joystick can be emulated with the cursor keys or with a real PC joystick. Hatari also features the possibility to "mount" a directory of the host system as a ST drive, or to use hard disk images with its ACSI emulation.
Note that Hatari mainly emulates the original ST and STE hardware – the emulation of the additional hardware of the TT or Falcon machines is currently in development and highly experimental.
System requirements:
First you need a fast (500MHz or more) machine running a Unix compatible OS (preferably Linux) which is supported by the SDL library. There are also some ports to other operating systems like BeOS, please see the links page for more information. Non-Linux systems like FreeBSD etc. are rarely tested, so if you run into problems while compiling Hatari on such platforms, please let us know!
Have a look at the downloads page for details about the required libraries and available packages. Some binary packages are now available, too, but not for all architectures. So you might need to also have GNU C on your system to recompile the source code of Hatari.
Before you can finally run the emulator, you also need a TOS image file. TOS is the built-in operating system of the Atari 16/32 bit computers. Since it is not possible to ship one of these image files with Hatari, you either have to create your own image from your Atari or you have to you EmuTOS, a free TOS replacement.
Certain versions of Hatari have successfully been tested by various people on the following systems:
* Linux 2.6.x is the prefered platform (most developers use this OS)
* Apple PowerMac with Mac OS X
* NetBSD 1.6
* NetBSD on a Digital Alpha
* FreeBSD 4.1 on a i486 computer, FreeBSD 4.8 on a Pentium 4 and FreeBSD 5.1
* OpenBSD 3.5
* Solaris 8 on a SUN UltraSparc 1 (64-bit mode)
* Sharp Zaurus SL-C760 PDA running Linux
* Nokia N770 / N800 internet tablet
* Acorn RISC OS machines
* Amiga OS 4
* FreeMiNT on Aranym
* Windows XP
* BeOS/i86
Needs SDL to run
http://www.puppylinux.ca/tpp/ttuuxxx/pr ... -1.2.9.pet
Download Below
Have fun ttuuxxx