Operating System: Atari's TOS with the Graphics Environment Manager (GEM) graphical user interface (GUI) TOS versions: 3.01, 3.05 or 3.06 in ROM. Four socketed 1 Mb ROMs providing 512 KB of ROM space. MiNT MagiC Atari System V NetBSD Display modes: Color: 320×200 (16 color), 320×480 (256 colors or 256 greyscales), 640×200 (4 colors), 640×480 (16 colors), palette of 4096 colors Duochrome: 640×400 (2 colors) Monochrome: 1280×960 mono TT high with ECL 19 in (483 mm) TTM195 monitor Character set: Atari ST character set, based on codepage 437. Case: Two-piece desktop-style. Release Date: 1990-1991 The (at least) two versions of the TT can be distinguished by: Internal sheet plate (old) or coating (new) for electromagnetic compatibility CPU and FPU on daughter board (old) or directly on main board (new) 1.44 MB HD floppy drive (720 KB DD floppy drive on older models) Emulation Hatari is able to emulate an Atari TT on a variety of different OS's using the SDL library. Atari Coldfire Project - Atari computer clone References External links Guillaume Tello's WEB page What to do with a TT? Some hardware expansions detailed Download page Programs for Atari, mostly for the TT. ASV Archive page Atari System V unofficial webpage. 68k-based computers Atari ST Computer workstations