The Power of a Workstation
                    The New Atari TT Computer
 
 Premiering at the Dusseldorf Atari Fair, the TT, with the Motorola
MC68030 processor, moves the ST family into the 32 bit realm, achieving
a significant increase in computing power with full TOS compatibility. 
Our goal for the TT was to design an expandable computer that would
combine ST compatibility with superior resolution, more computing
power, and improved sound generating abilities.
 
The 68030 CPU
 
 At the heart of the TT is a 16 MHz MC68030 processor, which allows a
high degree of 68000 compatibility, while operating at a higher clock
speed and providing streamlined internal operations which make it even
faster.  The 68030 has built in 256 byte instruction and data caches,
and an internal Memory Management Unit.  Next to it on the board is a
socket for an optional math coprocessor (MC68881/MC68882).  Memory in
the TT is a full thirty-two bits wide, both the ST RAM which is shared
by the video logic, and TT RAM which is not shared.  These factors
combine to result in a memory bandwidth that is four times greater and
program execution speeds up to 17 times faster than on the ST. 
 
ST Compatible
 
 In both hardware and software, the TT is compatible with the ST.  All
hardware registers are in the same locations as they are in the ST. 
The ST video modes work the same way on both TT and ST, because they
are organized in memory the same way on both machines.  Most important
for ST compatibility is the operating system in the TT: TOS.  With TOS
as the TT operating system, existing programs can automatically use the
improved resolutions of the new video modes, as well as the larger
color palette, without any change to the software.  All this ST
compatibility has the obvious benefit of allowing TT owners to take
advantage of the large and growing base of ST software.
 
Graphics
 
 In addition to the three ST video modes, the TT has two new color
video modes available on its VGA monitor: 640 horizontal by 480
vertical resolution with 16 colors, 320 horizontal by 480 vertical
resolution with 256 colors.  With a high resolution monochrome monitor,
a 1280 by 960 resolution monochrome mode is available.  All the color
modes use a new, expanded 4096 color palette which is also available in
the ST modes.  Even ST monochrome (640x400) is actually a two color
mode on TT; we call it "duochrome."
 
Sound
 
 The improved sound system uses stereo 8-bit PCM (Pulse Code
Modulation).  This allows the TT to function as a digital tape player.
The hardware also includes an automatic variable low pass filter, a
stereo balance control and bass and treble tone controls.  This sound
is mixed through the internal speaker as well as being output via two
RCA phono jacks located on the back of the machine.  These features,
combined with the high power computing capabilities of the 16 MHz 68030,
allow the TT to produce a wide range of high quality sounds.
 
Interfaces
 
 In keeping with the design goal of expandability, the TT has all of
the ports familiar from the ST: MIDI, parallel, serial, and the Atari
ACSI DMA port (for Atari hard disks, laser printers, or CD-ROM).  The
TT also includes a 25 pin SCSI port.  One of the four TT serial ports
can be configured as an industry-standard medium-speed SDLC network
port.  Of course, the machine also provides an internal speaker, a
clock with battery backup, and a Mega ST compatible keyboard with ports
for mouse and joystick.
  
Expandable
 
 In addition to the expansion capabilities provided by the TT's
external interfaces, the TT is expandable internally as well.  The
housing can hold an internal hard disk and add-in memory cards.  These
memory cards allow the standard 2 megabyte TT to be expanded to 8
megabytes, or as much as 26 megabytes when 4Mbit DRAM chips become
available.
 
 Another example of internal expandability is the slot for a single
standard "Eurocard" style VME card.  This slot allows use of any of the
large number of existing VME expansion cards.  Some of the VME
expansion options currently available include memory expansion,
Ethernet and other network boards, coprocessors, graphics boards, and
data acquisition (A/D and D/A converters).  Already planned for TT VME
expansion are an Ethernet board for networking, I/O port expansion, and
graphics extensions.
 
UNIX Option
 
 The workstation-like capabilities of the TT will be complemented by an
optional industry standard operating system.  UNIX System V is being
ported for the TT.  Also available will be X windows as well as an X
windows based graphic user interface, giving TT owners all the benefits
of UNIX without all of the difficulties usually encountered.
 
TT at a Glance
 
 - ST compatible operating system, giving TT an extensive software library
 - ST compatible hardware, including all the ST interface ports
 - Three new graphics modes:
   1280 x 960 pixels high resolution monochrome
   640 x 480 pixels with 16 colors
   320 x 480 pixels with 256 colors
 - All color graphics modes use an expanded 4096 color palette
 - 16 Mhz Motorola MC68030 processor
 - Socket for optional MC68881/MC68882 math coprocessor
 - DMA with built in SCSI and ACSI ports
 - Two serial ports, expandable to four ports.
 - Parallel interface
 - Detachable keyboard
 - Internal "Eurocard" VME socket (A24/D16)
 - Internal hard disk option
 - 8 bit stereo PCM sound
 - 2 Mbytes RAM, expandable to 8 Mbytes (26 Mbytes with 4 Mb DRAM)
 - Real time clock with battery backup
 - Network capable hardware
 
 
 The Atari TT continues the Atari tradition of delivering
 Power Without The Price!
 
 We reserve the right to change technical specifications without notice.
 UNIX is a registered trademark of AT&T.
 
 August, 1989
 Atari Corporation
 1196 Borregas Ave.
 Sunnyvale, CA 94086