1.11) What were the Atari 1400XL, 1450XLD, 65XEP, and 65XEM?

Atari publicly introduced or announced several computers in the tradition of
the 400/800/XL/XE series that ultimately never shipped.

The 1400XL was introduced by Atari, Inc. alongside the 600XL, 800XL, and
1450XLD at the June 1983 Summer Consumer Electronics Show in Chicago, and
promised to ship in September 1983.  Expected to replace the 1200XL, and
resembling the 1200XL in appearance, the 1400XL was to provide the features of
the 800XL plus a built-in 300 baud modem with ModemLink software and a built-
in speech synthesizer (Votrax SC-01).  Earlier internal names at Atari for the
1400XL: "1201", "1200XLT".
Prototype units exist, but the 1400XL never shipped.
http://www.atarimuseum.com/computers/8BITS/XL/1400xl/1400.html

The 1450XLD was introduced by Atari, Inc. alongside the 600XL, 800XL, and
1400XL at the June 1983 Summer Consumer Electronics Show in Chicago, and
originally promised to ship in October 1983.  The 1450XLD was to provide the
features of the 1400XL plus a built-in double sided, dual/enhanced density
260KiB 5.25" floppy disk drive, with expansion space for a second disk drive.
Atari continued to promote the 1450XLD through June 1984.  Earlier internal
names at Atari for the 1450XLD: "6402", "1250", "1251", "1200XLD", "1250XLD".
Later internal name: "1450XL".  Prototype units exist, but the 1450XLD never
shipped.  http://www.atarimuseum.com/computers/8BITS/XL/1450xld/1450xld.html

The 65XEP was introduced by Atari, Corp. alongside the 65XE and 130XE at the
January 1985 Winter Consumer Electronics Show in Las Vegas.  The portable
65XEP was to provide the features of the 65XE, plus built-in 5" monochrome CRT
display and 360KiB 3.5" disk drive.  The 65XEP never shipped, and possibly
only the single original mockup display prototype unit ever existed.
http://www.cyberroach.com/cyromag/14/DSCN3934.jpg

The 65XEM was announced (but not shown) by Atari, Corp. at the January 1985
Winter Consumer Electronics Show in Las Vegas.  The 65XEM was to provide the
features of the 65XE, plus advanced sound/voice synthesis capabilities thanks
to the addition of the AMY Sound Processor chip.  Eight voices giving rich
music giving the following features: (Page 6 #14 Mar/Apr 85)
- Digital sample rate in excess of 30kHz.  Over 60dB dynamic range.
- Fundamental Frequency Range of 4.8Hz to 7.8kHz -10 2/3 octaves.
- Fundamental Frequency Resolution of 1/64 semitones.
- Precise control of harmonic amplitudes.  64 harmonics. 
The 65XEM never shipped, and no more than a handful of prototype units may
exist.
http://www.atarimuseum.com/computers/8bits/xe/xe_protos/65xem.html
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