6.1.3) What were the CP/M Add-On module and 1090 XL Expansion System?

The Atari CP/M Add-On module (internally: Sweetpea, Sweet Pea, 1060) was shown
at the June 1983 Consumer Electronics Show in Chicago.  Housed in a case
resembling the 1050 disk drive, features were to include: Z-80 microprocessor
(4.0MHz Z-80A), 64KiB RAM, CP/M 2.2 operating system (by Digital Research;
supplied on diskettes for Atari disk drive), 80 column display capability
(composite video output port for high resolution monochrome display; unit
would also be able to use the Atari computer's display device in 40 or 80
column modes).  Electrical and firmware design licensed from Add-on Computer
Corp.  CP/M software applications supplied on diskettes formatted for Atari
disk drive (810 and 1050 formats both supported by the unit) were to be
marketed separately (catalog supplied in the box with the unit) by Add-on
Software, Inc., who expected to initially offer: Wordstar (MicroPro
International), dBASE II (Allied Computer Services), Peachpak (Peachtree
Software), Pascal/MT+ (Digital Research), CBASIC (Digital Research),
SuperWriter (Sorcim), SuperCalc (Sorcim), Multiplan (Microsoft), MBASIC
(Microsoft), and perhaps: MicroSort, Supersoft FORTH, Personal Pearl Database
Manager.  Atari confirmed the cancellation of the unshipped CP/M Add-On in
January 1984.  No more than a handful of prototype units may exist.
http://www.atarimuseum.com/computers/8BITS/XL/xlperipherals/1060/1060.html
https://archive.org/details/AddOnCPM

The Atari Expansion Box was first shown at the June 1983 Consumer Electronics
Show in Chicago.  Later dubbed the 1090 XL Expansion System, and intended to
replace the 850 interface, the 1090 would plug into the PBI on
600XL/800XL/1400XL/1450XLD computers to provide: two RS-232-C serial
input/output ports, one Centronics-type parallel output port, and five
internal 8-bit PBI card slots.  Three prototype XL Expansion Cards for the
1090 have been identified: the 1066 CP/M card (1090 card version of the CP/M
Add-On module), an 80-column video card (perhaps necessary for the 1066 CP/M
card to be usable), and a 64KiB RAM card that by June 1984 was promoted to
ship with the 1090. Atari continued to promote the 1090 through June 1984.  A
handful of prototypes exist, but the 1090 was never shipped.  Few if any
working prototype XL Expansion Cards for the 1090 exist.
http://www.atarimuseum.com/computers/8BITS/XL/xlperipherals/1090xl.html
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