Casio Cassiopeia
Casio Cassiopeia was the brand name of a PDA manufactured by Casio. It used Windows CE as the Operating system. Casio was one of the first manufacturers of PDAs, developing at the beginning small pocket-sized computers with keyboards and grayscale displays and subsequently moving to smaller units in response to customer demand.

Cassiopeia A-10, A-11 and A-11+
 Operating system: Microsoft Windows CE 1.0 Handheld PC edition
 Size: 175 mm x 92 mm x 26.5 mm :: 380 g
 CPU: Hitachi SH-3 at 44 MHz
 Memory: RAM 2 MB and ROM 4 MB
 Display: FSTN LCD, 480 x 240 Pixel, 4 shades of gray
 Interface: Serial and IrDA (ver. 1.0)
 Expansion slot: PC card Type II 
 Battery: 2x AA, up to 20 hours of running time; CR2032 for memory protection 
 Input: Keyboard and Touch Screen
 Extras: Speaker
 1997 Feb

Cassiopeia A-20, A-21S, A-22T, A-23G
 Operating system: Microsoft Windows CE 2.0 Handheld PC edition
 Size: 185 mm x 94 mm x 24.5 mm :: 430 g
 CPU: Hitachi SH3 at 80 MHz
 Memory: RAM 8 MB and ROM 8 MB
 Display: FSTN LCD, 640 x 240 Pixel, 4 shades of gray
 Interface: Serial and IrDA (Infrared) (ver. 1.0)
 Expansion slots: CompactFlash Type I and PC card Type II 
 Battery: 2x AA,(And rechargeable battery pack) up to 25 hours of running time; CR2032 for memory protection 
 Input: Keyboard and Touch Screen
 Extras: Speaker, Microphone
 1999 May

It was quickly discovered that most consumers wanted smaller devices, so the Palm-size PCs were developed. Japanese models of these units differ in both model number as well as appearance. The E-5x and/or E-5xx models are Japanese versions, colored blue instead of silver. The following versions were developed; A21-S for Student, A22-T for Teachers, A-23G for German with AZERTY keyboard, A-20F for French.

Cassiopeia A-50, A-51, A-55 and A-60
 Operating system: Microsoft Windows CE 1.01 and 2.0 Handheld PC edition
 Size: 185 mm x 94 mm x 24.5 mm 
 CPU: Hitachi SH3 at 80 MHz
 Memory: RAM 4 or 8 MB and ROM 8 MB
 Display: FSTN LCD, 480 x 240 Pixel, 4 shades of gray
 Interface: Serial and IrDA (Infrared) (ver. 1.0)
 Expansion slots: CompactFlash Type I and PC card Type II 
 Battery: 2x AA,(And rechargeable battery pack) up to 25 hours of running time; CR2032 for memory protection 
 Input: Keyboard and Touch Screen
 Extras: Speaker, Microphone

Cassiopeia E-10
 Operating system: Microsoft Windows CE 2.01 Palm-size PC edition
 Size: 80 mm x 120 mm x 20 mm :: 184 g
 CPU: NEC VR4111 MIPS at 69 MHz
 Memory: RAM 4 MB and ROM 8 MB
 Display: FSTN LCD, 240 x 320 Pixel, 4 shades of gray
 Interface: Serial and IrDA (ver. 1.0)
 Expansion slots: CompactFlash Type I and II
 Battery 2x AAA, up to 25 hours of running time; CR2016 for memory protection 
 Input: Touch Screen, Microphone, 4 user-configurable buttons and a control pad
 Extras: Speaker and Stereo 3.5 mm headphone jack

Cassiopeia E-11
 Operating system: Microsoft Windows CE 2.01 Palm-size PC edition
 Size: 80 mm x 120 mm x 20 mm :: 184 g
 CPU: NEC VR4111 MIPS at 69 MHz
 Memory: RAM 8 MB and ROM 8 MB
 Display: FSTN LCD, 240 x 320 Pixel, 4 shades of gray
 Interface: Serial and IrDA (ver. 1.0)
 Expansion slots: CompactFlash Type I and II
 Battery 2x AAA, up to 25 hours of running time; CR2016 for memory protection 
 Input: Touch Screen, Microphone, 4 user-configurable buttons and a control pad
 Extras: Speaker and Stereo 3.5 mm headphone jack
 1998 Sep

Cassiopeia E-15
The Cassiopeia E-15 was the last model of Palm-size PC introduced by Casio that used a grayscale display. It appeared at the same time as the E-105, and functioned identically to that device, except for the screen.

 Operating system: Microsoft Windows CE 2.11 Palm-size PC edition
 Size: 127 mm x 80 mm x 15.2 mm :: 190 g
 CPU: NEC VR4111 MIPS at 69 MHz
 Memory: RAM 16 MB and ROM 16 MB
 Display: FSTN LCD, 240 x 320 Pixel, 16 shades of gray
 Interface: Serial and IrDA (ver. 1.0)
 Expansion slots: CompactFlash Type I and II
 Battery 2x AAA rechargeable, up to 25 hours of running time; CR2032 for memory protection 
 Input: Touch Screen, Microphone, 3 user-configurable buttons, a control pad
 Extras: Speaker and Stereo 3.5 mm headphone jack

Cassiopeia E-100
The first Palm-size PC model by Casio to have a color screen, the E-100 was outwardly identical to the E-15.

 Operating system: Microsoft Windows CE 2.11 Palm-size PC edition
 Size: 81.2 mm x 132 mm x 20.1 mm :: 255 g
 CPU: NEC VR4121 MIPS at 131 MHz
 Memory: RAM 16 MB and ROM 16 MB
 Display: HAST LCD, 240 x 320 Pixel, 65536 colors
 Interface: Serial and IrDA (ver. 1.0)
 Expansion slots: CompactFlash Type I and II
 Battery: Li-Ion rechargeable, up to 6 hours of running time; CR2032 for memory protection 
 Input: Touch Screen, Microphone, 3 user-configurable buttons, a control pad.
 Extras: Speaker and Stereo 3.5 mm headphone jack

Cassiopeia E-105

 Operating system: Microsoft Windows CE 2.11 Palm-size PC edition
 Size: 81.2 mm x 132 mm x 20.1 mm :: 255 g
 CPU: NEC VR4121 MIPS at 131 MHz
 Memory: RAM 32 MB and ROM 16 MB
 Display: HAST LCD, 240 x 320 Pixel, 65536 colors
 Interface: Serial and IrDA (ver. 1.0)
 Expansion slots: CompactFlash Type I and II
 Battery: Li-Ion rechargeable, up to 6 hours of running time; CR2032 for memory protection 
 Input: Touch Screen, Microphone, 3 user-configurable buttons, a control pad.
 Extras: Speaker and Stereo 3.5 mm headphone jack

Cassiopeia E-115
 Operating system: Microsoft Windows CE 3.0 PocketPC edition
 Size: 81.2 mm x 132 mm x 20.1 mm :: 256 g
 CPU: NEC VR4121 MIPS at 131 MHz
 Memory: RAM 32 MB and ROM 16 MB
 Display: HAST LCD, 240 x 320 Pixel, 65536 colors
 Interface: Serial and IrDA (ver. 1.2)
 Expansion slots: CompactFlash Type I and II
 Battery: Li-Ion rechargeable, up to 6 hours of running time; CR2032 for memory protection 
 Input: Touch Screen, Microphone, 3 user-configurable buttons, a control pad.
 Extras: Speaker and Stereo 3.5 mm headphone jack

Casio always advertised the fact that their devices could be updated. Casio decided it would not issue an update for the E-100 and E-105, and a lot of owners of the devices complained. Because of the complaints, Casio offered to update the devices to the newest version of the Operating system if the owners sent in the device and paid a fee. Since the operating system was stored in ROM and not flash memory, the only way to upgrade was by replacing the ROM.

Cassiopeia E-125
 Operating system: Microsoft Windows CE 3.0 PocketPC edition
 Size: 81.2 mm x 132 mm x 20.1 mm :: 256 g
 CPU: NEC VR4122 MIPS at 150 MHz
 Memory: RAM 32 MB and ROM 16 MB
 Display: HAST LCD, 240 x 320 Pixel, 65536 colors
 Interface: Serial/USB and IrDA (ver. 1.2)
 Expansion slots: CompactFlash Type I and II
 Battery: Li-Ion rechargeable, up to 6 hours of running time; CR2032 for memory protection 
 Input: Touch Screen, Microphone, 3 user-configurable buttons, a control pad.
 Extras: Speaker and Stereo 3.5 mm headphone jack

After using the MIPS processor in the E-15 and the E-1xx series devices, the E-200 switched over to the StrongARM CPU, in keeping with Microsoft's specifications.

Cassiopeia E-200
 Operating system: Microsoft PocketPC 2002
 Size: 82 mm x 130 mm x 17.5 mm :: 190 g
 CPU: Intel StrongARM 1110 at 206 MHz
 Memory: RAM 64 MB and ROM 32 MB
 Display: TFT, 240 x 320 Pixel, 65536 colors
 Interface: Serial/USB and IrDA (ver. 1.2)
 Expansion slots: SD-Card (MultiMediaCard) and CompactFlash Type I and II as well as PC card via an extension module
 Battery: Li-Ion rechargeable, up to 12 hours of running time CR2032 for memory protection 
 Input: Touch Screen, Microphone, 3 user-configurable buttons, a control pad.
 Extras: Speaker and Stereo 3.5mm headphone jack
 2001 Dec

Successors of the Cassiopeia E-200
After experiencing difficulties in the market following the release of the E-200, Casio decided not to produce any further units for the US and European markets, instead focusing on the Japanese market. Some Japanese-only models are the Cassiopeia E-3000, using the PocketPC 2002 operating system, and the DT-10 with Windows Mobile 2003.

Other Models
C120/C140/C120+ are Compaq-branded equivalents to the Cassiopeia A-10/A-11/A-10+.
E-55 Japanese version of the E-15
E-707 Japanese model with wireless/phone antenna and both SD and CF card slots.
E-5xx Japanese versions of the E-1xx models.
EM-500 USA model, slightly smaller than the USA E-1xx with 16MB RAM and came in multiple colors.
E-700 Japanese version of the EM-500, but with 32MB RAM and came in many additional colors like white, carbon, silver.
E-750 Japanese successor to the E-1xx series with 32MB RAM and a 200 MHz MIPS CPU.
E-3000/3100 Later Japanese model with 400 MHz XSCALE CPU and CF + SD card slots. 3000/3100 ran PPC/CE.NET respectively.
SX-45 designed in cooperation with Siemens, this is a Cellphone integrated with an E-125.
BE-300 Pocket Manager (not a Pocket PC) running on Windows CE 3.0 with a Casio-designed user interface.  Released in 2001.
PA-2400W  (SH3 80 MHz, 8 MB RAM, 16 MB ROM, 480 x 240 4-level grayscale touchscreen, Windows CE 2.11)
IT-10 M20 from 2005 Rugged (IP54 Rated) Windows Mobile 2003/2 416MHz Intel PXA270 (800 MIPS at 624 MHz) 64MB RAM, 64MB ROM 3.7" VGA Transflective (640 x 480 TFT, 65536 colours) screen with 2,300 mAh Lithium Ion battery (up to 27 hours use) & CompactFlash and SDIO slots

References

External links 
 http://www.casio-europe.com
 https://web.archive.org/web/20070318005113/http://casio.jp/cassiopeia/

Casio personal digital assistants
Personal digital assistants
Windows CE devices
Windows Mobile Classic devices
Windows Mobile Professional devices