Casio fx-890P

Serial number 7D308E, made in Japan
Accessories Protective plastic cover

Set of batteries

Operating Manual (Japanese), 112 pages, dated 1997
Technical data can be found on pg.106

Assembler Manual (Japanese), 126 pages, dated 1997

C, BASIC, and CASL Manual (Japanese), 344 pages, dated 1997

Original cardboard box

Casio RP-33 32kByte memory pack installed

3 sheets of paper copies containg BASIC listings of the card game "Speed" (by Adihsoy) and some sort of jump'n'run game called "Item Tower" (by Shogo.O)
Condition Nearly mint out of the box! Everything is in perfect condition except for the Operating Manual which has some bent ears.
Repairs, Comments
Acquired 30.1.2003
Type, Precision, Input mode Scientific, 10 BCD digits, exponent 99, Algebraic
Programmable Yes, in C, BASIC, CASL and assembler. The unit is one of the faster machines. Notably, it is 10 times as fast as the PB-2000C.
Also, it turns out that the BASIC interpreter is only slightly slower than the C-interpreter.
Both the C and BASIC interpreter use 13-digit BCD numbers internally. 
The normal calculator uses only 10 BCD-digits, though.
The C and BASIC languages are available all the time whereas on the PB-2000C installing the BASIC module will completely disable the C-interpreter.
At most there can be 10 different BASIC programs and 10 different C programs. However, CASL and assembler programs are stored in the C-program area so they reduce the number of available C programs.
Performance Index BASIC: 84, C: 93
Memory 64kByte internally + 32kByte memory module, permanent.
The maximum amount of supported RAM is 96kByte in total
Display 192x32 pixel black&white LCD, 32x4 characters 
Separate contrast adjustment knob on the right side of the unit
CPU X86-compatible 16-bit CPU 80L188EB
Special features Programmable in C, BASIC and assembler! A wide range of peripheral devices, see below.
Can be directly connected to another fx-890P unit using a serial interface.
Fast 16-bit CPU. Auto power-off; to turn on again press BRK.
Accessories See pg. 67 and 107 of the Operating Manual.
Part number Price (Yen) Price (€) Type
8 kByte RAM, see fx-730P.
32 kbyte RAM
Interface box and high density 3.5" floppy disk drive. 
Also available as MD-110.
Cable to connect directly to another fx-890P. 
Connector on the left side of the unit.
RS232 interface
RS232 plus centronics parallel interface
Interface box and printer. 
The printer can also be connected thru the FA-6
Unclear what this is, maybe an A4 plotter? 
See pg. 89 of the Operating Manual
AC power supply
Note: In 1997 one Yen corresponded to approximately 0.0083 Euro. See Oanda.
Original Pricing, Production Unknown, approx. 1997
Batteries 4xAA plus large button sized cell for backup. Or external DC 6V power supply.
To remove the AA cells or the backup battery a small switch must be slid to release the battery covers.
Dimensions Length 8.2cm, Width 20.7cm, Height 2.3cm
Links Connector pinout.
Comment A very interesting device! As far as I know it has never been released outside Japan. 
Surprisingly, it is much more similar to the Sharp PC-E500 than to the Casio fx-880P
However, it seems there are some similarities between the handbooks of the fx-880P and the fx-890P. This may be helpful to understand the BASIC interpreter and usage of peripherals.
Programming in BASIC and C is pretty straight-forward, see below. 
What CASL stands for be I don't know, maybe "C-Assembly-Language"?
One big drawback compared to the PB-2000C is the lack of a file system! A number of different C and BASIC programs can be maintained but apparently there is no way to create other types of files - neither text files with an editor nor data files from within a program.
In an email Omar noted in January 2009:
Actually there is [a way to create data files], but not using the “Open” command. Instead, you have to use the “Restore# (F0 to F9)” command. Then, you use “Read#” and “Write#” to interact with the file. The “Open” command does work but with the disk only “0:”.

There's almost no English language documentation available on the web.
Of course the most challenging fact is that all the manuals are exclusively in Japanese. Anybody who would like to practice his/her technical Japanese language skills is invited to take a look at these books!
Any other information on this unit would be highly appreciated as well.
Apparently, a very similar unit was sold under the name Z-1GR.
Programming in C Press the MENU key to the right of the LCD display and "3" to choose C language mode.
Use the left & right arrow keys to select one out of the 10 available programs.
"R", "L" and "S" keys execute, load (=precompile) or edit the selected program.
For the C-backslash "\" the Yen-symbol on the "I" key must be used.
To return from the editor to the C-language menu press shift-MENU.
Apparently, the fx-890 uses a C-interpreter similar the PB-2000C. The only obvious improvement is the added "const" keyword. And thanks to the 16-bit CPU the interpreter is quite fast, see Performance Index.
See also pg.14 of the "C, BASIC, and CASL Manual".
Programming in BASIC Press the MENU key to the right of the LCD display and "2" to choose BASIC language mode.
Press shift-P0 ... shift-P9 to select one out of the 10 available BASIC programs.
Enter "list" to list the entire program or for example "list 10-50" to display only parts of it.
Enter BASIC statements with a leading line number as needed. Note that there is no AUTO mode available which would automatically generate line numbers. Also, be aware that variable names are case sensitive!
Enter "run" to execute the program.
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