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CASIO fx-7000G

Date of introduction:  October 1985 Display technology:  LCD dot matrix
New price:  $90.00 (SRP 1988) Display size:  8 * 16 characters
Size:  6.5" x 3.2" x 0.6"
 165 x 82 x 15 mm3
   
Weight:  5.4 ounces, 152 grams Serial No:  7D307A
Batteries:  3*CR2032 Date of manufacture:  year 1987
AC-Adapter:   Origin of manufacture:  Japan
Precision:  13 Integrated circuits:  CPU: NEC uPD1007G-008
 RAM: Toshiba TC5518
 Display: 2* Hitachi HD44351, HD44350
Memories:  26-78    
Program steps:  422-6 steps + 127 steps
 volatile
Courtesy of:  Joerg Woerner

fx-7000G_1.jpg (41336 Byte)It was a milestone in the history of pocket calculators when Casio introduced with the fx-7000G the world's first Graphing calculator. The display could be switched between the character mode offering 8 lines of 16 characters each, and a pure graphics mode with an array of 63*95 addressable dots. Even todays Graphing calculators like the TI-83 Plus kept this display format, main differences are the data and program memory sizes. Instead of limited 422 program steps todays calculators deal with megabyte instead the bytes.

fx-7000G_DSP2.jpg (44748 Byte)Dismantling the Casio fx-7000G and comparing with the later TI-81 reveals some surprises. The TI-81, introduced already 5 years later than the fx-7000G, uses almost identical hardware.

fx-7000G_PCB.jpg (69306 Byte)The main printed circuit board (PCB) of the fx-7000G with only two components: The application specific CPU uPD1007G-008 manufactured by NEC, probably based on a Z80 and a 2k*8 RAM. The later TI-81 uses a 8-bit microprocessor of the Z80 family, a huge ROM of 128k Byte capacity, and a RAM of 8k Byte size. 

 



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If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, February 28, 2004. No reprints without written permission.