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Additional Pictures 

 

The backside of the early TI-Nspire CAS+ prototype looks similar to the released product but sports a strange color.

The 4 AAA-sized batteries of the TI-Nspire CAS+ prototype 
are accessible from the backside of the calculator. 

 

 We learned how to read the label of this early TI-Nspire CAS+ protoype:
Engineering Validation Test, Second Series, Serial #135.

The internal construction of the TI-Nspire CAS+ makes use of just 3 printed circuit boards (PCBs),
one for the gray-scale LC-Display and power supply, one for the computing unit and the keyboard. 

The frontside of the PCBs reveal the construction of the 240 * 320 pixel gray-scale
LC-Display, the TI-OMAP and a total of three different memory chips.  

The brain of the TI-Nspire CAS+ prototype is actually a System-on-Chip based on the OMAP architecture from 
Texas Instruments. We assume that the tiny housing hosts a 78 MHz ARM9 32-bit RISC processor. 

The TI-Nspire CAS+ uses three different memory chips, a 256k*16 NOR Flash-ROM, 32M Bytes NAND Flash-ROM,
and 16M*16 SDRAM. The clock frequency of the SoC is 12 MHz.

The 320 * 240 pixel gray-scale LC-Display needs a total of three drivers. 
We located this Novatek NT7702 row-driver.


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

Joerg Woerner, October 22, 2007. No reprints without written permission.