Nbzwt (Zweb on omnimaga) recently works on the ArithMax EV2, a DIY calculator based on hi-performance STM32F2 microcontrolle.
So many DIY calculators appeared, but most of them have no keyboard, let alone going into mass production.
But this time, things are different! ArithMax will have a keyboard, and we have a plan to put it into production!
BASIC INFORMATION
CPU:i.MX233 ARM9 from Freescale @ <=454MHz
RAM:DDR333 64MB HY5DU121622D 16bit
ROM:?
Screen:2.6'' 640*480 307ppi resistence screen 200nit TD026TTEA1 LTPS TFT LCD
Keyboard:支持外部连接8*8矩阵键盘或通过i2c、spi总线连接键盘。(Professional terms, don't know how to translate
)
Samples supporting the keyboard frome fx-82es plus and nspire touchpad.
IO:SJTAG,Serial Port, video output, TF card, USB
JOIN US:
https://github.com/nbzwt/ArithMaxREAD MORE:
http://zweb.clanmark.com/http://www.cncalc.org/forum.php?mod=viewthread&tid=9435