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You used to be able to buy budget version of Casio scientific calculator and use pencil to draw a wire on PCB to turn it into fx-991EX. The only thing missing b
by hbossy 4y ago
You used to be able to buy budget version of Casio scientific calculator and use pencil to draw a wire on PCB to turn it into fx-991EX. The only thing missing button labels.
- japanman425 4y agoI remember this!! Similar with the 9850G, could upgrade it to the GII with a slightly modified hardware