Discuss issues related to Calculator Hacking/Modding.
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- Calculators: Casio fx-7400GII, Casio fx-7400GII (SH4), Casio fx-9750GII, Casio fx-9750GII (SH4), Casio fx-9860G, Casio fx-9860G SD, Casio fx-9860G Slim, Casio fx-9860GII SD, Casio fx-9860GII SD Power Graphic 2, Casio Classpad 330 plus, Casio fx-CG20, Casio fx-CG50, Casio Classpad fx-CP400
I think you have to remove the MAX233, too. Otherwise the MAX233's TTL-IO-lines would compete against the calculator's.Arkhs wrote:I was thinking about removing the db9 connector and soldering a 3pin female (connected to Rx, Tx and Gnd).
The TTL-specifications are: low:<=0.8V and high:>=2V.Arkhs wrote:...because it needs 3,3V (and it is also very large).
As the PIC can be interfaced by a MAX233, its signal levels are obviously TTL.
2.8V and 3.3V should make no difference concerning the signal-level.
I'll be back!
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