[Coco] raspberry pi 3 model b to coco serial cable

[Mathieu Bouchard]

Le 2017-11-04 à 16:47:00, David Ladd a écrit :

> RS232 has ranges of -25V to +25V depending on the status of the bit.  Those
> kind of voltages would damage the Raspberry Pi's GPIO if you directly
> connected them to the CoCo's bitbanger without the level shifter.

In practice, which devices ever really used the full ±25V range instead of just 
±12V ?

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