>I'd like to convert the 3.3V signals into 5V levels for driving an RS232
>converter like the MAX202 (which I have in stock) and some other drivers
>for LEDs or LCD displays.  On the other side,  switches and keypads can
>pull down 3.3V inputs easily enough but for the above mentioned LCD
>displays a 5V to 4V buffer?  (Or are two resistors adequate for the most
>part?

Some converters such as the MAX3232E will do the 3.3V to rs232 for you. IIRC
this part is pin compatible to the 202.

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