1964 Antique MODEM Live Demo

[Alexandre Souza]

>> I know there are "FTDI"-based USB seriual converters which would
>> presumably also have either an external MAXnnn or a bunch of discretes
>> for a charge-pump and level conversion, but I haven't dismantled any
>> of those.
>   The FTDI USB-interfaced UART that I've designed with, the FT232BM,
> does not have on-chip level conversion.  My design used a MAX232
> powered from the system power supply.  (the unit was not powered from
> USB)

    Small tip here:

    The FT-232 chip is a hell of expensive. Buy an old NOKIA data cable (one 
with the fun port connector) or like (siemens, maxom, any very old data 
cable) for $1 and you have the USB-to-TTL-Serial(needs max-232 to be a full 
usb to rs-232 cable) for a cheap.

    I do it everyday here.

    Greetz from Brazil, PU1BZZ Alexandre