G'day Rod,
 
 RG> Firstly, an RS232 cartridge is designed to take the C64/128's RS232
 RG> signals and convert the 0 - 5v signal levels to the "true" RS232
 RG> standard of +-12 volts. This is *all* it
 RG> does, and for speeds of 2400bps
 RG> or less this is all that is required (9600 for the C128).
 RG> Please note the ABSENCE of the RS232 driver card - The C64 doesn't
 RG> *need* this. It generates its OWN RS232 signals that simply need a
 RG> *voltage* conversion to drive the modem.
 RG> So why to C64ers "panic" when it is mentioned that they need an
 RG> "interface" to drive a modem ?  I dunno because the reality is they
 RG> don't even need one.
 RG> In fact (although not recommended) MOST
 RG> modems will work quite well on
 RG> the C64 without any form of "interface"
 RG> at all - these modems are quite
 RG> happy with the C64's  0-5v signal levels.
 RG> (If you don't believe me, try it)
The Modem might do OK with 0-5v but what comes out of the Modem back to
the computer  5v or 12v?
Reece.
 
 
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