[GreenKeys] USB-to-serial adapters, and baudot

[Randy McLaughlin]

From: "Bob Camp" <ham at cq.nu>
Sent: Monday, February 28, 2005 8:45 PM
> Hi
>
> The problem with "bit bang" parallel stuff these days is that Microsoft 
> has nuked that capability in 2000, ME, and XP. You need a custom parallel 
> port driver to get the bits out. Each time a service pack comes out things 
> get weird until the driver gets updated.
>
> It's actually easier to do the bit bang operation on the CTS/RTS lines on 
> the serial port. That way you already have the RS-232 level conversion 
> done as well.
>
> Take Care!
>
> Bob Camp
> KB8TQ
<snip>

There are already drivers to directly access the parallel port and the issue 
here is that there are some laptops with no serial ports.

Manually toggling USB to serial port pins might be doable, I've never tried.

There are also some cheap programable USB controllers (8052 based) that 
could be used.


Randy