[GreenKeys] RS232 to TTY Loop Boards

[Eric]

On 02/16/2015 2:42 pm, tony.podrasky wrote:
> GA OMs;
> 
> OK - I've spent part of the day in never-never land, wondering
> WHY a program was written to convert Upper Side Band (USB)
> into Teletype stuff...  :-)
> 
> Now, that I'm on the same page as you guys, isn't the USB UAR/T
> the same as regular UAR/Ts?
> 
> The ones in all my laptops and towers (running under Linux) are
> able to take a clock divisor and run the UAR/T at any speed
> within it's programmable range.
> 

Yes - that's the problem - on a lot of chips, the clock just can't
be programmed to go that slow. For instance on the chip I tried last,
you need to have the CPU clock at 16mhz for the USB bus to work right,
but the serial UART divisors can't be set high enough to divide this
down to 45 baud.

eric