Re: Arduino virtual modem project

[Payton Byrd <plbyrd@gmail.com>]

On Tuesday, February 5, 2013 2:20:21 PM UTC-6, Payton Byrd wrote:
> On Tuesday, February 5, 2013 1:53:36 PM UTC-6, Steve Nickolas wrote:
> 
> > On Tue, 5 Feb 2013, Payton Byrd wrote:
> > > Just thought I'd pass along some news from the Commodore world.  I've 
> > > been working on virtual modem implemented as an Arduino sketch.  I have 
> > > the communications basically nailed down and am about to start the Hayes 
> > > command parsing.  Was wondering if anyone is interested in this project. 
> > > Right now it only uses TTL level serial as it's wired up to the 
> > > Commodore userport.  Does the A2 line work ok with TTL level serial, or 
> > > would I need to add a UART to bring the levels up to RS232 standard?
> 
> > Generally serial is implemented by a card containing a 6551, which I think 
> > is a UART.
> > -uso.
> 
> OK, found a suitable RS232 shield.

Just an update here.  The RS232 shields for the Arduino only supply Tx and Rx, not any of the control lines.  I've breadboarded a solution using MAX232 chips to do the level translations and have it working with the Turbo232 cart for the Commodore 64/128.  This should work fine with any computer with a standard RS232 interface!

I've begun documenting the circuit and design using Fritzing but I'm no EE and could use some assistance cleaning things up so a proper Arduino Mega shield could be created from my design.