Clearly if a simulator does not support the features of the processor you are wishing to use then the simulator is not of much good to you. What I would recommend in these cases is for you to investigate getting an evaluation board that has your desired processor on board and run/test your code in a real live environment as opposed to a simulated environment.

Another consideration, if your not tied specifically to a 5V power supply, is to look at the Cygnal parts. They have parts like the C8051F020 for example that also have 2 serial ports but generally operate at 1 clock per cycle. This offers a speed of performance you do not get with the Dallas part and even though it does not have a dual data pointer there is really no need for it at 1 clock/cycle. The Cygnal parts also offer you a couple of other huge advantages, an eval board is a little over $100US, the eval kit comes with Keil tools that let you work in assembly language to your hearts content (The C is limited to 4K program), and the chips have onboard JTAG flash and full hardware debug support. With this setup you would have no need to work in a simulator environment.

Michael Karas