Getting Started

This section describes how to use IC on the 6.270 board using the MIT Athena computer network.

Add the 6.270 directory to the execution path. Type the following command at the Unix prompt:
```
add 6.270
```
Plug the board into the computer. Connect a modular phone cable between the board and the host computer. The connection at the host end depends on the type of the host. Before the board is turned on, check that the board's green LED (labelled ser rcv) is lit. If it is not lit, there is a problem with the connection.
Initialize the board. The first step is using IC is to load the run-time module (called the "p-code program") into the board. If the p-code is already loaded, this step may be skipped. If not:
- Switch the board on. Hold down the CHOOSE button while hitting the reset button. The yellow LED (labelled ser xmit) should turn off. If the yellow LED is lit, the board is not ready to be initialized -- try again.
- From the Unix prompt, type
```
init_bd
```
  A process should begin that downloads the p-code program to the board. This will take about 15 to 30 seconds to complete. If the program exits with an error message, check the connection and try again.
Reset the board. Press the reset button on the board to reset it. The following should happen:
1. The board will emit a brief beep;
2. A version message will be printed on the LCD screen (e.g., "IC vX.XX");
3. The yellow LED will turn on brightly.
If these things do not happen, repeat step3 to initialize the board.
Begin IC. From the Unix prompt, type:
```
ic
```

At this point, IC will boot, ready to load a C program or evaluate expressions typed to the IC prompt.