---
title: "General Concepts"
summary: "The kernels' general concepts"
---

# ASCII extension
noxos extends ascii to support special characters and commands.
The extension uses byte blocks in the following form:

```
+----------+----------------+-------------------------------+-----------+
| SHIFT IN | Length of Data | Data                          | SHIFT OUT |
| 1 byte   | 2 bytes        | +---------+-----------------+ | 1 byte    |
| 0x0F     |                | | Command | Additional Data | | 0x0E      |
|          |                | +---------+-----------------+ |           |
+----------+----------------+-------------------------------+-----------+

```

**Commands:**

| Name             | ID   | Data 1                                           | Data 2       | Data 3       | Data 3       | Status |
|------------------|------|--------------------------------------------------|--------------|--------------|--------------|--------|
| `clear`          | 0x00 |                                                  |              |              |              | N/A    |
| `cursor_move`    | 0x01 | direction (left: 0 / right: 1 / up: 2 / down: 3) | num          |              |              | N/A    |
| `cursor_set`     | 0x02 | X position                                       | Y position   |              |              | N/A    |
| `color_set`      | 0x03 | Red                                              | Green        | Blue         |              | N/A    |
| `color_reset`    | 0x04 |                                                  |              |              |              | N/A    |
| `render_disable` | 0x05 | X position 1                                     | Y position 1 | X position 2 | Y position 2 | N/A    |
| `render_enable`  | 0x06 | X position 1                                     | Y position 1 | X position 2 | Y position 2 | N/A    |
| `keyboard_echo`  | 0x07 | status (enable: 0 / disable: 1)                  |              |              |              | N/A    |