This directory tree contains **system codes** and contains

| File | Docu | Comments |
| ---- | ---- | -------- |
| [blink.mac](blink.mac)   | [docu](blink.md)  | _blinking lights_ demo |
| [memclr.mac](memclr.mac) | [docu](memclr.md) | clear memory |
| [noboot.mac](noboot.mac) | [docu](noboot.md) | dummy boot block |