Image | Item No. | Description |
| 3803-1 (Inv) | Robotics Invention System Upgrade Kit (1.5) 70 Parts, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9735-1 (Inv) | Robotics Discovery Set 387 Parts, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9736-1 (Inv) | Exploration Mars 155 Parts, 1 Gear, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9747-1 (Inv) | Robotics Invention System, Version 1.5 717 Parts, 1 Gear, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9748-1 (Inv) | Droid Developer Kit 657 Parts, 1 Gear, 1999 Catalog: Sets: MINDSTORMS: Star Wars |
| 9755-1 (Inv) | Temperature Sensor 1 Part, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9756-1 (Inv) | Rotation Sensor 1 Part, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9757-1 (Inv) | Touch Sensor with Cable 2 Parts, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9758-1 (Inv) | Light Sensor 9V 1 Part, 1999 Catalog: Sets: MINDSTORMS: RCX |
| 9790-1 (Inv) | ROBOLAB Team Challenge Set (Serial) 725 Parts, 2 Gear, 1999 Catalog: Sets: Educational & Dacta: MINDSTORMS: RCX |
| 9791-1 (Inv) | ROBOLAB Team Challenge Set (USB) 724 Parts, 2 Gear, 1999 Catalog: Sets: Educational & Dacta: MINDSTORMS: RCX |