| 6K memory (internal) | Add 4K or 6K RAM internally. | Timex/Sinclair 1000 |
| CX81 Graphics Module | Create your own unique character set. Up to 32 characters for creating game pieces, musical notation, foreign alphabet. | Timex/Sinclair 1000 |
| Light Pen | Plug-on module with three modes: DRAW, ERASE, and CLEAR. Allows entering complex graphics by just touching the screen. Upper 90% of screen is free for graphics; lower portion divided into three zones for changing modes. Images stored in strings, can be saved to cassette. | Timex/Sinclair 1000 |
| RX81 Robotics Interface | Input/output board with 8 latched outputs (capable of driving an LED, transistor switch or relay) and 8 inputs (switched or TTL level). Can be used alone or with the Computer Continuum buffered expansion bus board for up to 32 simultaneous I/O lines. The RX81 was used in Bruce Taylor’s H.E.N.R.Y. robot, described in Robotics on | Timex/Sinclair 1000, Timex/Sinclair 2068 |
