INMC 80 News |
June/July/August 1980 · Issue 1 |
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The program to drive the game replaces the code using the keyboard exactly, apart from the delay routine which follows the end of the original coding.
The program executes from D00H, starting with PIO initialisation and then jumping to the original program.
| Locations | Routine | Description |
|---|---|---|
| CA9-CC0 | MLOOP | Scans the switches, will allow firing of a missile whilst moving left or right. |
| CC2-CD2 | FIRW | Fires a missile as per original program. |
| CD5-CE4 | T12 | Prevents more than one missile being fired |
| for each key depression. | ||
| CE6-CFC ) D0D-D20 ) | LEW | Move left, as per original program. |
| D00-D0A | START | Initialises PIO; Starts program. |
| D22-D4A | REW | Move right, as per original program. |
| FD2-FDE | SLOW | Controls speed of movement, by value at FD4 |
In principle, the ideas given above can be adapted to suit many games. The unit makes Space Invasion much easier to play and saves wear and tear on the keyboard when hitting the keys in the excitment of the game.
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