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There are about 6 different versions of Atari Asteroids CPU boards and most of them call for different EPROM chip locations.
Asteroids CPU Ver. 2 & 4
| Chip Location | Markings | EPROM type |
| C1 | 143-01 or -02 | 2716 |
| D/E1 | 144-01 or -02 | 2716 |
| E/F1 | 145-01 or -02 | 2716 |
| N/P3 | 127-01 or -02 | 2716 |
Asteroids CPU Ver. 5 & 6
| Chip Location | Markings | EPROM Type |
| J2 | 143-01 or -02 | 2716 |
| F/H2 | 144-01 or -02 | 2716 |
| E/F2 | 145-01 or -02 | 2716 |
| N/P3 | 127-01 or -02 | 2716 |
Asteroids Deluxe. CPU Ver. 1-3
| Chip Location | Markings | EPROM Type |
| D1 | 036430-01 or -02 | 2716 |
| E/F1 | 036431-01 or -02 | 2716 |
| F/H1 | 036432-01 or -02 | 2716 |
| J1 | 036433-0* | 2716 |
| N/P2 | 036799-0** | 2716 |
| R2 | 036800-01 or -02 | 2716 |
There are a couple of different combinations that can be used for Asteroids Dlx. boards as listed below. To eliminate confusion you're best off to use all the same ROM version # for all EPROM chips.
* If you have ver. #2 ROM set installed in the rest of the locations this location (J1) needs to be ver #2 otherwise ver. 1 or 2 will work.
**If you have ver. #1 ROM set installed this location (N/P2) all ROMs also needs to be ver.#1 otherwise ver. 1 or 2 will work.