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Asteroids and Asteroids Deluxe ROM chip locations.


 

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.