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This kit is based on the Rev2 version of Asteroids. If you have a Rev1 based Asteroids based game, you will need to upgrade the vector rom to Rev2. A Rev2 vector eprom is included with the kit at no extra charge. However it is suggested that you only install the vector eprom if you have a REV1 version. That is, "If it aint broke don't fix it". There are a couple of easy ways to identify if you have rev1 or rev2, the simplist is to look at the screen during attract mode. The bottom line will show either "ASTEROIDS BY ATARI" (rev1), or "© 1979 ATARI INC" (rev2). Another way is to look at the vector rom chip on the PCB at location N/P3. If the chip is labeled "035127.01", then it is (rev1), if it is labeled "035127.02", then it is (rev2). Rev1 Asteroids game will display "ASTEROIDS BY ATARI" at the bottom of the screen.
Rev2 Asteroids game will display "© 1979 ATARI INC" at the bottom of the screen.
If you have a Rev1 based Asteroids based game, you will need to upgrade the vector rom to Rev2.
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