Press the “release” levers on the edges of the CPU board to eject the card. (This can be very difficult if the card hasn’t been removed in 15 years…) The CPU card looks like this:

Locate the EPROM card (it should be the only card without any cables attached to the end). Press the release levers on the EPROM card and remove it as well. The EPROM card for different games will have different numbers of chips on it. It will look something like this:

Put the EPROM card somewhere safe. You won’t need it in your game anymore.

Sega G-80 Multigame, Version 1.0

Copyright © 1998, Clay Cowgill

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Sega G-80 instruction manual