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Remove the F8 ROM from your Apple and note the orientation. This is a Dead Test ROM which performs RAM diagnostic tests for the Apple II computer. - Carefully install the diagnostic ROM in it's place taking care to get the orientation correct.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.