Jumper J1 on the Extended 80-Column Text Card enables the use of double high-resolution graphics on the Apple IIe Rev.B main logic board.
Changes to Extended 80-Column Card Instructions
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The instruction sheet that comes with the Extended 80-Column card states that a "small plastic jumper" should not be installed on the 80-Column card if the number on the back of any Apple IIe main circuit board ends in an "A".
This is incorrect. The jumper should always be installed on the 80-Column card UNLESS the number on the main circuit board ends in "...0064-A". Other than this instance, every Extended 80-Column Card should have the jumper installed.
Article Change History:
14 Nov 1996 - Reviewed for technical accuracy, revised formatting.