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UNABLE TO EXECUTE BASIC.SYSTEM” – Why do I get this message when I boot a ProDOS disk?

April 26, 2017boot disk execute message prodos

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UNABLE TO EXECUTE BASIC.SYSTEM” – Why do I get this message when I boot a ProDOS disk?

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BASIC.SYSTEM has been loaded; but, startup code has detected one of two conditions: o- It did not find a $4C at $E000 (which it takes to mean Integer BASIC may be installed). o- It did not find at least 64K of RAM. The usual reason for getting this error message is that ProDOS with BASIC.SYSTEM has been booted on a 48K or smaller Apple II; or, the Apple II has a faulty Language Card (try re-seating IC’s on the card).