The Integer BASIC firmware card was designed to supply Integer BASIC to Apple II+ owners. Both hardware and software can be used to supply Interger BASIC to the Apple II+.
Hardware
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The position of the switch on the rear of the card is used immediately after a system reset to force the selection of one of two banks of ROMs: the firmware card or the motherboard. If the switch is up then the system will default to Integer BASIC, otherwise the system will default to Applesoft.
Software
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By accessing address $C080, can select Integer BASIC, or, by accessing address $C081, Applesoft.
NOTE: For systems with Auto Start ROM, every time DOS gets control immediately after a reset, DOS forces a load of the version of BASIC DOS last used, regardless of the position of the switch.
Article Change History:
12 Feb 1997 - Reviewed for technical accuracy, revised formatting.