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34 lines
936 B
C
34 lines
936 B
C
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/* Apple 1 Header File */
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//The keyboard data register returns ASCII codes with the high bit set
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//These can be safely printed, since the display hardware ignores the high bit
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#define CR $8D //Carriage Return key code
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#define ESC $9B //Escape key code
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#define DEL $DF //Delete (Backspace) key code
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//Memory locations used by monitor program
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char* buffer = $0200 //Monitor Input Buffer
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//PIA 6820 Registers
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char* kbd = $D010 //Keyboard Data
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char* kbdcr = $D011 //Keyboard Control Register
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char* dsp = $D012 //Display Data
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char* dspcr = $D013 //Display Control Register
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#label exit $FF00 //Monitor Entry Point
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/*
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void echo(A) = $FFEF //Print Character in Accumulator
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void prbyte(A) = $FFDC //Print Accumulator as Hexadadecimal number
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void prhex(A) = $FFE5 //Print Low Nybble of Accumulator as Hex Digit
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*/
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#origin $0300 //$0200 through $02FF used as a string buffer
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/*
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#asm
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#endasm
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char getkey();
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*/
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