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46 lines
1.2 KiB
Plaintext
46 lines
1.2 KiB
Plaintext
; Copyright 2018 David Schmidt. All Rights Reserved.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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;
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; Adapted from Apple /// reference materials
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;
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*SYNOPSIS Symbols from hardware I/O areas
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KBD @ $C000 ;last key pressed
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KBDFLG @ $C008 ;
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KBDSTRB @ $C010 ;RW keyboard strobe
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SPKR @ $C030 ;RW toggle speaker (Apple II type)
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SPKRIII @ $C040 ;RW beeps speaker (Apple /// type)
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JOYRDY @ $C066 ;
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CLOCK @ $C070 ;clock
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PHASOFF @ $C080 ;
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PHASON @ $C081 ;
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MOTOROFF @ $C088 ;
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MOTORON @ $C089 ;
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DRV0EN @ $C08A ;
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DRV1EN @ $C08B ;
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Q6L @ $C08C ;
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Q6H @ $C08D ;
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Q7L @ $C08E ;
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ACIASTAT @ $C0F1 ;status of ACIA
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; Other hardware registers
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Z_REG @ $FFD0 ;zero page register
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D_DDRB @ $FFD2 ;data direction register B
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D_DDRA @ $FFD3 ;data direction register A
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TIMER1L @ $FFD8
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TIMLATCH @ $FFD9
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D_ACR @ $FFDB
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D_PCR @ $FFDC
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D_IFR @ $FFDD
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D_IER @ $FFDE
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E_REG @ $FFDF ;environment register
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E_IORB @ $FFE0
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E_DDRB @ $FFE2
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E_DDRA @ $FFE3
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E_ACR @ $FFEB
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E_PCR @ $FFEC
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E_IFR @ $FFED
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E_IER @ $FFEE
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B_REG @ $FFEF ;bank switch register
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