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From a post on comp.sys.apple2: https://groups.google.com/d/msg/comp.sys.apple2/SBBdH1ChMwQ/mnygA3WVEAAJ
104 lines
3.7 KiB
Plaintext
104 lines
3.7 KiB
Plaintext
; Copyright 2019 Frank Milliron.
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; See the LICENSE.txt file for distribution terms (Apache 2.0).
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*SYNOPSIS Symbols for the Apple-1
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; System Symbols
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XAML @ $24 ;Last "opened" location Low
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XAMH @ $25 ;Last "opened" location High
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STL @ $26 ;Store address Low
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STH @ $27 ;Store address High
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L @ $28 ;Hex value parsing Low
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H @ $29 ;Hex value parsing High
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YSAV @ $2A ;Used to see if hex value is given
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MODE @ $2B ;$00=XAM, $7F=STOR, $AE=BLOCK XAM
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IN @ $0200 128 ;Input buffer
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USER = $0280 ;Start of user RAM (to $0FFF or $1FFF)
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KBD @ $D010 ;PIA.A keyboard input
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KBDCR @ $D011 ;PIA.A keyboard control register
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DSP @ $D012 ;PIA.B display output register
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DSPCR @ $D013 ;PIA.B display control register
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; WOZACI (Woz's Apple Cassette Interface) Symbols
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HEX1L @ $24 ;End address of dump block
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HEX1H @ $25
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HEX2L @ $26 ;Begin address of dump block
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HEX2H @ $27
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SAVEINDEX @ $28 ;Save index in input buffer
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LASTSTATE @ $29 ;Last input state
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FLIP @ $C000 ;Output flip-flop
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TAPEIN @ $C081 ;Tape input
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WOZACI @ $C100 ;Apple Cassette Interface Entry
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NEXTCHAR @ $C10C
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KBDWAIT @ $C10D
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NEXTCMD @ $C125 ;Start parsing first or a new tape command
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NEXTCHR @ $C12F
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DIG @ $C153
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HEXSHIFT @ $C159
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GOESC @ $C163 ;Return to monitor (ESCAPE), prints \ first
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SEP @ $C166 ;Separating period found. Copy HEX1 to HEX2
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WRITE @ $C170 ;Write a block of memory to tape
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WRNEXT @ $C175
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WBITLOOP @ $C17C
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RESTIDX @ $C189
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READ @ $C18D ;Read from tape
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NOTSTART @ $C198
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RDBYTE @ $C1A4
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RDBIT @ $C1A6
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FULLCYCLE @ $C1BC
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CMPLEVEL @ $C1BF
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WHEADER @ $C1CC ;Write header to tape
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HCOUNT @ $C1CE
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WRITEBIT @ $C1DB ;Write a full bit cycle
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WDELAY @ $C1E0
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WDELAY0 @ $C1E7
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WRITE1 @ $C1EA
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INCADDR @ $C1F1 ;Increment current address and compare with last
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NOCARRY @ $C1FF ;RTS
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; Apple-1 Cassette BASIC
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BASIC @ $E000 ;Cold start location
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WARMSTART @ $E2B3 ;Warm start location
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; Apple-1 ROM
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RESET @ $FF00 ;ROM cold start location
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NOTCR @ $FF0F
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ESCAPE @ $FF1A ;Escape back to monitor
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GETLINE @ $FF1F
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BACKSPACE @ $FF26
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NEXTCHAR @ $FF29
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SETSTOR @ $FF40
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SETMODE @ $FF41
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BLSKIP @ $FF43
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NEXTITEM @ $FF44
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NEXTHEX @ $FF5F ;trying to parse a new hex value
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DIG @ $FF6E
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HEXSHIFT @ $FF74
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NOTHEX @ $FF7F
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TONEXTITEM @ $FF91
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RUN @ $FF94 ;RUN user's program from last opened location
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NOTSTOR @ $FF97 ;We're not in Store mode
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SETADR @ $FF9B
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NXTPRNT @ $FFA4 ;Print address and data from this address
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PRDATA @ $FFBA
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XAMNEXT @ $FFC4
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MOD8CHK @ $FFD6
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PRBYTE @ $FFDC ;Subroutine to print a byte in A in hex form (destructive)
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PRHEX @ $FFE5 ;Subroutine to print a hexadecimal digit
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ECHO @ $FFEF ;Subroutine to print a character to the terminal
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NMI_VEC @ $FFFA ;NMI vector ($0F00)
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RESET_VEC @ $FFFC ;RESET vector ($FF00)
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IRQ_VEC @ $FFFE ;IRQ vector ($0000)
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