; Copyright 2019 Frank Milliron.
; See the LICENSE.txt file for distribution terms (Apache 2.0).

*SYNOPSIS Symbols for the Apple-1

; System Symbols

XAML             @ $24         ;Last "opened" location Low
XAMH             @ $25         ;Last "opened" location High
STL              @ $26         ;Store address Low
STH              @ $27         ;Store address High
L                @ $28         ;Hex value parsing Low
H                @ $29         ;Hex value parsing High
YSAV             @ $2A         ;Used to see if hex value is given
MODE             @ $2B         ;$00=XAM, $7F=STOR, $AE=BLOCK XAM

IN               @ $0200 128   ;Input buffer

USER             = $0280       ;Start of user RAM (to $0FFF or $1FFF)

KBD              @ $D010       ;PIA.A keyboard input
KBDCR            @ $D011       ;PIA.A keyboard control register
DSP              @ $D012       ;PIA.B display output register
DSPCR            @ $D013       ;PIA.B display control register


; WOZACI (Woz's Apple Cassette Interface) Symbols

HEX1L            @ $24         ;End address of dump block
HEX1H            @ $25
HEX2L            @ $26         ;Begin address of dump block
HEX2H            @ $27
SAVEINDEX        @ $28         ;Save index in input buffer
LASTSTATE        @ $29         ;Last input state

FLIP             @ $C000       ;Output flip-flop
TAPEIN           @ $C081       ;Tape input

WOZACI           @ $C100       ;Apple Cassette Interface Entry
NEXTCHAR         @ $C10C
KBDWAIT          @ $C10D
NEXTCMD          @ $C125       ;Start parsing first or a new tape command
NEXTCHR          @ $C12F
DIG              @ $C153
HEXSHIFT         @ $C159
GOESC            @ $C163       ;Return to monitor (ESCAPE), prints \ first
SEP              @ $C166       ;Separating period found. Copy HEX1 to HEX2
WRITE            @ $C170       ;Write a block of memory to tape
WRNEXT           @ $C175
WBITLOOP         @ $C17C
RESTIDX          @ $C189
READ             @ $C18D       ;Read from tape
NOTSTART         @ $C198
RDBYTE           @ $C1A4
RDBIT            @ $C1A6
FULLCYCLE        @ $C1BC
CMPLEVEL         @ $C1BF
WHEADER          @ $C1CC       ;Write header to tape
HCOUNT           @ $C1CE
WRITEBIT         @ $C1DB       ;Write a full bit cycle
WDELAY           @ $C1E0
WDELAY0          @ $C1E7
WRITE1           @ $C1EA
INCADDR          @ $C1F1       ;Increment current address and compare with last
NOCARRY          @ $C1FF       ;RTS


; Apple-1 Cassette BASIC

BASIC            @ $E000       ;Cold start location
WARMSTART        @ $E2B3       ;Warm start location


; Apple-1 ROM

RESET            @ $FF00       ;ROM cold start location
NOTCR            @ $FF0F
ESCAPE           @ $FF1A       ;Escape back to monitor
GETLINE          @ $FF1F
BACKSPACE        @ $FF26
NEXTCHAR         @ $FF29
SETSTOR          @ $FF40
SETMODE          @ $FF41
BLSKIP           @ $FF43
NEXTITEM         @ $FF44
NEXTHEX          @ $FF5F       ;trying to parse a new hex value
DIG              @ $FF6E
HEXSHIFT         @ $FF74
NOTHEX           @ $FF7F
TONEXTITEM       @ $FF91
RUN              @ $FF94       ;RUN user's program from last opened location
NOTSTOR          @ $FF97       ;We're not in Store mode
SETADR           @ $FF9B
NXTPRNT          @ $FFA4       ;Print address and data from this address
PRDATA           @ $FFBA
XAMNEXT          @ $FFC4
MOD8CHK          @ $FFD6
PRBYTE           @ $FFDC       ;Subroutine to print a byte in A in hex form (destructive)
PRHEX            @ $FFE5       ;Subroutine to print a hexadecimal digit
ECHO             @ $FFEF       ;Subroutine to print a character to the terminal
NMI_VEC          @ $FFFA       ;NMI vector   ($0F00)
RESET_VEC        @ $FFFC       ;RESET vector ($FF00)
IRQ_VEC          @ $FFFE       ;IRQ vector   ($0000)