mirror of
https://github.com/fadden/6502bench.git
synced 2024-07-31 07:29:00 +00:00
66 lines
2.1 KiB
Plaintext
66 lines
2.1 KiB
Plaintext
; Copyright 2018 faddenSoft. All Rights Reserved.
|
|
; See the LICENSE.txt file for distribution terms (Apache 2.0).
|
|
;
|
|
; Sources:
|
|
; What's Where in the Apple, by William F. Luebbert
|
|
|
|
*SYNOPSIS Applesoft BASIC addresses and constants
|
|
|
|
HCOLOR1 @ $1C ;hi-res color mask
|
|
COUNTH @ $1D ;hi-res high-order byte of step for line
|
|
HBASL @ $26 ;base address for hi-res drawing
|
|
|
|
LINNUM @ $50 ;line number ($50-51)
|
|
TEXTTAB @ $67 ;pointer to start of Applesoft program ($67-68)
|
|
VARTAB @ $69 ;pointer to start of Applesoft variables ($69-6A)
|
|
FACMO @ $A0 ;middle-order byte of mantissa of FAC
|
|
FACLO @ $A1 ;low-order byte of mantissa of FAC
|
|
FACSIGN @ $A2 ;single byte sign of FAC
|
|
CHRGET @ $B1 ;get next character or Applesoft token
|
|
CHRGOT @ $B7 ;get next, but don't advance TXTPTR
|
|
TXTPTR @ $B8 ;points at next char or token
|
|
|
|
AUTORUN @ $D6 ;set to $80 to auto-run
|
|
ERRFLG @ $D8 ;$80 if onerr active
|
|
|
|
HPAG @ $E6 ;hi-res page to draw on ($20 or $40)
|
|
SCALE @ $E7 ;hi-res graphics scale factor
|
|
|
|
AMPERV @ $03F5 ;jump to function that handles Applesoft '&' cmds
|
|
|
|
;
|
|
; Useful Applesoft routines.
|
|
; TODO: there are many more
|
|
;
|
|
ERROR @ $D412 ;print error based on X-reg
|
|
FRMNUM @ $DD67 ;evalute expression at TXTPTR, result into FAC
|
|
SYN_ERROR @ $DEC9 ;throw SYNTAX ERROR
|
|
CHKCOM @ $DEBE ;checks TXTPTR for comma
|
|
ILLQ_ERROR @ $E199 ;throw ILLEGAL QUANTITY ERROR
|
|
GETADR @ $E752 ;convert FAC to 2-byte integer in LINNUM
|
|
GETBYT @ $E6F8 ;gets byte, in X/FACLO
|
|
HFNS @ $F6B9 ;get hi-res x/y for hplot
|
|
|
|
;
|
|
; Applesoft BASIC tokens.
|
|
; TODO: this is a partial set
|
|
;
|
|
*TAG Applesoft-Tokens
|
|
TOK_PLOT = $8d
|
|
TOK_HGR2 = $90
|
|
TOK_HGR = $91
|
|
TOK_HCOLOR = $92
|
|
TOK_HPLOT = $93
|
|
TOK_DRAW = $94
|
|
TOK_XDRAW = $95
|
|
TOK_INVERSE = $9e
|
|
TOK_CLEAR = $bd
|
|
TOK_NEW = $bf
|
|
TOK_TO = $c1
|
|
TOK_AT = $c5
|
|
TOK_SGN = $d2
|
|
TOK_SCRN = $d7
|
|
TOK_EXP = $dd
|
|
TOK_COS = $de
|
|
TOK_SIN = $df
|