base:asm_include_file_for_basic_routines
; C64 BASIC ROM vectors ; by White Flame ;--------- ; Input ; get next byte of BASIC text chrget = $0073 ; chrget uint8 to .X (range checking) getbytc = $b79b ; chrget uint16 (0-63999) to $14-$15 linget = $a96b ; chrget a float to fac1 fin = $bcf3 ; check for and skip open paren (syntax error otherwise) chkopn = $aefa ; check for and skip close paren (syntax error otherwise) chkcls = $aef7 ; check for and skip comma (syntax error otherwise) chkcom = $aefd chkcom2 = $e20e ;??? ; check for and skip char in .A (syntax error otherwise) synchr = $aeff ; skip comma and get int8 in .x comint = $e200 ; default chrget routine initat = $e3a2 ;--------- ; Output ; print zero-terminated string @ <A >Y strout = $ab1e ; print uint16 <X >A linprt = $bdcd ; print BASIC token from .A qplop = $a717 ; <A >Y = @ str(fac1) (always returns $0100) fout = $bddd ;--------- ; FP/Int conversion ; fac1 to int16 at $64-$65 big-endian, also <Y >A (range check) fac1ya = $b1aa ; fac1 to int16 at $64-$65 big-endian (range check) ayint = $b1bf ; fac1 to uint16 at $14-$15 (range check) getadr = $b7f7 ; fac1 to int32 at $62-65 big-endian qint = $bc9b ; fac1 = @ <Y >A (int16) givayf = $b391 ; fac1 += .A(int8) finlog = $bd7e ; .A = sgn(fac1), returns 0/1/255 sign = $bc2b ; .A = sgn( fac1 - fac(@ <A >Y) ) fcomp = $bc5b ; fac1 = .A (int8) ;bc3c ; fac1 = .A (uint8) ;b3a2 ;--------- ; FP/Int conversion, more manual steps ; fac1 = <Y >A (uint16) ; LDY #low ; LDA #high ; STY $63 ; STA $62 ; LDX #$90 ; SEC ; JSR $BC49 ; fac1 = int24 ; LDA #low ; LDX #mid ; LDY #high ; STY $62 ; STX $63 ; STA $64 ; LDA $62 ; EOR #$FF ; ASL A ; LDA #0 ; STA $65 ; LDX #$98 ; JSR $BC4F ; fac1 = uint24 ; LDA #low ; LDX #mid ; LDX #high ; JSR $AF87 ; JSR $AF7E ; fac1 = int32 from $62-$65 big endian ; LDA $62 ; EOR #$FF ; ASL A ; LDA #0 ; LDX #$A0 ; JSR $BC4F ; fac1 = uint32 from $62-$65 big endian ; SEC ; LDA #0 ; LDX #$A0 ; JSR $BC4F ;--------- ; FP copying ; fac2 = @ <A >Y, 4 byte format conupk = $ba8c ; fac1 = @ <A >Y, 5 byte format movfm = $bbd4 ;also bba2? ; @ <X >Y = fac1, 5 byte format mov2f = $bbc7 ; fac1 = fac2 movfa = $bbfc ; fac2 = fac1 (rounded w/rounding byte) movaf = $bc0c ; fac2 = fac1 movef = $bc0f ;--------- ; FP simple math ; fac1 += 0.5 faddh = $b849 ; fac1 *= 10 mul10 = $bae2 ; fac1 /= 10 div10 = $bafe ; fac1 -= fac(@ <A >Y) fsub = $b850 ; fac1 -= fac2 fsubt = $b853 ; fac1 += fac(@ <A >Y) fadd = $b867 ; fac1 += fac2 faddt = $b86a ; fac1 *= fac2 fmult = $ba28 ; fac1 += .A * fac2 faddmult = $ba59 ; fac1 = fac(@ <A >Y) / fac1 (div by 0 check) fdiv = $bb0f ; fac1 = fac2 / fac1 (div by 0 check) fdivt = $bb12 ; round fac1, using rounding byte round = $bc1b ; fac1 = sgn(fac1) sgn = $bc39 ; fac1 = abs(fac1) abs = $bc58 ; fac1 = int(fac1) int = $bccc ; normalize fac1 normal = $b8fe ; negate fac1 negfac = $b947 ; fac1 = not(fac1), ie -fac1 - 1 negop = $bfb4 ; fac1 = next random number rndnext = $e0be ;--------- ; FP transcendental math ; fac1 = sqrt(fac1) sqr = $bf71 ; fac1 = fac2 ^ fac1 (that's to the power of, not xor) fpwrt = $bf7b ; fac1 = exp(fac1) exp = $bfed ; fac1 = ln(fac1) log = $b9c1 ; fac1 = cos(fac1) cos = $e264 ; fac1 = sin(fac1) sin = $e268 ; fac1 = tan(fac1) tan = $e2b4 ; fac1 = atn(fac1) atn = $e20e ;--------- ; FP constants (5-byte) ; 1.0 fone = $b9bc ; 10.0 tenc = $baf9 ; pi pival = $aea8 ; -32768.0 n32768 = $b1a5 ; 99,999,999.5 ; 999,999,999.5 ; 1,000,000,000.0 no999 = $bdb3 ; 0.5 fhalf = $bf11 ; 1/log(2) expcon = $bfbf ; rnd multiplier rmulc = $e08d ; rnd adder raddc = $e092 ; default rnd seed rndseed = $e3ba ; pi/2 pi2 = $e2e0 ; 2*pi twopi = $e2e5 ; 1/4 fr4 = $e2ea ;--------- ; FP constants (4-byte) ; -1 ; +10 ; -100 ; +1000 ; -10,000 ; +100,000 ; -1,000,000 ; +10,000,000 ;-100,000,000 foutbl = $bf1c ; 6 constants for TI$ conversion fcdend = $bf3a ;--------- ; Polynomial constants (1 byte length, then 5 bytes per entry) ; log constants logcn2 = $b9c1 ; sin/cos/tan sincon = $e2ef ; atan atncon = $e33e
base/asm_include_file_for_basic_routines.txt · Last modified: 2017-10-26 07:27 by white_flame