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6502.js
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var
gLicense ="olc6502 - An emulation of the 6502/2A03 processor\n\n";
gLicense+="\"Thanks Dad for believing computers were gonna be a big deal...\" - javidx9\n\n";
gLicense+="License (OLC-3)\n";
gLicense+="~~~~~~~~~~~~~~~\n\n";
gLicense+="Copyright 2018-2019 OneLoneCoder.com\n\n";
gLicense+="Redistribution and use in source and binary forms,with or without\n";
gLicense+="modification,are permitted provided that the following conditions\n";
gLicense+="are met:\n\n";
gLicense+="1. Redistributions or derivations of source code must retain the above\n";
gLicense+="copyright notice,this list of conditions and the following disclaimer.\n\n";
gLicense+="2. Redistributions or derivative works in binary form must reproduce\n";
gLicense+="the above copyright notice. This list of conditions and the following\n";
gLicense+="disclaimer must be reproduced in the documentation and/or other\n";
gLicense+="materials provided with the distribution.\n\n";
gLicense+="3. Neither the name of the copyright holder nor the names of its\n";
gLicense+="contributors may be used to endorse or promote products derived\n";
gLicense+="from this software without specific prior written permission.\n\n";
gLicense+="THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n";
gLicense+="\"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES,INCLUDING,BUT NOT\n";
gLicense+="LIMITED TO,THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n";
gLicense+="A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n";
gLicense+="HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,INDIRECT,INCIDENTAL,\n";
gLicense+="SPECIAL,EXEMPLARY,OR CONSEQUENTIAL DAMAGES (INCLUDING,BUT NOT\n";
gLicense+="LIMITED TO,PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n";
gLicense+="DATA,OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n";
gLicense+="THEORY OF LIABILITY,WHETHER IN CONTRACT,STRICT LIABILITY,OR TORT\n";
gLicense+="(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n";
gLicense+="OF THIS SOFTWARE,EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\n";
var
gBackground ="Background\n";
gBackground+="~~~~~~~~~~\n";
gBackground+="I love this microprocessor. It was at the heart of two of my favourite\n";
gBackground+="machines,the BBC Micro,and the Nintendo Entertainment System,as well\n";
gBackground+="as countless others in that era. I learnt to program on the Model B,and\n";
gBackground+="I learnt to love games on the NES,so in many ways,this processor is\n";
gBackground+="why I am the way I am today.\n\n";
gBackground+="In February 2019,I decided to undertake a selfish personal project and\n";
gBackground+="build a NES emulator. Ive always wanted to,and as such I've avoided\n";
gBackground+="looking at source code for such things. This made making this a real\n";
gBackground+="personal challenge. I know its been done countless times,and very likely\n";
gBackground+="in far more clever and accurate ways than mine,but I'm proud of this.\n\n";
gBackground+="Datasheet: http://archive.6502.org/datasheets/rockwell_r650x_r651x.pdf\n\n";
gBackground+="Files: olc6502.myH, olc6502.cpp\n\n";
gBackground+="Translated from C++ to JavaScript by Gregory Scott Callen\n"
gBackground+="all in one go Wednesday, May 13, 2020\n\n"
var
gLinks ="Relevant Video:\n\n";
gLinks+="Links\n\n";
gLinks+="~~~~~\n\n";
gLinks+="YouTube: https://www.youtube.com/javidx9\n\n";
gLinks+=" https://www.youtube.com/javidx9extra\n\n";
gLinks+="Discord: https://discord.gg/WhwHUMV\n\n";
gLinks+="Twitter: https://www.twitter.com/javidx9\n\n";
gLinks+="Twitch: https://www.twitch.tv/javidx9\n\n";
gLinks+="GitHub: https://github.com/onelonecoder\n\n";
gLinks+="Patreon: https://www.patreon.com/javidx9\n\n";
gLinks+="Homepage: https://www.onelonecoder.com\n\n";
gLinks+="Author\n\n";
gLinks+="~~~~~~\n\n";
gLinks+="David Barr,aka javidx9,©OneLoneCoder 2019\n\n";
var hi,lo;
var a,x,y,pc,sp,sr,asmlow=0x10000,asmhigh=0;
var addr_abs,addr_rel,addr,oldpc;
var fetched,opcode,cycles;
var N=128,V=64,U=32,B=16,D=8,I=4,Z=2,C=1;
var gClock=99999999,gTime,gWait=99999999;
var gSystemBus=new Array(0xFFFF);
function aaClock()
{
opcode=aaRead(pc);
pc++;pc&=0xFFFF;
cycles=lookup[opcode][3];
additional_cycle1=lookup[opcode][2]();
additional_cycle2=lookup[opcode][1]();
cycles+=(additional_cycle1 & additional_cycle2);
aaSetFlag(U,true);
aaDisassemble(19,2);
aaDrawCPU(2,2);
}
function aaComplete()
{
return(cycles==0);
}
function aaCreate()
{
// Load Program (assembled at https://www.masswerk.at/6502/assembler.html)
/*
*=$8000
LDX #10
STX $0000
LDX #3
STX $0001
LDY $0000
LDA #0
CLC
loop
ADC $0001
DEY
BNE loop
STA $0002
NOP
NOP
NOP
*/
var addr;
for(addr=0;addr<0xFFFF;addr++)
{
gSystemBus[addr]=0;
}
// Atari BASIC $A000 to $BFFF
var l=0,b;
l=0;myx=0;
while(myx<gBASIC.length){
addr=gBASIC[myx];
for(b=0;b<=15;b++)
{
gSystemBus[addr+b]=gBASIC[myx+b+1];
}
l++;myx=l*17;
}
// Atari OS Revision B $D800 to $FFFF
l=0;myx=0;
while(myx<gOSB.length){
addr=gOSB[myx];
for(b=0;b<=15;b++)
{
gSystemBus[addr+b]=gOSB[myx+b+1];
}
l++;myx=l*17;
}
aaDrawRam(0);
aaDrawRam(0x0100);
aaDrawRam(pc-0x60);
aaReset();
return(true);
}
function aaDisassemble(horz,vert)
{
var value,lo,hi,myline,oldline,str;
var mapLines,sInst,asm;
var redraw=false;
if((pc<asmlow+5)||(pc>asmhigh-5)){
redraw=true;
aaDrawRam(pc-0x60);
asmlow=pc-30;
}
asm=asmlow;
while(vert<58){
value=0x00;lo=0x00;hi=0x00;
myline=(asm==pc);
oldline=(asm==oldpc);
mapLines="";sInst="";
sInst=aaToHex(asm,4)+" ";
opcode=aaRead(asm);asm++;
opcode&=0xFF;
sInst+=lookup[opcode][0]+" ";
if(lookup[opcode][2]==IMP){
//sInst+="IMP";
}
else if(lookup[opcode][2]==IMM){
value=aaRead(asm,true);asm++;
str="#$"+aaToHex(value,2);
sInst+=str;
}
else if (lookup[opcode][2] == ZP0){
lo = aaRead(asm,true); asm++;
hi = 0x00;
value = lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,2);
sInst+=str;
}
else if (lookup[opcode][2] == ZPX){
lo = aaRead(asm,true); asm++;
hi = 0x00;
value = lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,2);
str+=",X";
sInst+=str;
}
else if (lookup[opcode][2] == ZPY){
lo = aaRead(asm,true); asm++;
hi = 0x00;
value = lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,2);
str+=",Y";
sInst+=str;
}
else if (lookup[opcode][2] == IZX){
lo = aaRead(asm,true); asm++;
hi = 0x00;
value = lo;
str=aaLabel(value);
if(str==-1)str=aaToHex(value,2);
sInst+="($"+str+",X)";
}
else if (lookup[opcode][2] == IZY){
lo = aaRead(asm,true); asm++;
hi = 0x00;
value = lo;
str=aaLabel(value);
if(str==-1)str="($"+aaToHex(value,2);
sInst+=str+"),Y";
}
else if (lookup[opcode][2] == ABS){
lo = aaRead(asm,true); asm++;
hi = aaRead(asm,true); asm++;
value=(hi<<8)|lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,4);
sInst+=str;
}
else if (lookup[opcode][2] == ABX){
lo = aaRead(asm,true); asm++;
hi = aaRead(asm,true); asm++;
value=(hi<<8)|lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,4);
str+=",X";
sInst+=str;
}
else if (lookup[opcode][2] == ABY){
lo = aaRead(asm,true); asm++;
hi = aaRead(asm,true); asm++;
value=(hi<<8)|lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,4);
str+=",Y";
sInst+=str;
}
else if (lookup[opcode][2] == IND){
lo = aaRead(asm,true); asm++;
hi = aaRead(asm,true); asm++;
value=(hi<<8)|lo;
str=aaLabel(value);
if(str==-1)str="$"+aaToHex(value,4);
str="("+str+")";
sInst+=str;
}
else if (lookup[opcode][2] == REL)
{
value = aaRead(asm,true); asm++;
if(value&0x80)value|=0xFF00;value=(asm+value)&0xFFFF;
sInst += "$"+aaToHex(value,2)+" [$"+aaToHex(value,4)+"]";
}
sInst=" "+sInst;
while(sInst.length<23)sInst+=" ";
if(redraw){
aaPrint(0xFFF,0x009,horz,vert,sInst);
}
if(oldline){
aaPrint(0xFFF,0x009,horz,vert,sInst);
}
if(myline){
aaPrint(0x009,0x0CC,horz,vert,sInst);
}
vert++;
}
oldpc=pc;
asmhigh=asm;
}
function aaDrawByte(address,data,write)
{
var num,col,row,mystr;
if((address>=0x00)&&(address<0x100))
{
if(write){
col=((address&0xF)*3)+50;
row=((address>>4)&0xF)+2;
num=" "+aaToHex(data,2)+" ";
aaPrint(0xFFF,0x009,col,row,num);
}
}
else if((address>=0x0100)&&(address<0x0200))
{
if(write){
col=((address&0xF)*3)+50;
row=((address>>4)&0xF)+20;
num=" "+aaToHex(data,2)+" ";
aaPrint(0xFFF,0x009,col,row,num);
}
}
aaDrawOther(address,data,write);
}
function aaDrawCPU(horz,vert)
{
aaPrint(0xFFF,0x000,horz,vert," ");vert++;
aaPrint(0xFFF,0x000,horz,vert," SR: ");
aaPrint(((sr & N)>0)?0x0F0:0xF00,0x000,horz+5,vert,"N");
aaPrint(((sr & V)>0)?0x0F0:0xF00,0x000,horz+6,vert,"V");
aaPrint(((sr & U)>0)?0x0F0:0xF00,0x000,horz+7,vert,"-");
aaPrint(((sr & B)>0)?0x0F0:0xF00,0x000,horz+8,vert,"B");
aaPrint(((sr & D)>0)?0x0F0:0xF00,0x000,horz+9,vert,"D");
aaPrint(((sr & I)>0)?0x0F0:0xF00,0x000,horz+10,vert,"I");
aaPrint(((sr & Z)>0)?0x0F0:0xF00,0x000,horz+11,vert,"Z");
aaPrint(((sr & C)>0)?0x0F0:0xF00,0x000,horz+12,vert,"C ");
aaPrint(0xFFF,0x000,horz,vert+1," ");
horz++;
aaPrint(0xFFF,0x009,horz,vert+3,"PC: $"+aaToHex(pc,4));
aaPrint(0xFFF,0x009,horz,vert+4,"SP: $"+"01"+aaToHex(sp,2));
aaPrint(0xFFF,0x009,horz,vert+5," A: $"+aaToHex(a,2)+" ["+a+"] ");
aaPrint(0xFFF,0x009,horz,vert+6," X: $"+aaToHex(x,2)+" ["+x+"] ");
aaPrint(0xFFF,0x009,horz,vert+7," Y: $"+aaToHex(y,2)+" ["+y+"] ");
}
function aaDrawOther(address,data,write)
{
var mystr;
aaScroll();
mystr=" "+aaToHex(pc,4);
mystr+=" "+aaToHex(address,4);
mystr+=" "+aaToHex(data,2)+" ";
if(write)aaPrint(0xFFF,0x009,2,12,mystr);
else aaPrint(0xF00,0x000,2,12,mystr);
}
function aaDrawRam(address)
{
var row,col;
var sOffset="";
address&=0xFFF0;
for (row=0;row<16;row++)
{
sOffset+="$"+aaToHex(address,4)+":";
for(col=0;col<16;col++)
{
sOffset+=" "+aaToHex(aaRead(address),2);
address++;
}
sOffset+="\n";
}
if(address==0x100){
aaPrint(0xFFF,0x009,44,2,sOffset);
}else if(address==0x200){
aaPrint(0xFFF,0x009,44,20,sOffset);
}else{
aaPrint(0xFFF,0x009,44,38,sOffset);
}
}
function aaFetch()
{
if (lookup[opcode][2]!=IMP)
fetched=aaRead(addr_abs);
return(fetched);
}
function aaGetFlag(flag)
{
if((sr&flag)==0)
return(false);
else
return(true);
}
function aaHighlight(horz,vert){
var myx,myy,mychr,mystr,myline;
for(myy=0;(vert+myy)<57;myy++){
myline="";
for(myx=0;myx<23;myx++){
mychr=aaScreenGet(horz+myx,vert+myy);
mychr&=0x7F;
myline+=fromCharCode(mychr);
}
mystr=myline.substr(1,4);
mystr=parseInt(mystr,16);
}
}
function aaLabel(value){
var i,r=-1;
if ( value < 256) {
for(i=0;i<gZPAGE.length;i++){
if(gZPAGE[i][0]==value)r=gZPAGE[i][1];
}
}
if (( value >= 0x200 )&&( value < 0x2FF )) {
for(i=0;i<gPTWO.length;i++){
if(gPTWO[i][0]==value)r=gPTWO[i][1];
}
}
if (( value >= 0xD000 )&&( value < 0xDFFF )) {
for(i=0;i<gHW.length;i++){
if(gHW[i][0]==value)r=gHW[i][1];
}
}
if ( value >= 0xE000 ) {
for(i=0;i<gOS.length;i++){
if(gOS[i][0]==value)r=gOS[i][1];
}
}
return r;
}
function aaRead(address)
{
if(address==0xD01F)gWait=99999999;
return(gSystemBus[address]&0xFF);
}
function aaReset()
{
addr_abs = 0xFFFC;
lo = aaRead(addr_abs + 0);
hi = aaRead(addr_abs + 1);
pc = (hi << 8) | lo;
a = 251;
x = 239;
y = 0;
sp = 0xFD;
sr = 0x00 | U;
addr_rel = 0x0000;
addr_abs = 0x0000;
fetched = 0x00;
cycles = 8;
aaDrawRam(0);
aaDrawRam(0x0100);
aaDrawRam(pc-0x80);
aaDisassemble(19,2);
aaDrawCPU(2,2);
// gSystemBus[0xD01F]=0x08;
}
function aaReturn(){
var c,s,address=0,data=0;
if(((aaScreenGet(44,gVert)&0x7F)=="P".charCodeAt(0))&&
((aaScreenGet(45,gVert)&0x7F)=="C".charCodeAt(0))){
for(c=47;c<=50;c++){
s=aaScreenGet(c,gVert)&0x7F;
address<<=4;
if((s>=48)&&(s<=57)){
address+=(s-48);
}else if((s>=65)&&(s<65+6)){
address+=(s-55);
}
}
pc=address;
aaDrawCPU(2,2);
aaDrawRam(pc-0x80);
aaDisassemble(19,2);
console.log("pc="+aaToHex(address,4));
}else if(((aaScreenGet(44,gVert)&0x7F)=="S".charCodeAt(0))&&
((aaScreenGet(45,gVert)&0x7F)=="P".charCodeAt(0))){
for(c=47;c<=48;c++){
s=aaScreenGet(c,gVert)&0x7F;
address<<=4;
if((s>=48)&&(s<=57)){
address+=(s-48);
}else if((s>=65)&&(s<65+6)){
address+=(s-55);
}
}
sp=address;
aaDrawCPU(2,2);
address+=0x100;
console.log("sp="+aaToHex(address,4));
}else if(((aaScreenGet(44,gVert)&0x7F)=="S".charCodeAt(0))&&
((aaScreenGet(45,gVert)&0x7F)=="R".charCodeAt(0))){
for(c=47;c<=48;c++){
s=aaScreenGet(c,gVert)&0x7F;
data<<=4;
if((s>=48)&&(s<=57)){
data+=(s-48);
}else if((s>=65)&&(s<65+6)){
data+=(s-55);
}
}
console.log("SR="+aaToHex(data,2));
sr=data;
aaDrawCPU(2,2);
}else if(((aaScreenGet(44,gVert)&0x7F)=="A".charCodeAt(0))&&
((aaScreenGet(45,gVert)&0x7F)==" ".charCodeAt(0))){
for(c=46;c<=47;c++){
s=aaScreenGet(c,gVert)&0x7F;
data<<=4;
if((s>=48)&&(s<=57)){
data+=(s-48);
}else if((s>=65)&&(s<65+6)){
data+=(s-55);
}
}
console.log("A="+aaToHex(data,2));
a=data;
aaDrawCPU(2,2);
}else if(((aaScreenGet(44,gVert)&0x7F)=="X".charCodeAt(0))&&
((aaScreenGet(45,gVert)&0x7F)==" ".charCodeAt(0))){
for(c=46;c<=47;c++){
s=aaScreenGet(c,gVert)&0x7F;
data<<=4;
if((s>=48)&&(s<=57)){
data+=(s-48);
}else if((s>=65)&&(s<65+6)){
data+=(s-55);
}
}
console.log("X="+aaToHex(data,2));
x=data;
aaDrawCPU(2,2);
}else if(((aaScreenGet(44,gVert)&0x7F)=="Y".charCodeAt(0))&&
((aaScreenGet(45,gVert)&0x7F)==" ".charCodeAt(0))){
for(c=46;c<=47;c++){
s=aaScreenGet(c,gVert)&0x7F;
data<<=4;
if((s>=48)&&(s<=57)){
data+=(s-48);
}else if((s>=65)&&(s<65+6)){
data+=(s-55);
}
}
console.log("Y="+aaToHex(data,2));
y=data;
aaDrawCPU(2,2);
}else{
for(c=44;c<=47;c++){
s=aaScreenGet(c,gVert)&0x7F;
address<<=4;
if((s>=48)&&(s<=57)){
address+=(s-48);
}else if((s>=65)&&(s<65+6)){
address+=(s-55);
}
}
for(c=49;c<=50;c++){
s=aaScreenGet(c,gVert)&0x7F;
data<<=4;
if((s>=48)&&(s<=57)){
data+=(s-48);
}else if((s>=65)&&(s<65+6)){
data+=(s-55);
}
}
console.log("address="+aaToHex(address,4)+" data="+aaToHex(data,2));
gSystemBus[address]=data;
aaDrawByte(address,data,true);
}
}
function aaScroll(){
var myx,myy,temp,on,off,chr,from,to;
for(myy=56;myy>11;myy--){
for(myx=0;myx<19;myx++){
from=gScreenData[(myy<<7)|myx];
to=gScreenData[((myy+1)<<7)|myx];
if(from==to)continue;
chr=from&0xFF;
off=(from>>8)&0xFFF;
on=(from>>20)&0xFFF;
aaScreenPut(on,off,chr,myx,myy+1);
}
}
}
function aaSetFlag(flag,value)
{
if(value)
sr|=flag;
else
sr&=~flag;
}
// Copyright © 2020 by Gregory Scott Callen
// All Rights Reserved.
function aaToDec(num,dig){
var myr=parseInt(num);
myr+="";
while(dig>myr.length){
myr=" "+myr;
}
return(myr);
}
function aaToHex(num,dig){
var myR="";
for(var n=0;n<dig;n++){
myR=gHex.substr(num&15,1)+myR;
num>>=4;
}
return(myR);
}
function aaWrite(address,data)
{
write=false;
if(address<0xA000){
gSystemBus[address]=data&0xFF;
write=true;
}else if((address>=0xD000)&&(address<0xD800)){
// if(address!=0xD01F){
gSystemBus[address]=data&0xFF;
write=true;
// }
}
aaDrawByte(address,data,write);
}
var ABS=function()
{
lo=aaRead(pc);
pc++;pc&=0xFFFF;
hi=aaRead(pc);
pc++;pc&=0xFFFF;
addr_abs=(hi<<8)|lo;
return(0);
}
var ABX=function()
{
lo=aaRead(pc);
pc++;pc&=0xFFFF;
hi=aaRead(pc);
pc++;pc&=0xFFFF;
addr_abs=(hi<<8)|lo;
addr_abs+=x;
if((addr_abs&0xFF00)!=(hi<<8))
return(1);
else
return(0);
}
var ABY=function()
{
lo=aaRead(pc);
pc++;pc&=0xFFFF;
hi=aaRead(pc);
pc++;pc&=0xFFFF;
addr_abs=(hi<<8)|lo;
addr_abs+=y;
if((addr_abs&0xFF00)!=(hi<<8))
return(1);
else
return(0);
}
var ADC=function()
{
aaFetch();
temp=a+fetched+aaGetFlag(C);
aaSetFlag(C,temp>255);
aaSetFlag(Z,(temp&0x00FF)==0);
aaSetFlag(V,(~(a^fetched)&(a^temp))&0x0080);
aaSetFlag(N,temp&0x0080);
a=temp&0x00FF;
return(1);
}
var AND=function()
{
aaFetch();
a=a&fetched;
aaSetFlag(Z,a==0x00);
aaSetFlag(N,a&0x80);
return(1);
}
var ASL=function()
{
aaFetch();
temp=fetched<<1;
aaSetFlag(C,(temp&0xFF00)>0);
aaSetFlag(Z,(temp&0x00FF)==0x00);
aaSetFlag(N,temp&0x80);
if(lookup[opcode][2]==IMP)
a=temp&0x00FF;
else
aaWrite(addr_abs,temp&0x00FF);
return(0);
}
var BCC=function()
{
if(aaGetFlag(C)==false)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))
cycles++;
pc=addr_abs;
}
return(0);
}
var BCS=function()
{
if(aaGetFlag(C)==1)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))
cycles++;
pc=addr_abs;
}
return(0);
}
var BEQ=function()
{
if(aaGetFlag(Z)==1)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))
cycles++;
pc=addr_abs;
}
return(0);
}
var BIT=function()
{
aaFetch();
temp=a&fetched;
aaSetFlag(Z,(temp&0x00FF)==0x00);
aaSetFlag(N,fetched&(1<<7));
aaSetFlag(V,fetched&(1<<6));
return(0);
}
var BMI=function()
{
if(aaGetFlag(N)==1)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))
cycles++;
pc=addr_abs;
}
return(0);
}
var BNE=function()
{
if(aaGetFlag(Z)==0)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))cycles++;
pc=addr_abs;
}
return(0);
}
var BPL=function()
{
if(aaGetFlag(N)==0)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))cycles++;
pc=addr_abs;
}
return(0);
}
var BRK=function()
{
pc++;pc&=0xFFFF;
aaSetFlag(I,1);
aaWrite(0x0100+sp,(pc>>8)&0x00FF);
sp--;sp&=0xFF;
aaWrite(0x0100+sp,pc&0x00FF);
sp--;sp&=0xFF;
aaSetFlag(B,1);
aaWrite(0x0100+sp,sr);
sp--;sp&=0xFF;
aaSetFlag(B,0);
pc=aaRead(0xFFFE)|(aaRead(0xFFFF)<<8);
return(0);
}
var BVC=function()
{
if(aaGetFlag(V)==0)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))cycles++;
pc=addr_abs;
}
return(0);
}
var BVS=function()
{
if(aaGetFlag(V)==1)
{
cycles++;
addr_abs=(pc+addr_rel)&0xFFFF;
if((addr_abs&0xFF00)!=(pc&0xFF00))cycles++;
pc=addr_abs;
}
return(0);
}
var CLC=function()
{
aaSetFlag(C,false);
return(0);
}
var CLD=function()
{
aaSetFlag(D,false);
return(0);
}
var CLI=function()
{
aaSetFlag(I,false);
return(0);
}
var CLV=function()
{
aaSetFlag(V,false);
return(0);
}
var CMP=function()
{
aaFetch();
temp=a-fetched;
aaSetFlag(C,a>=fetched);
aaSetFlag(Z,(temp&0x00FF)==0x0000);
aaSetFlag(N,temp&0x0080);
return(1);
}
var CPX=function()
{
aaFetch();
temp=x-fetched;
aaSetFlag(C,x>=fetched);
aaSetFlag(Z,(temp&0x00FF)==0x0000);
aaSetFlag(N,temp&0x0080);
return(0);
}
var CPY=function()
{
aaFetch();
temp=y-fetched;
aaSetFlag(C,y>=fetched);
aaSetFlag(Z,(temp&0x00FF)==0x0000);
aaSetFlag(N,temp&0x0080);
return(0);
}
var DEC=function()
{
aaFetch();
temp=fetched-1;
aaWrite(addr_abs,temp&0x00FF);
aaSetFlag(Z,(temp&0x00FF)==0x0000);
aaSetFlag(N,temp&0x0080);
return(0);
}
var DEX=function()
{
x--;x&=0xFF;
aaSetFlag(Z,x==0x00);
aaSetFlag(N,x&0x80);
return(0);
}
var DEY=function()
{
y--;y&=0xFF;
aaSetFlag(Z,y==0x00);
aaSetFlag(N,y&0x80);
return(0);
}
var EOR=function()
{
aaFetch();
a=a^fetched;
aaSetFlag(Z,a==0x00);
aaSetFlag(N,a&0x80);
return(1);
}
var IMM=function()
{
addr_abs=pc++;
return(0);
}
var IMP=function()
{
fetched=a;
return(0);
}
var INC=function()
{
aaFetch();
temp=fetched+1;
aaWrite(addr_abs,temp&0x00FF);
aaSetFlag(Z,(temp&0x00FF)==0x0000);
aaSetFlag(N,temp&0x0080);
return(0);
}
var INX=function()
{
x++;x&=0xFF;
aaSetFlag(Z,x==0x00);
aaSetFlag(N,x&0x80);
return(0);
}
var INY=function()
{
y++;y&=0xFF;
aaSetFlag(Z,y==0x00);
aaSetFlag(N,y&0x80);
return(0);
}
var IND=function()
{
ptr_lo=aaRead(pc);
pc++;pc&=0xFFFF;
ptr_hi=aaRead(pc);
pc++;pc&=0xFFFF;
ptr=(ptr_hi<<8)|ptr_lo;
if(ptr_lo==0x00FF)
{
addr_abs=(aaRead(ptr&0xFF00)<<8)|aaRead(ptr);
}
else
{
addr_abs=(aaRead(ptr+1)<<8)|aaRead(ptr);
}
return(0);
}
var IRQ=function()
{
if(aaGetFlag(I)==0)
{
aaWrite(0x0100+sp,(pc>>8)&0x00FF);
sp--;sp&=0xFF;
aaWrite(0x0100+sp,pc&0x00FF);
sp--;sp&=0xFF;
aaSetFlag(B,0);
aaSetFlag(U,1);
aaSetFlag(I,1);
aaWrite(0x0100+sp,sr);
sp--;sp&=0xFF;
addr_abs=0xFFFE;
lo=aaRead(addr_abs+0);
hi=aaRead(addr_abs+1);
pc=(hi<<8)|lo;
cycles=7;
}
}
var IZX=function()
{
t=aaRead(pc);
pc++;pc&=0xFFFF;
lo=aaRead((t+x)&0x00FF);
hi=aaRead((t+x+1)&0x00FF);
addr_abs=(hi<<8)|lo;
return(0);
}
var IZY=function()
{
t=aaRead(pc);
pc++;pc&=0xFFFF;
lo=aaRead(t&0x00FF);
hi=aaRead((t+1)&0x00FF);
addr_abs=(hi<<8)|lo;
addr_abs+=y;
if((addr_abs&0xFF00)!=(hi<<8))
return(1);
else
return(0);
}
var JMP=function()
{
pc=addr_abs;
return(0);
}
var JSR=function()
{
pc--;
aaWrite(0x0100+sp,(pc>>8)&0x00FF);
sp--;sp&=0xFF;
aaWrite(0x0100+sp,pc&0x00FF);
sp--;sp&=0xFF;
pc=addr_abs;
return(0);
}
var LDA=function()
{
aaFetch ();
a = fetched;
aaSetFlag(Z,a==0x00);
aaSetFlag(N,a&0x80);
return(1);
}
var LDX=function()
{
aaFetch();
x=fetched;
aaSetFlag(Z,x==0x00);
aaSetFlag(N,x&0x80);
return(1);
}
var LDY=function()
{
aaFetch();
y=fetched;
aaSetFlag(Z,y==0x00);
aaSetFlag(N,y&0x80);
return(1);
}
var LSR=function()
{
aaFetch();
aaSetFlag(C,fetched&0x0001);
temp=fetched>>1;
aaSetFlag(Z,(temp&0x00FF)==0x0000);
aaSetFlag(N,temp&0x0080);
if(lookup[opcode][2]==IMP)
a=temp&0x00FF;
else
aaWrite(addr_abs,temp&0x00FF);
return(0);
}
var NMI=function()
{
aaWrite(0x0100+sp,(pc>>8)&0x00FF);
sp--;sp&=0xFF;
aaWrite(0x0100+sp,pc&0x00FF);
sp--;sp&=0xFF;
aaSetFlag(B,0);
aaSetFlag(U,1);