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65816.js
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fixed a mistake where I mixed up high byte and low byte in a few cases

This commit is contained in:
Preston Skupinski 2011-05-01 16:07:10 -04:00
parent fc3dba463d
commit 982107a90b
1 changed files with 31 additions and 31 deletions
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62
cpu.js
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@ -320,15 +320,15 @@ var LDA_direct_page_indexed_x = {
if(overflow_check > 0) {
location = overflow_check-1;
}
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location);
// Check for potential overflow again.
if(location===0xffff) {
location = 0;
} else {
location++;
}
var low_byte = cpu.mmu.read_byte(location);
cpu.r.a = high_byte | low_byte;
var high_byte = cpu.mmu.read_byte(location);
cpu.r.a = low_byte | high_byte;
}
if(cpu.r.a===0) {
cpu.p.z = 1;
@ -346,8 +346,8 @@ var LDA_absolute_indexed_y = {
if(cpu.p.m===1) {
cpu.r.a = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = high_byte | low_byte;
}
if(cpu.r.a===0) {
@ -366,8 +366,8 @@ var LDA_absolute_indexed_x = {
if(cpu.p.m===1) {
cpu.r.a = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = high_byte | low_byte;
}
if(cpu.r.a===0) {
@ -413,8 +413,8 @@ var LDY_absolute_indexed_x = {
if(cpu.p.m===1) {
cpu.r.y = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.y = high_byte | low_byte;
}
if(cpu.r.y===0) {
@ -438,14 +438,14 @@ var LDY_direct_page_indexed_x = {
if(overflow_check > 0) {
location = overflow_check-1;
}
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location);
// Check for potential overflow again.
if(location===0xffff) {
location = 0;
} else {
location++;
}
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location);
cpu.r.y = high_byte | low_byte;
}
if(cpu.r.a===0) {
@ -464,8 +464,8 @@ var LDY_absolute = {
if(cpu.p.m===1) {
cpu.r.y = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.y = high_byte | low_byte;
}
if(cpu.r.y===0) {
@ -484,8 +484,8 @@ var LDY_direct_page = {
if(cpu.p.m===1) {
cpu.r.y = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.y = high_byte | low_byte;
}
if(cpu.r.a===0) {
@ -545,8 +545,8 @@ var INC_absolute = {
temp = cpu.mmu.read_byte(location) + 1;
cpu.mmu.store_byte(location, temp);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
temp = high_byte | low_byte;
temp++;
high_byte = temp & 0xFF00;
@ -572,8 +572,8 @@ var INC_direct_page = {
temp = cpu.mmu.read_byte(location) + 1;
cpu.mmu.store_byte(location, temp);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
temp = high_byte | low_byte;
temp++;
high_byte = temp & 0xFF00;
@ -817,8 +817,8 @@ var LDX_direct_page = {
if(cpu.p.x===1) {
cpu.r.x = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.x = high_byte | low_byte;
}
if(cpu.r.x===0) {
@ -842,14 +842,14 @@ var LDX_direct_page_indexed_y = {
if(overflow_check > 0) {
location = overflow_check-1;
}
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location);
// Check for potential overflow again.
if(location===0xffff) {
location = 0;
} else {
location++;
}
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location);
cpu.r.x = high_byte | low_byte;
}
if(cpu.r.x===0) {
@ -869,8 +869,8 @@ var LDA_direct_page = {
if(cpu.p.m===1) {
cpu.r.a = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = high_byte | low_byte;
}
if(cpu.r.a===0) {
@ -889,8 +889,8 @@ var LDX_absolute_indexed_y = {
if(cpu.p.x===1) {
cpu.r.x = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = high_byte | low_byte;
}
if(cpu.r.x===0) {
@ -909,8 +909,8 @@ var LDX_absolute = {
if(cpu.p.x===1) {
cpu.r.x = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = high_byte | low_byte;
}
if(cpu.r.x===0) {
@ -929,8 +929,8 @@ var LDA_absolute = {
if(cpu.p.m===1) {
cpu.r.a = cpu.mmu.read_byte(location);
} else {
var high_byte = cpu.mmu.read_byte(location);
var low_byte = cpu.mmu.read_byte(location+1);
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
cpu.r.a = high_byte | low_byte;
}
if(cpu.r.a===0) {