6502
/
65816.js
mirror of https://github.com/pskupinski/65816.js.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

added ADC direct page and ADC absolute

This commit is contained in:
Preston Skupinski 2011-05-07 13:08:02 -04:00
parent 861a8183b2
commit 1f127547e1
2 changed files with 93 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
cpu.js
View File

@ -80,7 +80,8 @@ function CPU_65816() {
0x6c : JMP_absolute_indirect, 0x80 : BRA,
0xf0 : BEQ, 0xd0 : BNE, 0x90 : BCC, 0xb0 : BCS,
0x50 : BVC, 0x70 : BVS, 0x10 : BPL, 0x30 : BMI,
0x69 : ADC_const };
0x69 : ADC_const, 0x6d : ADC_absolute,
0x65 : ADC_direct_page };
}
var MMU = {
@ -179,6 +180,37 @@ var ADC_const = {
}
};
var ADC_absolute = {
bytes_required:function() {
return 3;
},
execute:function(cpu, bytes) {
var location = (bytes[1]<<8)|bytes[0];
if(cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte(location)]);
} else {
var low_byte = cpu.mmu.read_byte(location);
var high_byte = cpu.mmu.read_byte(location+1);
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var ADC_direct_page = {
bytes_required:function() {
return 2;
},
execute:function(cpu, bytes) {
if(cpu.p.m) {
ADC_const.execute(cpu, [cpu.mmu.read_byte(bytes[0])]);
} else {
var low_byte = cpu.mmu.read_byte(bytes[0]);
var high_byte = cpu.mmu.read_byte(bytes[0]+1);
ADC_const.execute(cpu, [low_byte, high_byte]);
}
}
};
var BMI = {
bytes_required:function() {
return 2;

60
test/tests.js
View File

@ -114,6 +114,66 @@ function test_adc() {
equals(cpu.p.n, 1, "0x7fff + 0x0001 should set the negative(n) bit when "+
"using ADC");
});
test("Test ADC direct page with 8-bit numbers (m bit is 1)", function() {
var cpu = new CPU_65816();
cpu.execute("18fb18e230a90185ffa97f65ff");
equals(cpu.r.a, 0x80, "0x7f + 0x01 should result in 0x80 when "+
"using ADC");
equals(cpu.p.v, 1, "0x7f + 0x01 should set the overflow(v) bit when "+
"using ADC");
equals(cpu.p.c, 0, "0x7f + 0x01 should not set the carry(c) bit when "+
"using ADC");
equals(cpu.p.z, 0, "0x7f + 0x01 should not set the zero(z) bit when "+
"using ADC");
equals(cpu.p.n, 1, "0x7f + 0x01 should set the negative(n) bit when "+
"using ADC");
});
test("Test ADC direct page with 16-bit numbers (m bit is 0)", function() {
var cpu = new CPU_65816();
cpu.execute("18fb18c230a9010085ffa9ff7f65ff")
equals(cpu.r.a, 0x8000, "0x7fff + 0x0001 should result in 0x8000 when "+
"using ADC");
equals(cpu.p.v, 1, "0x7fff + 0x0001 should set the overflow(v) bit when "+
"using ADC");
equals(cpu.p.c, 0, "0x7fff + 0x0001 should not set the carry(c) bit when "+
"using ADC");
equals(cpu.p.z, 0, "0x7fff + 0x0001 should not set the zero(z) bit when "+
"using ADC");
equals(cpu.p.n, 1, "0x7fff + 0x0001 should set the negative(n) bit when "+
"using ADC");
});
test("Test ADC absolute with 8-bit numbers (m bit is 1)", function() {
var cpu = new CPU_65816();
cpu.execute("18fb18e230a9018dffffa97f6dffff");
equals(cpu.r.a, 0x80, "0x7f + 0x01 should result in 0x80 when "+
"using ADC");
equals(cpu.p.v, 1, "0x7f + 0x01 should set the overflow(v) bit when "+
"using ADC");
equals(cpu.p.c, 0, "0x7f + 0x01 should not set the carry(c) bit when "+
"using ADC");
equals(cpu.p.z, 0, "0x7f + 0x01 should not set the zero(z) bit when "+
"using ADC");
equals(cpu.p.n, 1, "0x7f + 0x01 should set the negative(n) bit when "+
"using ADC");
});
test("Test ADC absolute with 16-bit numbers (m bit is 0)", function() {
var cpu = new CPU_65816();
cpu.execute("18fb18c230a901008dffffa9ff7f6dffff")
equals(cpu.r.a, 0x8000, "0x7fff + 0x0001 should result in 0x8000 when "+
"using ADC");
equals(cpu.p.v, 1, "0x7fff + 0x0001 should set the overflow(v) bit when "+
"using ADC");
equals(cpu.p.c, 0, "0x7fff + 0x0001 should not set the carry(c) bit when "+
"using ADC");
equals(cpu.p.z, 0, "0x7fff + 0x0001 should not set the zero(z) bit when "+
"using ADC");
equals(cpu.p.n, 1, "0x7fff + 0x0001 should set the negative(n) bit when "+
"using ADC");
});
}
function test_branching() {