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https://github.com/pskupinski/65816.js.git
synced 2024-06-16 01:29:32 +00:00
added ADC direct page and ADC absolute
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parent
861a8183b2
commit
1f127547e1
34
cpu.js
34
cpu.js
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@ -80,7 +80,8 @@ function CPU_65816() {
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0x6c : JMP_absolute_indirect, 0x80 : BRA,
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0xf0 : BEQ, 0xd0 : BNE, 0x90 : BCC, 0xb0 : BCS,
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0x50 : BVC, 0x70 : BVS, 0x10 : BPL, 0x30 : BMI,
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0x69 : ADC_const };
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0x69 : ADC_const, 0x6d : ADC_absolute,
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0x65 : ADC_direct_page };
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}
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var MMU = {
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@ -179,6 +180,37 @@ var ADC_const = {
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}
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};
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var ADC_absolute = {
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bytes_required:function() {
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return 3;
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},
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execute:function(cpu, bytes) {
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var location = (bytes[1]<<8)|bytes[0];
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if(cpu.p.m) {
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ADC_const.execute(cpu, [cpu.mmu.read_byte(location)]);
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} else {
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var low_byte = cpu.mmu.read_byte(location);
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var high_byte = cpu.mmu.read_byte(location+1);
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ADC_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var ADC_direct_page = {
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bytes_required:function() {
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return 2;
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},
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execute:function(cpu, bytes) {
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if(cpu.p.m) {
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ADC_const.execute(cpu, [cpu.mmu.read_byte(bytes[0])]);
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} else {
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var low_byte = cpu.mmu.read_byte(bytes[0]);
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var high_byte = cpu.mmu.read_byte(bytes[0]+1);
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ADC_const.execute(cpu, [low_byte, high_byte]);
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}
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}
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};
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var BMI = {
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bytes_required:function() {
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return 2;
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@ -114,6 +114,66 @@ function test_adc() {
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equals(cpu.p.n, 1, "0x7fff + 0x0001 should set the negative(n) bit when "+
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"using ADC");
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});
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test("Test ADC direct page with 8-bit numbers (m bit is 1)", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fb18e230a90185ffa97f65ff");
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equals(cpu.r.a, 0x80, "0x7f + 0x01 should result in 0x80 when "+
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"using ADC");
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equals(cpu.p.v, 1, "0x7f + 0x01 should set the overflow(v) bit when "+
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"using ADC");
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equals(cpu.p.c, 0, "0x7f + 0x01 should not set the carry(c) bit when "+
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"using ADC");
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equals(cpu.p.z, 0, "0x7f + 0x01 should not set the zero(z) bit when "+
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"using ADC");
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equals(cpu.p.n, 1, "0x7f + 0x01 should set the negative(n) bit when "+
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"using ADC");
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});
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test("Test ADC direct page with 16-bit numbers (m bit is 0)", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fb18c230a9010085ffa9ff7f65ff")
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equals(cpu.r.a, 0x8000, "0x7fff + 0x0001 should result in 0x8000 when "+
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"using ADC");
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equals(cpu.p.v, 1, "0x7fff + 0x0001 should set the overflow(v) bit when "+
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"using ADC");
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equals(cpu.p.c, 0, "0x7fff + 0x0001 should not set the carry(c) bit when "+
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"using ADC");
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equals(cpu.p.z, 0, "0x7fff + 0x0001 should not set the zero(z) bit when "+
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"using ADC");
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equals(cpu.p.n, 1, "0x7fff + 0x0001 should set the negative(n) bit when "+
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"using ADC");
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});
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test("Test ADC absolute with 8-bit numbers (m bit is 1)", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fb18e230a9018dffffa97f6dffff");
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equals(cpu.r.a, 0x80, "0x7f + 0x01 should result in 0x80 when "+
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"using ADC");
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equals(cpu.p.v, 1, "0x7f + 0x01 should set the overflow(v) bit when "+
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"using ADC");
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equals(cpu.p.c, 0, "0x7f + 0x01 should not set the carry(c) bit when "+
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"using ADC");
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equals(cpu.p.z, 0, "0x7f + 0x01 should not set the zero(z) bit when "+
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"using ADC");
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equals(cpu.p.n, 1, "0x7f + 0x01 should set the negative(n) bit when "+
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"using ADC");
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});
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test("Test ADC absolute with 16-bit numbers (m bit is 0)", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fb18c230a901008dffffa9ff7f6dffff")
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equals(cpu.r.a, 0x8000, "0x7fff + 0x0001 should result in 0x8000 when "+
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"using ADC");
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equals(cpu.p.v, 1, "0x7fff + 0x0001 should set the overflow(v) bit when "+
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"using ADC");
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equals(cpu.p.c, 0, "0x7fff + 0x0001 should not set the carry(c) bit when "+
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"using ADC");
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equals(cpu.p.z, 0, "0x7fff + 0x0001 should not set the zero(z) bit when "+
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"using ADC");
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equals(cpu.p.n, 1, "0x7fff + 0x0001 should set the negative(n) bit when "+
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"using ADC");
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});
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}
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function test_branching() {
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