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https://github.com/pskupinski/65816.js.git
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added decimal mode support for SBC, wrote unit tests to verify that support and updated the TODO
This commit is contained in:
Preston Skupinski
parent
b505f7a50d
commit
d902611e9c
8
TODO
8
TODO
@ -3,14 +3,14 @@ Testing:
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- More tests for CMP/CPY/CPX operations
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- Tests needed for JMP operations
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- Tests needed for LD* and ST* operations
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- Tests needed for bank/page wrapping
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- Tests needed for IN* and DE* operations
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- Tests needed for T** transfer operations
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- Tests needed for interrupt support
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- Tests needed for the numerous other operations added
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CPU:
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- More work on interrupts
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- Decimal mode support(figure out details as to how it handles illegal BCD
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numbers)
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- Figure out the exact details of how the 65816 handles illegal BCD numbers
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when decimal mode is set
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- Have each operation return the number of cycles used by the execute function.
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- Optimization
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Memory:
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@ -18,8 +18,6 @@ Memory:
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settings
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- Page wrapping or not wrapping for certain addressing modes and with certain
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settings
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- ROM protection
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- Improve the memory mapped I/O interface and handling
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Display:
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- Add the ability to step, pause and stop execution
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- Ability to view the path of operation execution as it executes, like have
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127
cpu.js
127
cpu.js
@ -3227,44 +3227,109 @@ var SBC_const = {
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},
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execute:function(cpu, bytes) {
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var old_a = cpu.r.a;
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if(cpu.p.e|cpu.p.m) {
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cpu.r.a -= bytes[0] - cpu.p.c;
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if(cpu.r.a < 0) {
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cpu.p.c = 0;
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cpu.r.a = 0x100 + cpu.r.a;
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} else {
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cpu.p.c = 1;
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}
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cpu.p.n = cpu.r.a >> 7;
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var temp = 0;
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if(cpu.p.c===0)
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temp = 1;
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// Check for signed overflow.
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// If they started with the same sign and then the resulting sign is
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// different then we have a signed overflow.
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if((!((old_a ^ bytes[0]) & 0x80)) && ((cpu.r.a ^ old_a) & 0x80)) {
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cpu.p.v = 1;
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if(cpu.p.e|cpu.p.m) {
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if(cpu.p.d) {
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// Form a decimal number out of a.
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var ones = cpu.r.a & 0x0f;
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var tens = cpu.r.a >> 4;
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var dec_a = (tens*10)+ones;
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// Form a decimal number out of the argument.
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ones = bytes[0] & 0x0f;
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tens = bytes[0] >> 4;
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var dec_arg = (tens*10)+ones;
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var result = dec_a - dec_arg - temp;
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// Check for decimal overflow.
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if(result<0) {
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result += 100;
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cpu.p.c = 0;
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} else {
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cpu.p.c = 1;
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}
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var digits = result.toString(10).split("");
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var i = 0;
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cpu.r.a = 0;
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for(i=0;i<digits.length;i++) {
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cpu.r.a += (digits[i]-0)*Math.pow(16,digits.length-i-1);
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}
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} else {
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cpu.p.v = 0;
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cpu.r.a -= bytes[0] - temp;
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if(cpu.r.a < 0) {
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cpu.p.c = 0;
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cpu.r.a = 0x100 + cpu.r.a;
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} else {
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cpu.p.c = 1;
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}
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cpu.p.n = cpu.r.a >> 7;
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// Check for signed overflow.
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// If they started with the same sign and then the resulting sign is
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// different then we have a signed overflow.
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if((!((old_a ^ bytes[0]) & 0x80)) && ((cpu.r.a ^ old_a) & 0x80)) {
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cpu.p.v = 1;
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} else {
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cpu.p.v = 0;
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}
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}
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} else {
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var argument = (bytes[1]<<8)|bytes[0];
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cpu.r.a -= argument - cpu.p.c;
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if(cpu.r.a < 0) {
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cpu.p.c = 0;
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cpu.r.a = 0x10000 + cpu.r.a;
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} else {
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cpu.p.c = 1;
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}
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cpu.p.n = cpu.r.a >> 15;
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var temp = 0;
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if(cpu.p.c===0)
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temp = 1;
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// Check for signed overflow.
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// If they started with the same sign and then the resulting sign is
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// different then we have a signed overflow.
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if((!((old_a ^ argument) & 0x8000)) && ((cpu.r.a ^ old_a) & 0x8000)) {
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cpu.p.v = 1;
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if(cpu.p.d) {
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// Form a decimal number out of a.
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var ones = cpu.r.a & 0xf;
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var tens = (cpu.r.a >>4) & 0xf;
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var hundreds = (cpu.r.a >> 8) & 0xf;
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var thousands = (cpu.r.a >> 12) & 0xf;
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var dec_a = (thousands*1000)+(hundreds*100)+(tens*10)+ones;
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// Form a decimal number out of the argument.
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ones = argument & 0xf;
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tens = (argument >> 4) & 0xf;
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hundreds = (argument >> 8) & 0xf;
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thousands = (argument >> 12) & 0xf;
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var dec_arg = (thousands*1000)+(hundreds*100)+(tens*10)+ones;
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var result = dec_a - dec_arg - temp;
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// Check for decimal overflow.
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if(result<0) {
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result += 10000;
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cpu.p.c = 0;
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} else {
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cpu.p.c = 1;
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}
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var digits = result.toString(10).split("");
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var i = 0;
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cpu.r.a = 0;
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for(i=0;i<digits.length;i++) {
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cpu.r.a += (digits[i]-0)*Math.pow(16,digits.length-i-1);
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}
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} else {
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cpu.p.v = 0;
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}
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}
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cpu.r.a -= argument - temp;
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if(cpu.r.a < 0) {
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cpu.p.c = 0;
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cpu.r.a = 0x10000 + cpu.r.a;
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} else {
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cpu.p.c = 1;
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}
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cpu.p.n = cpu.r.a >> 15;
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// Check for signed overflow.
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// If they started with the same sign and then the resulting sign is
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// different then we have a signed overflow.
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if((!((old_a ^ argument) & 0x8000)) && ((cpu.r.a ^ old_a) & 0x8000)) {
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cpu.p.v = 1;
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} else {
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cpu.p.v = 0;
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}
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}
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}
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if(cpu.r.a===0) {
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cpu.p.z = 1;
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@ -373,7 +373,7 @@ function test_sbc() {
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test("Test normal subtraction of two 8-bit numbers that don't cause a "+
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"borrow.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbe23018a901e901");
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cpu.execute("18fbe230a90138e901");
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equals(cpu.r.a, 0, "0x01 - 0x01 should result in zero when using "+
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"SBC");
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equals(cpu.p.z, 1, "0x01 - 0x01 should set the zero(z) bit when "+
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@ -389,7 +389,7 @@ function test_sbc() {
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test("Test normal subtraction of two 16-bit numbers that don't cause a "+
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"borrow.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbc23018a90100e90100");
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cpu.execute("18fbc230a9010038e90100");
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equals(cpu.r.a, 0, "0x0001 - 0x0001 should result in zero when using "+
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"SBC");
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equals(cpu.p.z, 1, "0x0001 - 0x0001 should set the zero(z) bit when "+
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@ -404,7 +404,7 @@ function test_sbc() {
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test("Test subtraction that triggers a borrow with 8-bit numbers",
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function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbe23018a9d0e9ef");
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cpu.execute("18fbe230a9d038e9ef");
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equals(cpu.r.a, 0xe1, "0xd0 - 0xef should set the accumulator to 0xe1 "+
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"when using SBC");
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equals(cpu.p.n, 1, "0xd0 - 0xef should set the negative(n) bit when "+
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@ -419,7 +419,7 @@ function test_sbc() {
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test("Test subtraction that triggers a borrow with 16-bit numbers",
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function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbc23018a900d0e900ef");
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cpu.execute("18fbc230a900d038e900ef");
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equals(cpu.r.a, 0xe100, "0xd000 - 0xef00 should set the accumulator to "+
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"0xe0ff when using SBC");
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equals(cpu.p.n, 1, "0xd000 - 0xef00 should set the negative(n) bit when "+
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@ -431,6 +431,90 @@ function test_sbc() {
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equals(cpu.p.c, 0, "0xd000 - 0xef00 should not set the carry(c) bit when "+
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"using SBC");
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});
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test("Test subtraction with decimal mode on with two single digit 8-bit "+
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"numbers.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbf8a90938e905");
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equals(cpu.r.a, 4, "The accumulator should be 4 after subtracting 0x5 "+
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"0x9 with decimal mode on with 8-bit "+
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"memory/accumulator mode.");
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equals(cpu.p.c, 1, "The carry bit should be set after no borrow is "+
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"triggered.");
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equals(cpu.p.m, 1, "The m flag of the p status register should be one "+
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"for 8-bit memory/accumulator mode.");
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equals(cpu.p.e, 0, "The hidden e flag of the p status register should "+
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"be zero for native mode.");
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});
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test("Test subtraction with decimal mode on with two double digit 8-bit "+
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"numbers.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbf8a99038e949");
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equals(cpu.r.a, 0x41, "The accumulator should be 41 after subtracting 0x49 "+
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"from 0x90 with decimal mode on with 8-bit "+
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"memory/accumulator mode.");
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equals(cpu.p.c, 1, "The carry bit should be set after no borrow is "+
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"triggered.");
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equals(cpu.p.m, 1, "The m flag of the p status register should be one "+
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"for 8-bit memory/accumulator mode.");
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equals(cpu.p.e, 0, "The hidden e flag of the p status register should "+
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"be zero for native mode.");
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});
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test("Test subtraction with decimal mode on with 8-bit numbers that causes "+
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"a borrow.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbf8a91038e920");
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equals(cpu.r.a, 0x90, "The accumulator should be 0x90 after subtracting "+
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"0x20 from 0x10 with decimal and 8-bit "+
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"memory/accumulator modes.");
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equals(cpu.p.c, 0, "The carry bit should be clear after a borrow is "+
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"triggered.");
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equals(cpu.p.m, 1, "The m flag of the p status register should be one "+
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"for 8-bit memory/accumulator mode.");
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equals(cpu.p.e, 0, "The hidden e flag of the p status register should "+
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"be zero for native mode.");
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});
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test("Test subtraction of two single digit 16-bit numbers with decimal "+
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"mode set.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbc220f8a9050038e90200");
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equals(cpu.r.a, 0x03, "The accumulator should be 0x03 after subtracting "+
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"0x02 from 0x05 with decimal and 16-bit "+
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"memory/accumulator modes.");
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equals(cpu.p.c, 1, "The carry bit should be set after no borrow is "+
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"triggered.");
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equals(cpu.p.m, 0, "The m flag of the p status register should be zero "+
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"for 16-bit memory/accumulator mode.");
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equals(cpu.p.e, 0, "The hidden e flag of the p status register should "+
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"be zero for native mode.");
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});
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test("Test subtraction of two four digit 16-bit numbers with decimal "+
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"mode set.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbc220f8a9999938e91111");
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equals(cpu.r.a, 0x8888, "The accumulator should be 0x8888 after "+
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"subtracting 0x1111 from 0x9999 with decimal "+
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"and 16-bit memory/accumulator modes.");
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equals(cpu.p.c, 1, "The carry bit should be set after no borrow is "+
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"triggered.");
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equals(cpu.p.m, 0, "The m flag of the p status register should be zero "+
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"for 16-bit memory/accumulator mode.");
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equals(cpu.p.e, 0, "The hidden e flag of the p status register should "+
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"be zero for native mode.");
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});
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test("Test subtraction of two four digit 16-bit numbers with decimal "+
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"mode set that causes a borrow.", function() {
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var cpu = new CPU_65816();
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cpu.execute("18fbc220f8a9111138e99999");
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equals(cpu.r.a, 0x1112, "The accumulator should be 0x1112 after "+
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"subtracting 0x9999 from 0x1111 with decimal "+
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"and 16-bit memory/accumulator modes.");
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equals(cpu.p.c, 0, "The carry bit should be clear after a borrow is "+
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"triggered.");
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equals(cpu.p.m, 0, "The m flag of the p status register should be zero "+
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"for 16-bit memory/accumulator mode.");
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equals(cpu.p.e, 0, "The hidden e flag of the p status register should "+
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"be zero for native mode.");
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});
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}
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function test_adc() {
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