mirror of
https://github.com/whscullin/apple2js.git
synced 2024-01-12 14:14:38 +00:00
No CPU cycle left behind.
This commit is contained in:
Will Scullin
parent
859bd1ff8f
commit
7d9090133b
@ -314,7 +314,10 @@ export function LoresPage(page, charset, e, context)
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}
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}
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} else {
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if (_80colMode) {
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if (!doubleHiresMode && bank == 1) {
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return;
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}
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if (_80colMode && doubleHiresMode) {
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off = (col * 14 + (bank ? 0 : 1) * 7 + row * 560 * 8 * 2) * 4;
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if (_greenMode) {
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fore = _green;
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240
js/cpu6502.js
240
js/cpu6502.js
@ -163,12 +163,10 @@ export default function CPU6502(options)
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}
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function increment(a) {
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cycles++;
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return testNZ((a + 0x01) & 0xff);
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}
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function decrement(a) {
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cycles++;
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return testNZ((a + 0xff) & 0xff);
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}
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@ -247,15 +245,6 @@ export default function CPU6502(options)
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return (msb << 8) | lsb;
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}
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function indirectBug(addr) {
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var page = addr & 0xff00;
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var off = addr & 0xff;
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var lsb = readByte(page | (off & 0xff));
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var msb = readByte(page | ((off + 0x01) & 0xff));
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return (msb << 8) | lsb;
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}
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/*
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* Read functions
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*/
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@ -280,10 +269,11 @@ export default function CPU6502(options)
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// $0000,X
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function readAbsoluteX() {
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var addr = readWordPC(), oldPage = addr >> 8, page;
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var addr = readWordPC();
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var oldPage = addr >> 8;
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addr = (addr + xr) & 0xffff;
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page = addr >> 8;
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if (page != oldPage) {
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var newPage = addr >> 8;
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if (newPage != oldPage) {
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var off = addr & 0xff;
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readByte(oldPage << 8 | off);
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}
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@ -292,10 +282,11 @@ export default function CPU6502(options)
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// $0000,Y
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function readAbsoluteY() {
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var addr = readWordPC(), oldPage = addr >> 8, page;
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var addr = readWordPC();
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var oldPage = addr >> 8;
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addr = (addr + yr) & 0xffff;
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page = addr >> 8;
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if (page != oldPage) {
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var newPage = addr >> 8;
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if (newPage != oldPage) {
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var off = addr & 0xff;
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readByte(oldPage << 8 | off);
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}
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@ -304,31 +295,33 @@ export default function CPU6502(options)
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// $00,X
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function readZeroPageX() {
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var result = readByte((readBytePC() + xr) & 0xff);
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cycles++;
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return result;
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var zpAddr = readBytePC();
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readByte(zpAddr);
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return readByte((zpAddr + xr) & 0xff);
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}
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// $00,Y
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function readZeroPageY() {
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var addr = (readBytePC() + yr) & 0xff;
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cycles++;
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return readByte(addr);
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var zpAddr = readBytePC();
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readByte(zpAddr);
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return readByte((zpAddr + yr) & 0xff);
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}
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// ($00,X)
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function readZeroPageXIndirect() {
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var addr = readZPWord((readBytePC() + xr) & 0xff);
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cycles++;
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var zpAddr = readBytePC();
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readByte(zpAddr);
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var addr = readZPWord((zpAddr + xr) & 0xff);
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return readByte(addr);
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}
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// ($00),Y
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function readZeroPageIndirectY() {
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var addr = readZPWord(readBytePC()), oldPage = addr >> 8, page;
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var addr = readZPWord(readBytePC());
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var oldPage = addr >> 8;
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addr = (addr + yr) & 0xffff;
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page = addr >> 8;
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if (page != oldPage) {
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var newPage = addr >> 8;
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if (newPage != oldPage) {
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var off = addr & 0xff;
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readByte(oldPage << 8 | off);
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}
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@ -374,23 +367,24 @@ export default function CPU6502(options)
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// $00,X
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function writeZeroPageX(val) {
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var address = (readBytePC() + xr) & 0xff;
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cycles++;
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writeByte(address, val);
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var zpAddr = readBytePC();
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readByte(zpAddr);
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writeByte((zpAddr + xr) & 0xff, val);
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}
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// $00,Y
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function writeZeroPageY(val) {
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var address = (readBytePC() + yr) & 0xff;
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cycles++;
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writeByte(address, val);
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var zpAddr = readBytePC();
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readByte(zpAddr);
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writeByte((zpAddr + yr) & 0xff, val);
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}
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// ($00,X)
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function writeZeroPageXIndirect(val) {
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var address = readZPWord((readBytePC() + xr) & 0xff);
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cycles++;
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writeByte(address, val);
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var zpAddr = readBytePC();
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readByte(zpAddr);
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var addr = readZPWord((zpAddr + xr) & 0xff);
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writeByte(addr, val);
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}
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// ($00),Y
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@ -414,9 +408,9 @@ export default function CPU6502(options)
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// $00,X
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function readAddrZeroPageX() {
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var result = (readBytePC() + xr) & 0xff;
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cycles++;
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return result;
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var zpAddr = readBytePC();
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readByte(zpAddr);
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return (zpAddr + xr) & 0xff;
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}
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// $0000 (65C02)
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@ -426,14 +420,20 @@ export default function CPU6502(options)
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// ($0000) (6502)
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function readAddrAbsoluteIndirectBug() {
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return indirectBug(readWordPC());
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var addr = readWordPC();
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var page = addr & 0xff00;
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var off = addr & 0x00ff;
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var lsb = readByte(addr);
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var msb = readByte(page | ((off + 0x01) & 0xff));
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return msb << 8 | lsb;
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}
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// ($0000) (65C02)
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function readAddrAbsoluteIndirect() {
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var address = readWordPC();
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cycles++;
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return readWord(address);
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var lsb = readBytePC();
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var msb = readBytePC();
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readByte(pc);
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return readWord(msb << 8 | lsb);
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}
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// $0000,X
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@ -442,16 +442,16 @@ export default function CPU6502(options)
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if (!is65C02 || (opts && opts.rwm)) {
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readByte(addr);
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} else {
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cycles++;
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readByte(pc);
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}
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return (addr + xr) & 0xffff;
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}
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// $(0000,X)
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// $(0000,X) (65C02)
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function readAddrAbsoluteXIndirect() {
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var address = (readWordPC() + xr) & 0xffff;
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cycles++;
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return readWord(address);
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var address = readWordPC();
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readByte(pc);
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return readWord((address + xr) & 0xffff);
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}
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/* Break */
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@ -513,108 +513,132 @@ export default function CPU6502(options)
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/* Increment Memory */
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function incA() {
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readByte(pc);
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ar = increment(ar);
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}
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function inc(readAddrFn) {
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var addr = readAddrFn({rwm: true});
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writeByte(addr, increment(readByte(addr)));
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var oldVal = readByte(addr);
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writeByte(addr, oldVal);
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var val = increment(oldVal);
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writeByte(addr, val);
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}
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/* Increment X */
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function inx() {
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readByte(pc);
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xr = increment(xr);
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}
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/* Increment Y */
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function iny() {
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readByte(pc);
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yr = increment(yr);
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}
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/* Decrement Memory */
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function decA() {
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readByte(pc);
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ar = decrement(ar);
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}
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function dec(readAddrFn) {
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var addr = readAddrFn({rwm: true});
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writeByte(addr, decrement(readByte(addr)));
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var oldVal = readByte(addr);
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writeByte(addr, oldVal);
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var val = decrement(oldVal);
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writeByte(addr, val);
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}
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/* Decrement X */
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function dex() {
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readByte(pc);
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xr = decrement(xr);
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}
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/* Decrement Y */
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function dey() {
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readByte(pc);
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yr = decrement(yr);
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}
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function shiftLeft(val) {
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setFlag(flags.C, val & 0x80);
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cycles++;
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return testNZ((val << 1) & 0xff);
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}
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/* Arithmatic Shift Left */
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/* Arithmetic Shift Left */
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function aslA() {
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readByte(pc);
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ar = shiftLeft(ar);
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}
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function asl(readAddrFn) {
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var addr = readAddrFn({rwm: true});
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writeByte(addr, shiftLeft(readByte(addr)));
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var oldVal = readByte(addr);
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writeByte(addr, oldVal);
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var val = shiftLeft(oldVal);
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writeByte(addr, val);
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}
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function shiftRight(val) {
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setFlag(flags.C, val & 0x01);
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cycles++;
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return testNZ(val >> 1);
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}
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/* Logical Shift Right */
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function lsrA() {
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readByte(pc);
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ar = shiftRight(ar);
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}
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function lsr(readAddrFn) {
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var addr = readAddrFn({rwm: true});
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writeByte(addr, shiftRight(readByte(addr)));
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var oldVal = readByte(addr);
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writeByte(addr, oldVal);
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var val = shiftRight(oldVal);
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writeByte(addr, val);
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}
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function rotateLeft(val) {
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var c = (sr & flags.C);
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setFlag(flags.C, val & 0x80);
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cycles++;
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return testNZ(((val << 1) | (c ? 0x01 : 0x00)) & 0xff);
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}
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/* Rotate Left */
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function rolA() {
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readByte(pc);
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ar = rotateLeft(ar);
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}
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function rol(readAddrFn) {
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var addr = readAddrFn({rwm: true});
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writeByte(addr, rotateLeft(readByte(addr)));
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var oldVal = readByte(addr);
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writeByte(oldVal);
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var val = rotateLeft(oldVal);
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writeByte(addr, val);
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}
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function rotateRight(a) {
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var c = (sr & flags.C);
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setFlag(flags.C, a & 0x01);
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cycles++;
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return testNZ((a >> 1) | (c ? 0x80 : 0x00));
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}
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/* Rotate Right */
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function rorA() {
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readByte(pc);
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ar = rotateRight(ar);
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}
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function ror(readAddrFn) {
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var addr = readAddrFn({rwm: true});
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writeByte(addr, rotateRight(readByte(addr)));
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var oldVal = readByte(addr);
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writeByte(addr, val);
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var val = rotateRight(oldVal);
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writeByte(addr, val);
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}
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/* Logical And Accumulator */
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@ -638,8 +662,8 @@ export default function CPU6502(options)
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var bit = (0x1 << b) ^ 0xFF;
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var addr = readBytePC();
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var val = readByte(addr);
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readByte(addr);
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val &= bit;
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cycles++;
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writeByte(addr, val);
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}
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@ -649,26 +673,26 @@ export default function CPU6502(options)
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var bit = 0x1 << b;
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var addr = readBytePC();
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var val = readByte(addr);
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readByte(addr);
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val |= bit;
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cycles++;
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writeByte(addr, val);
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}
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/* Test and Reset Bits */
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function trb(readAddrFn) {
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var addr = readAddrFn(),
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val = readByte(addr);
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var addr = readAddrFn();
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var val = readByte(addr);
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testZ(val & ar);
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cycles++;
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readByte(addr);
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writeByte(addr, val & ~ar);
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}
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/* Test and Set Bits */
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function tsb(readAddrFn) {
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var addr = readAddrFn(),
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val = readByte(addr);
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var addr = readAddrFn();
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var val = readByte(addr);
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testZ(val & ar);
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cycles++;
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readByte(addr);
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writeByte(addr, val | ar);
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}
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@ -710,71 +734,93 @@ export default function CPU6502(options)
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function brs(f) {
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var off = readBytePC(); // changes pc
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if ((f & sr) !== 0) {
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var oldPC = pc;
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readByte(pc);
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var oldPage = pc >> 8;
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pc += off > 127 ? off - 256 : off;
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cycles++;
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if ((pc >> 8) != (oldPC >> 8)) cycles++;
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var newPage = pc >> 8;
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var newOff = pc & 0xff;
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if (newPage != oldPage) readByte(oldPage << 8 | newOff);
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}
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}
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function brc(f) {
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var off = readBytePC(); // changes pc
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if ((f & sr) === 0) {
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var oldPC = pc;
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readByte(pc);
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var oldPage = pc >> 8;
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pc += off > 127 ? off - 256 : off;
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cycles++;
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if ((pc >> 8) != (oldPC >> 8)) cycles++;
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var newPage = pc >> 8;
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var newOff = pc & 0xff;
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if (newPage != oldPage) readByte(oldPage << 8 | newOff);
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}
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}
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/* WDC 65C02 branches */
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function bbr(b) {
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var val = readZeroPage();
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var zpAddr = readBytePC();
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var val = readByte(zpAddr);
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readByte(zpAddr);
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var off = readBytePC(); // changes pc
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cycles++;
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if (((1 << b) & val) === 0) {
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var oldPc = pc;
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var oldPage = oldPc >> 8;
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readByte(oldPc);
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pc += off > 127 ? off - 256 : off;
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var newPage = pc >> 8;
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if (oldPage != newPage) {
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readByte(oldPc);
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}
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}
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}
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function bbs(b) {
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var val = readZeroPage(); // ZP
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var zpAddr = readBytePC();
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var val = readByte(zpAddr);
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readByte(zpAddr);
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var off = readBytePC(); // changes pc
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cycles++;
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if (((1 << b) & val) !== 0) {
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var oldPc = pc;
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var oldPage = oldPc >> 8;
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readByte(oldPc);
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pc += off > 127 ? off - 256 : off;
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var newPage = pc >> 8;
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if (oldPage != newPage) {
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readByte(oldPc);
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}
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}
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}
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/* Transfers and stack */
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function tax() { testNZ(xr = ar); cycles++; }
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function tax() { readByte(pc); testNZ(xr = ar); }
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function txa() { testNZ(ar = xr); cycles++; }
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function txa() { readByte(pc); testNZ(ar = xr); }
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function tay() { testNZ(yr = ar); cycles++; }
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function tay() { readByte(pc); testNZ(yr = ar); }
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function tya() { testNZ(ar = yr); cycles++; }
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function tya() { readByte(pc); testNZ(ar = yr); }
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function tsx() { testNZ(xr = sp); cycles++; }
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function tsx() { readByte(pc); testNZ(xr = sp); }
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function txs() { sp = xr; cycles++; }
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function txs() { readByte(pc); sp = xr; }
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function pha() { cycles++; pushByte(ar); }
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function pha() { readByte(pc); pushByte(ar); }
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function pla() { cycles++; readByte(0x0100 | sp); testNZ(ar = pullByte()); }
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function pla() { readByte(pc); readByte(0x0100 | sp); testNZ(ar = pullByte()); }
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function phx() { cycles++; pushByte(xr); }
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function phx() { readByte(pc); pushByte(xr); }
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function plx() { cycles++; readByte(0x0100 | sp);testNZ(xr = pullByte()); }
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function plx() { readByte(pc); readByte(0x0100 | sp);testNZ(xr = pullByte()); }
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function phy() { cycles++; pushByte(yr); }
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function phy() { readByte(pc); pushByte(yr); }
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function ply() { cycles++; readByte(0x0100 | sp); testNZ(yr = pullByte()); }
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function ply() { readByte(pc); readByte(0x0100 | sp); testNZ(yr = pullByte()); }
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|
||||
function php() { cycles++; pushByte(sr | flags.B); }
|
||||
function php() { readByte(pc); pushByte(sr | flags.B); }
|
||||
|
||||
function plp() { cycles++; readByte(0x0100 | sp); sr = (pullByte() & ~flags.B) | 0x20; }
|
||||
function plp() { readByte(pc); readByte(0x0100 | sp); sr = (pullByte() & ~flags.B) | 0x20; }
|
||||
|
||||
/* Jump */
|
||||
function jmp(readAddrFn) {
|
||||
@ -792,7 +838,7 @@ export default function CPU6502(options)
|
||||
|
||||
/* Return from Subroutine */
|
||||
function rts() {
|
||||
cycles++;
|
||||
readByte(pc);
|
||||
readByte(0x0100 | sp);
|
||||
var addr = pullWordRaw();
|
||||
readByte(addr);
|
||||
@ -801,7 +847,7 @@ export default function CPU6502(options)
|
||||
|
||||
/* Return from Subroutine */
|
||||
function rti() {
|
||||
cycles++;
|
||||
readByte(pc);
|
||||
readByte(0x0100 | sp);
|
||||
sr = pullByte() & ~flags.B;
|
||||
pc = pullWordRaw();
|
||||
@ -809,19 +855,19 @@ export default function CPU6502(options)
|
||||
|
||||
/* Set and Clear */
|
||||
function set(flag) {
|
||||
readByte(pc);
|
||||
sr |= flag;
|
||||
cycles++;
|
||||
}
|
||||
|
||||
function clr(flag) {
|
||||
readByte(pc);
|
||||
sr &= ~flag;
|
||||
cycles++;
|
||||
}
|
||||
|
||||
/* No-Op */
|
||||
function nop(readAddrFn) {
|
||||
readByte(pc);
|
||||
readAddrFn();
|
||||
cycles++;
|
||||
}
|
||||
|
||||
var ops = {
|
||||
|
||||
@ -1785,7 +1785,7 @@ describe('65c02', function() {
|
||||
it('BBR0 should branch if bit 0 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xFE]]]);
|
||||
testCode([0x0F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1793,7 +1793,7 @@ describe('65c02', function() {
|
||||
it('BBR0 should branch backward', function () {
|
||||
initMemory([[0x00, 0x33, [0xFE]]]);
|
||||
testCode([0x0F, 0x33, 0xFF], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0402
|
||||
});
|
||||
});
|
||||
@ -1801,7 +1801,7 @@ describe('65c02', function() {
|
||||
it('BBR1 should branch if bit 1 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xFD]]]);
|
||||
testCode([0x1F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1809,7 +1809,7 @@ describe('65c02', function() {
|
||||
it('BBR2 should branch if bit 2 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xFB]]]);
|
||||
testCode([0x2F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1817,7 +1817,7 @@ describe('65c02', function() {
|
||||
it('BBR3 should branch if bit 3 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xF7]]]);
|
||||
testCode([0x3F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1825,7 +1825,7 @@ describe('65c02', function() {
|
||||
it('BBR4 should branch if bit 4 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xEF]]]);
|
||||
testCode([0x4F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1833,7 +1833,7 @@ describe('65c02', function() {
|
||||
it('BBR5 should branch if bit 5 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xDF]]]);
|
||||
testCode([0x5F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1841,7 +1841,7 @@ describe('65c02', function() {
|
||||
it('BBR6 should branch if bit 6 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0xBF]]]);
|
||||
testCode([0x6F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1849,7 +1849,7 @@ describe('65c02', function() {
|
||||
it('BBR7 should branch if bit 7 clear', function() {
|
||||
initMemory([[0x00, 0x33, [0x7F]]]);
|
||||
testCode([0x7F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1922,7 +1922,7 @@ describe('65c02', function() {
|
||||
it('BBS0 should branch if bit 0 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x01]]]);
|
||||
testCode([0x8F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1930,7 +1930,7 @@ describe('65c02', function() {
|
||||
it('BBS0 should branch backward', function () {
|
||||
initMemory([[0x00, 0x33, [0x01]]]);
|
||||
testCode([0x8F, 0x33, 0xFF], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0402
|
||||
});
|
||||
});
|
||||
@ -1938,7 +1938,7 @@ describe('65c02', function() {
|
||||
it('BBS1 should branch if bit 1 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x02]]]);
|
||||
testCode([0x9F, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1946,7 +1946,7 @@ describe('65c02', function() {
|
||||
it('BBS2 should branch if bit 2 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x04]]]);
|
||||
testCode([0xAF, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1954,7 +1954,7 @@ describe('65c02', function() {
|
||||
it('BBS3 should branch if bit 3 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x08]]]);
|
||||
testCode([0xBF, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1962,7 +1962,7 @@ describe('65c02', function() {
|
||||
it('BBS4 should branch if bit 4 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x10]]]);
|
||||
testCode([0xCF, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1970,7 +1970,7 @@ describe('65c02', function() {
|
||||
it('BBS5 should branch if bit 5 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x20]]]);
|
||||
testCode([0xDF, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1978,7 +1978,7 @@ describe('65c02', function() {
|
||||
it('BBS6 should branch if bit 6 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x40]]]);
|
||||
testCode([0xEF, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
@ -1986,7 +1986,7 @@ describe('65c02', function() {
|
||||
it('BBS7 should branch if bit 7 set', function() {
|
||||
initMemory([[0x00, 0x33, [0x80]]]);
|
||||
testCode([0xFF, 0x33, 0x7F], 1, {}, {
|
||||
cycles: 5,
|
||||
cycles: 6,
|
||||
pc: 0x0482
|
||||
});
|
||||
});
|
||||
|
||||
Loading…
Reference in New Issue
Block a user