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More 8080 opcodes

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This commit is contained in:
Jeff Parsons 2016-04-24 07:26:33 -07:00
commit ccc71d4508
4 changed files with 469 additions and 237 deletions
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41
modules/pc8080/lib/cpusim.js
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@ -777,6 +777,47 @@ CPUSim.prototype.addByteCarry = function(dst, src)
return (this.resultZeroCarry = this.resultParitySign = dst + src + ((this.resultZeroCarry & 0x100)? 1 : 0)) & 0xff;
};
/**
* subByte(dst, src)
*
* @this {CPUSim}
* @param {number} dst
* @param {number} src
* @return {number} dst - src
*/
CPUSim.prototype.subByte = function(dst, src)
{
this.resultAuxOverflow = dst ^ src;
return (this.resultZeroCarry = this.resultParitySign = dst - src) & 0xff;
};
/**
* subByteBorrow(dst, src)
*
* @this {CPUSim}
* @param {number} dst
* @param {number} src
* @return {number} dst - src - carry
*/
CPUSim.prototype.subByteBorrow = function(dst, src)
{
this.resultAuxOverflow = dst ^ src;
return (this.resultZeroCarry = this.resultParitySign = dst - src - ((this.resultZeroCarry & 0x100)? 1 : 0)) & 0xff;
};
/**
* andByte(dst, src)
*
* @this {CPUSim}
* @param {number} dst
* @param {number} src
* @return {number} dst & src
*/
CPUSim.prototype.andByte = function(dst, src)
{
return this.resultZeroCarry = this.resultParitySign = this.resultAuxOverflow = dst & src;
};
/**
* getByte(addr)
*