72 lines
3.3 KiB
C
72 lines
3.3 KiB
C
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/*****************************************************************************/
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/* */
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/* cpucore.h */
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/* */
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/* CPU core for the 6502 simulator */
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/* */
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/* */
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/* */
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/* (C) 2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef CPUCORE_H
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#define CPUCORE_H
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Registers */
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extern unsigned char AC; /* Accumulator */
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extern unsigned char XR; /* X register */
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extern unsigned char YR; /* Y register */
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extern unsigned char SR; /* Status register */
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extern unsigned char SP; /* Stackpointer */
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extern unsigned PC; /* Program counter */
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/* Status register bits */
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#define CF 0x01 /* Carry flag */
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#define ZF 0x02 /* Zero flag */
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#define IF 0x04 /* Interrupt flag */
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#define DF 0x08 /* Decimal flag */
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#define BF 0x10 /* Break flag */
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#define OF 0x40 /* Overflow flag */
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#define SF 0x80 /* Sign flag */
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/* End of cpucore.h */
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#endif
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