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https://github.com/mist64/perfect6502.git
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33 lines
840 B
C
33 lines
840 B
C
extern unsigned char RAM[65536];
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extern unsigned char A, X, Y, S;
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extern unsigned short PC;
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extern unsigned char V, B, D, I, C, N, Z;
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#define SETZ(a) Z=a;
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#define SETSZ(a) Z = (a)? 0:1; N = ((signed char)(a))<0?1:0
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#define SETNC(a) C = (a)&0x100? 0:1
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#define SETV(a) /* not needed */
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#define STACK16(i) (RAM[0x0100+i]|(RAM[0x0100+i+1]<<8))
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#define PUSH(b) RAM[0x0100+S--] = (b)
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#define PUSH_WORD(b) PUSH((b)>>8); PUSH((b)&0xFF)
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void CHRGET(void);
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void CHRGOT(void);
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int main(int, char **);
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#define VEC_ERROR 0x0300
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#define VEC_MAIN 0x0302
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#define VEC_CRNCH 0x0304
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#define VEC_QPLOP 0x0306
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#define VEC_GONE 0x0308
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#define VEC_EVAL 0x030A
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#define MAGIC_ERROR 0xFF00
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#define MAGIC_MAIN 0xFF01
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#define MAGIC_CRNCH 0xFF02
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#define MAGIC_QPLOP 0xFF03
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#define MAGIC_GONE 0xFF04
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#define MAGIC_EVAL 0xFF05
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#define MAGIC_CONTINUATION 0xFFFF
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