mirror of https://github.com/trudnai/Steve2.git
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
//
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// main.c
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// 6502
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//
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// Created by Tamas Rudnai on 7/14/19.
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// Copyright © 2019 GameAlloy. All rights reserved.
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//
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#ifndef __6502_INSTR_COMPARE_TEST_H__
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#define __6502_INSTR_COMPARE_TEST_H__
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/**
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BIT Test Bits in Memory with Accumulator
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bits 7 and 6 of operand are transfered to bit 7 and 6 of SR (N,V);
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the zeroflag is set to the result of operand AND accumulator.
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A AND M, M7 -> N, M6 -> V N Z C I D V
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M7 + - - - M6
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addressing assembler opc bytes cyles
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--------------------------------------------
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zeropage BIT oper 24 2 3
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absolute BIT oper 2C 3 4
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**/
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INLINE void BIT( uint8_t src ) {
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dbgPrintf("BIT(%02X) ", src);
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disPrintf(disassembly.inst, "BIT");
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set_flags_NV(src);
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set_flags_Z(m6502.A & src);
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}
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/**
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CMP Compare Memory with Accumulator
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A - M N Z C I D V
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+ + + - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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immidiate CMP #oper C9 2 2
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zeropage CMP oper C5 2 3
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zeropage,X CMP oper,X D5 2 4
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absolute CMP oper CD 3 4
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absolute,X CMP oper,X DD 3 4*
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absolute,Y CMP oper,Y D9 3 4*
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(indirect,X) CMP (oper,X) C1 2 6
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(indirect),Y CMP (oper),Y D1 2 5*
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**/
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INLINE void CMP( uint8_t src ) {
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dbgPrintf("CMP(%02X) ", src);
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disPrintf(disassembly.inst, "CMP");
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set_flags_NZC( (int16_t)m6502.A - src );
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}
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/**
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CPX Compare Memory and Index X
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X - M N Z C I D V
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+ + + - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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immidiate CPX #oper E0 2 2
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zeropage CPX oper E4 2 3
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absolute CPX oper EC 3 4
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**/
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INLINE void CPX( uint8_t src ) {
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dbgPrintf("CPX(%02X) ", src);
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disPrintf(disassembly.inst, "CPX");
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set_flags_NZC( (int16_t)m6502.X - src );
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}
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/**
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CPY Compare Memory and Index Y
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Y - M N Z C I D V
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+ + + - - -
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addressing assembler opc bytes cyles
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--------------------------------------------
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immidiate CPY #oper C0 2 2
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zeropage CPY oper C4 2 3
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absolute CPY oper CC 3 4
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**/
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INLINE void CPY( uint8_t src ) {
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dbgPrintf("CPY(%02X) ", src);
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disPrintf(disassembly.inst, "CPY");
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set_flags_NZC( (int16_t)m6502.Y - src );
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}
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#endif // __6502_INSTR_COMPARE_TEST_H__
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