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180 lines
4.6 KiB
C
180 lines
4.6 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_LOAD_STORE_H__
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#define __6502_INSTR_LOAD_STORE_H__
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#include <ctype.h>
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/**
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LDA Load Accumulator with Memory
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M -> A 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 LDA #oper A9 2 2
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zeropage LDA oper A5 2 3
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zeropage,X LDA oper,X B5 2 4
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absolute LDA oper AD 3 4
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absolute,X LDA oper,X BD 3 4*
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absolute,Y LDA oper,Y B9 3 4*
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(indirect,X) LDA (oper,X) A1 2 6
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(indirect),Y LDA (oper),Y B1 2 5*
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**/
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static inline void LDA( uint8_t imm ) {
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dbgPrintf("LDA(%02X) ", imm);
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m6502.A = imm;
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set_flags_NZ(imm);
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}
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/**
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LDX Load Index X with Memory
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M -> X 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 LDX #oper A2 2 2
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zeropage LDX oper A6 2 3
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zeropage,Y LDX oper,Y B6 2 4
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absolute LDX oper AE 3 4
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absolute,Y LDX oper,Y BE 3 4*
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**/
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static inline void LDX( uint8_t imm ) {
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dbgPrintf("LDX(%02X) ", imm);
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m6502.X = imm;
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set_flags_NZ(imm);
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}
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/**
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LDY Load Index Y with Memory
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M -> Y 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 LDY #oper A0 2 2
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zeropage LDY oper A4 2 3
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zeropage,X LDY oper,X B4 2 4
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absolute LDY oper AC 3 4
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absolute,X LDY oper,X BC 3 4*
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**/
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static inline void LDY( uint8_t imm ) {
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dbgPrintf("LDY(%02X) ", imm);
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m6502.Y = imm;
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set_flags_NZ(imm);
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}
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char * charConv =
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"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
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"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
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"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
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"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"
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;
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/**
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STR Store Data in Destination
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(not a real instruction, only a helper function)
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**/
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static inline void STR( uint8_t * dst, uint8_t imm ) {
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*dst = imm;
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// uint16_t v = dst - RAM;
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// if ( ( v >= 0x400 ) && ( v < 0x800 ) ) {
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// char c = charConv[imm];
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//// if ( c == '?' ) {
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//// printf("? SYNTAX ERROR\n");
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//// }
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//
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// if (( imm > ' ' ) && ( c < 0x7F ))
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// printf("*** PRINT: %04X: t:%02X '%c'\n", v, imm, isprint(c) ? c : ' ');
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// }
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//
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//
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// else switch ( v ) {
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// case 0x36:
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// case 0x37:
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// dbgPrintf("*** OUTROUT %04X: %02X\n", v, imm);
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// break;
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//
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// case 0x9B:
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// case 0x9C:
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// dbgPrintf("*** LOWTR %04X: %02X\n", v, imm);
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// break;
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//
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// default:
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// break;
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// }
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}
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/**
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STA Store Accumulator in Memory
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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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zeropage STA oper 85 2 3
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zeropage,X STA oper,X 95 2 4
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absolute STA oper 8D 3 4
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absolute,X STA oper,X 9D 3 5
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absolute,Y STA oper,Y 99 3 5
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(indirect,X) STA (oper,X) 81 2 6
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(indirect),Y STA (oper),Y 91 2 6
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**/
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static inline void STA( uint8_t * dst ) {
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dbgPrintf("STA ");
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STR(dst, m6502.A);
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}
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/**
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STX Store Index X in Memory
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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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zeropage STX oper 86 2 3
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zeropage,Y STX oper,Y 96 2 4
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absolute STX oper 8E 3 4
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**/
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static inline void STX( uint8_t * dst ) {
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dbgPrintf("STX ");
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STR(dst, m6502.X);
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}
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/**
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STY Sore Index Y in Memory
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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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zeropage STY oper 84 2 3
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zeropage,X STY oper,X 94 2 4
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absolute STY oper 8C 3 4
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**/
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static inline void STY( uint8_t * dst ) {
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dbgPrintf("STY ");
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STR(dst, m6502.Y);
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}
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#endif // __6502_INSTR_LOAD_STORE_H__
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