mirror of https://github.com/trudnai/Steve2.git
161 lines
4.2 KiB
C
161 lines
4.2 KiB
C
//
|
|
// main.c
|
|
// 6502
|
|
//
|
|
// Created by Tamas Rudnai on 7/14/19.
|
|
// Copyright © 2019 GameAlloy. All rights reserved.
|
|
//
|
|
|
|
|
|
#ifndef __6502_INSTR_LOAD_STORE_H__
|
|
#define __6502_INSTR_LOAD_STORE_H__
|
|
|
|
#include <ctype.h>
|
|
|
|
/**
|
|
LDA Load Accumulator with Memory
|
|
|
|
M -> A N Z C I D V
|
|
+ + - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
immidiate LDA #oper A9 2 2
|
|
zeropage LDA oper A5 2 3
|
|
zeropage,X LDA oper,X B5 2 4
|
|
absolute LDA oper AD 3 4
|
|
absolute,X LDA oper,X BD 3 4*
|
|
absolute,Y LDA oper,Y B9 3 4*
|
|
(indirect,X) LDA (oper,X) A1 2 6
|
|
(indirect),Y LDA (oper),Y B1 2 5*
|
|
**/
|
|
static inline void LDA( uint8_t imm ) {
|
|
dbgPrintf("LDA ");
|
|
m6502.A = imm;
|
|
set_flags_NZ(imm);
|
|
}
|
|
|
|
/**
|
|
LDX Load Index X with Memory
|
|
|
|
M -> X N Z C I D V
|
|
+ + - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
immidiate LDX #oper A2 2 2
|
|
zeropage LDX oper A6 2 3
|
|
zeropage,Y LDX oper,Y B6 2 4
|
|
absolute LDX oper AE 3 4
|
|
absolute,Y LDX oper,Y BE 3 4*
|
|
**/
|
|
static inline void LDX( uint8_t imm ) {
|
|
dbgPrintf("LDX ");
|
|
m6502.X = imm;
|
|
set_flags_NZ(imm);
|
|
}
|
|
|
|
/**
|
|
LDY Load Index Y with Memory
|
|
|
|
M -> Y N Z C I D V
|
|
+ + - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
immidiate LDY #oper A0 2 2
|
|
zeropage LDY oper A4 2 3
|
|
zeropage,X LDY oper,X B4 2 4
|
|
absolute LDY oper AC 3 4
|
|
absolute,X LDY oper,X BC 3 4*
|
|
**/
|
|
static inline void LDY( uint8_t imm ) {
|
|
dbgPrintf("LDY ");
|
|
m6502.Y = imm;
|
|
set_flags_NZ(imm);
|
|
}
|
|
|
|
|
|
char * charConv =
|
|
"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
|
|
"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
|
|
"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_ !\"#$%&'()*+,-./0123456789:;<=>?"
|
|
"@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~?"
|
|
;
|
|
|
|
|
|
/**
|
|
STR Store Data in Destination
|
|
|
|
(not a real instruction, only a helper function)
|
|
**/
|
|
static inline void STR( uint8_t * dst, uint8_t imm ) {
|
|
*dst = imm;
|
|
|
|
// uint16_t v = dst - RAM;
|
|
|
|
// if ( ( v >= 0x400 ) && ( v < 0x800 ) ) {
|
|
// char c = charConv[imm];
|
|
// if (( imm > ' ' ) && ( c < 0x7F ))
|
|
// printf("%04X: t:%02X '%c'\n", v, imm, isprint(c) ? c : ' ');
|
|
// }
|
|
}
|
|
|
|
/**
|
|
STA Store Accumulator in Memory
|
|
|
|
A -> M N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
zeropage STA oper 85 2 3
|
|
zeropage,X STA oper,X 95 2 4
|
|
absolute STA oper 8D 3 4
|
|
absolute,X STA oper,X 9D 3 5
|
|
absolute,Y STA oper,Y 99 3 5
|
|
(indirect,X) STA (oper,X) 81 2 6
|
|
(indirect),Y STA (oper),Y 91 2 6
|
|
**/
|
|
static inline void STA( uint8_t * dst ) {
|
|
dbgPrintf("STA ");
|
|
STR(dst, m6502.A);
|
|
}
|
|
|
|
/**
|
|
STX Store Index X in Memory
|
|
|
|
X -> M N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
zeropage STX oper 86 2 3
|
|
zeropage,Y STX oper,Y 96 2 4
|
|
absolute STX oper 8E 3 4
|
|
**/
|
|
static inline void STX( uint8_t * dst ) {
|
|
dbgPrintf("STX ");
|
|
STR(dst, m6502.X);
|
|
}
|
|
|
|
/**
|
|
STY Sore Index Y in Memory
|
|
|
|
Y -> M N Z C I D V
|
|
- - - - - -
|
|
|
|
addressing assembler opc bytes cyles
|
|
--------------------------------------------
|
|
zeropage STY oper 84 2 3
|
|
zeropage,X STY oper,X 94 2 4
|
|
absolute STY oper 8C 3 4
|
|
**/
|
|
static inline void STY( uint8_t * dst ) {
|
|
dbgPrintf("STY ");
|
|
STR(dst, m6502.Y);
|
|
}
|
|
|
|
#endif // __6502_INSTR_LOAD_STORE_H__
|
|
|