FabGL
ESP32 Display Controller and Graphics Library
MOS6502.h
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1/*
2 Created by Fabrizio Di Vittorio (fdivitto2013@gmail.com) - <http://www.fabgl.com>
3 Copyright (c) 2019-2022 Fabrizio Di Vittorio.
4 All rights reserved.
5
6
7* Please contact fdivitto2013@gmail.com if you need a commercial license.
8
9
10* This library and related software is available under GPL v3.
11
12 FabGL is free software: you can redistribute it and/or modify
13 it under the terms of the GNU General Public License as published by
14 the Free Software Foundation, either version 3 of the License, or
15 (at your option) any later version.
16
17 FabGL is distributed in the hope that it will be useful,
18 but WITHOUT ANY WARRANTY; without even the implied warranty of
19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 GNU General Public License for more details.
21
22 You should have received a copy of the GNU General Public License
23 along with FabGL. If not, see <http://www.gnu.org/licenses/>.
24 */
25
26
27#pragma once
28
29
38#include <stdint.h>
39
40
41
42namespace fabgl {
43
44
45
49class MOS6502 {
50
51public:
52
53 // callbacks
54 typedef int (*ReadByteCallback)(void * context, int addr);
55 typedef void (*WriteByteCallback)(void * context, int addr, int value);
56 typedef int (*Page0ReadByteCallback)(void * context, int addr);
57 typedef void (*Page0WriteByteCallback)(void * context, int addr, int value);
58 typedef int (*Page1ReadByteCallback)(void * context, int addr);
59 typedef void (*Page1WriteByteCallback)(void * context, int addr, int value);
60
61
62 void setCallbacks(void * context, ReadByteCallback readByte, WriteByteCallback writeByte, Page0ReadByteCallback page0ReadByte, Page0WriteByteCallback page0WriteByte, Page1ReadByteCallback page1ReadByte, Page1WriteByteCallback page1WriteByte) {
63 m_context = context;
64 m_readByte = readByte;
65 m_writeByte = writeByte;
66 m_page0ReadByte = page0ReadByte;
67 m_page0WriteByte = page0WriteByte;
68 m_page1ReadByte = page1ReadByte;
69 m_page1WriteByte = page1WriteByte;
70 }
71
72 int reset();
73 int IRQ();
74 int NMI();
75
76 void setPC(uint16_t addr) { m_PC = addr; }
77 uint16_t getPC() { return m_PC; }
78
79 int step();
80
81private:
82
83 typedef void (MOS6502::*ADCSBC)(uint8_t);
84
85 void OP_BINADC(uint8_t m);
86 void OP_BINSBC(uint8_t m);
87
88 void OP_BCDADC(uint8_t m);
89 void OP_BCDSBC(uint8_t m);
90
91 void setADCSBC();
92
93
94 ADCSBC m_OP_ADC;
95 ADCSBC m_OP_SBC;
96
97 uint16_t m_PC;
98 uint8_t m_A;
99 uint8_t m_X;
100 uint8_t m_Y;
101 uint8_t m_SP;
102
103 bool m_carry;
104 bool m_zero;
105 bool m_intDisable;
106 bool m_decimal;
107 bool m_overflow;
108 bool m_negative;
109
110 void * m_context;
111 ReadByteCallback m_readByte;
112 WriteByteCallback m_writeByte;
113 Page0ReadByteCallback m_page0ReadByte;
114 Page0WriteByteCallback m_page0WriteByte;
115 Page1ReadByteCallback m_page1ReadByte;
116 Page1WriteByteCallback m_page1WriteByte;
117
118};
119
120}; // namespace fabgl
fabgl::MOS6502
MOS 6502 CPU emulator.
Definition: MOS6502.h:49