libsidplayfp  1.1.0
SystemRAMBank.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2012-2013 Leandro Nini <drfiemost@users.sourceforge.net>
5  * Copyright 2010 Antti Lankila
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
20  */
21 
22 #ifndef SYSTEMRAMBANK_H
23 #define SYSTEMRAMBANK_H
24 
25 #include <string.h>
26 #include <stdint.h>
27 
28 #include "Bank.h"
29 
35 class SystemRAMBank : public Bank
36 {
37  friend class MMU;
38 
39 private:
41  uint8_t ram[0x10000];
42 
43 public:
45  void reset()
46  {
47  memset(ram, 0, 0x10000);
48  for (int i = 0x07c0; i < 0x10000; i += 128)
49  {
50  memset(ram+i, 0xff, 64);
51  }
52  }
53 
54  uint8_t peek(uint_least16_t address)
55  {
56  return ram[address];
57  }
58 
59  void poke(uint_least16_t address, uint8_t value)
60  {
61  ram[address] = value;
62  }
63 };
64 
65 #endif