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1 /*****************************************************************************/
2 /*                                                                           */
3 /*                                 memory.h                                  */
4 /*                                                                           */
5 /*                  Memory subsystem for the 6502 simulator                  */
6 /*                                                                           */
7 /*                                                                           */
8 /*                                                                           */
9 /* (C) 2002      Ullrich von Bassewitz                                       */
10 /*               Wacholderweg 14                                             */
11 /*               D-70597 Stuttgart                                           */
12 /* EMail:        uz@cc65.org                                                 */
13 /*                                                                           */
14 /*                                                                           */
15 /* This software is provided 'as-is', without any expressed or implied       */
16 /* warranty.  In no event will the authors be held liable for any damages    */
17 /* arising from the use of this software.                                    */
18 /*                                                                           */
19 /* Permission is granted to anyone to use this software for any purpose,     */
20 /* including commercial applications, and to alter it and redistribute it    */
21 /* freely, subject to the following restrictions:                            */
22 /*                                                                           */
23 /* 1. The origin of this software must not be misrepresented; you must not   */
24 /*    claim that you wrote the original software. If you use this software   */
25 /*    in a product, an acknowledgment in the product documentation would be  */
26 /*    appreciated but is not required.                                       */
27 /* 2. Altered source versions must be plainly marked as such, and must not   */
28 /*    be misrepresented as being the original software.                      */
29 /* 3. This notice may not be removed or altered from any source              */
30 /*    distribution.                                                          */
31 /*                                                                           */
32 /*****************************************************************************/
33
34
35
36 #ifndef MEMORY_H
37 #define MEMORY_H
38
39
40
41 /*****************************************************************************/
42 /*                                   Data                                    */
43 /*****************************************************************************/
44
45
46
47 /*****************************************************************************/
48 /*                                   Code                                    */
49 /*****************************************************************************/
50
51
52
53 void MemWriteByte (unsigned Addr, unsigned char Val);
54 /* Write a byte to a memory location */
55
56 unsigned char MemReadByte (unsigned Addr);
57 /* Read a byte from a memory location */
58
59 unsigned MemReadWord (unsigned Addr);
60 /* Read a word from a memory location */
61
62 unsigned MemReadZPWord (unsigned char Addr);
63 /* Read a word from the zero page. This function differs from ReadMemW in that
64  * the read will always be in the zero page, even in case of an address
65  * overflow.
66  */
67
68 void MemLoad (const char* Filename, unsigned Addr, unsigned Size);
69 /* Load the contents of the given file into the RAM at the given address.
70  * If Size is not zero, we will read exactly Size bytes from the file and
71  * consider it an error if this is not possible. The memory attributes
72  * for the range is set to initialized.
73  */
74
75 void MemInit (void);
76 /* Initialize the memory subsystem */
77
78
79
80 /* End of memory.h */
81
82 #endif
83
84
85