1 /*****************************************************************************/
5 /* Memory subsystem for the 6502 simulator */
9 /* (C) 2002-2003 Ullrich von Bassewitz */
10 /* Römerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
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. */
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: */
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 */
32 /*****************************************************************************/
41 /*****************************************************************************/
43 /*****************************************************************************/
50 /* Memory size of the CPU */
51 extern unsigned MemSize;
55 /*****************************************************************************/
57 /*****************************************************************************/
61 void MemWriteByte (unsigned Addr, unsigned char Val);
62 /* Write a byte to a memory location */
64 unsigned char MemReadByte (unsigned Addr);
65 /* Read a byte from a memory location */
67 unsigned MemReadWord (unsigned Addr);
68 /* Read a word from a memory location */
70 unsigned MemReadZPWord (unsigned char Addr);
71 /* Read a word from the zero page. This function differs from ReadMemW in that
72 * the read will always be in the zero page, even in case of an address
76 void MemAssignChip (const struct ChipInstance* CI, unsigned Addr, unsigned Range);
77 /* Assign a chip instance to memory locations */
79 const struct ChipInstance* MemGetChip (unsigned Addr);
80 /* Get the chip that is located at the given address (may return NULL). */
83 /* Initialize the memory subsystem */