bslathi19/cc65
1
0
Fork 0
Code Issues Pull Requests Actions 1 Packages Projects Releases Wiki Activity

First import

Browse Source 
git-svn-id: svn://svn.cc65.org/cc65/trunk@1209 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2002-03-30 16:43:27 +00:00
parent 7d11fa012c
commit febf56a10b
11 changed files with 3724 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

93
src/sim65/memory.c Normal file
View File

@@ -0,0 +1,93 @@
/*****************************************************************************/
/* */
/* memory.h */
/* */
/* Memory subsystem for the 6502 simulator */
/* */
/* */
/* */
/* (C) 2002 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/* sim65 */
#include "memory.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
static unsigned char RAM[0x10000];
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void WriteMem (unsigned Addr, unsigned char Val)
/* Write a byte to a memory location */
{
RAM[Addr] = Val;
}
unsigned char ReadMem (unsigned Addr)
/* Read a byte from a memory location */
{
return RAM[Addr];
}
unsigned ReadMemW (unsigned Addr)
/* Read a word from a memory location */
{
unsigned W = ReadMem (Addr++);
return (W | (ReadMem (Addr) << 8));
}
unsigned ReadZeroPageW (unsigned char Addr)
/* Read a word from the zero page. This function differs from ReadMemW in that
* the read will always be in the zero page, even in case of an address
* overflow.
*/
{
unsigned W = ReadMem (Addr++);
return (W | (ReadMem (Addr) << 8));
}