ti83-sdk/tool/tilem-src/emu/x6/x6_memory.c

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2023-10-08 16:33:37 +00:00
/*
* libtilemcore - Graphing calculator emulation library
*
* Copyright (C) 2001 Solignac Julien
* Copyright (C) 2004-2011 Benjamin Moody
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <tilem.h>
#include "x6.h"
void x6_z80_wrmem(TilemCalc* calc, dword A, byte v)
{
dword pa = 0x4000 * calc->mempagemap[(A)>>14] + (A & 0x3FFF);
if (pa >= 0x40000) {
*(calc->mem + pa) = v;
if (((pa - 0x40000 - calc->lcd.addr) >> 6)
< (unsigned) calc->lcd.rowstride)
calc->z80.lastlcdwrite = calc->z80.clock;
}
}
byte x6_z80_rdmem(TilemCalc* calc, dword A)
{
dword pa = 0x4000 * calc->mempagemap[(A)>>14] + (A & 0x3FFF);
return (*(calc->mem + pa));
}
dword x6_mem_ltop(TilemCalc* calc, dword A)
{
byte page = calc->mempagemap[A >> 14];
return ((page << 14) | (A & 0x3fff));
}
dword x6_mem_ptol(TilemCalc* calc, dword A)
{
byte page = A >> 14;
int i;
for (i = 0; i < 4; i++) {
if (calc->mempagemap[i] == page) {
return ((i << 14) | (A & 0x3fff));
}
}
return (0xffffffff);
}