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/*
* plus4memrom.c -- Plus4 ROM access.
*
* Written by
* Andreas Boose <viceteam@t-online.de>
*
* This file is part of VICE, the Versatile Commodore Emulator.
* See README for copyright notice.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
* 02111-1307 USA.
*
*/
#include "vice.h"
#include "plus4mem.h"
#include "plus4memrom.h"
#include "types.h"
BYTE plus4memrom_basic_rom[PLUS4_BASIC_ROM_SIZE];
BYTE plus4memrom_kernal_rom[PLUS4_KERNAL_ROM_SIZE];
BYTE plus4memrom_kernal_trap_rom[PLUS4_KERNAL_ROM_SIZE];
BYTE REGPARM1 plus4memrom_kernal_read(WORD addr)
{
return plus4memrom_kernal_rom[addr & 0x3fff];
}
void REGPARM2 plus4memrom_kernal_store(WORD addr, BYTE value)
{
plus4memrom_kernal_rom[addr & 0x3fff] = value;
}
BYTE REGPARM1 plus4memrom_basic_read(WORD addr)
{
return plus4memrom_basic_rom[addr & 0x3fff];
}
void REGPARM2 plus4memrom_basic_store(WORD addr, BYTE value)
{
plus4memrom_basic_rom[addr & 0x3fff] = value;
}
BYTE REGPARM1 plus4memrom_trap_read(WORD addr)
{
switch (addr & 0xc000) {
case 0xc000:
return plus4memrom_kernal_trap_rom[addr & 0x3fff];
}
return 0;
}
void REGPARM2 plus4memrom_trap_store(WORD addr, BYTE value)
{
switch (addr & 0xc000) {
case 0xc000:
plus4memrom_kernal_trap_rom[addr & 0x3fff] = value;
break;
}
}
BYTE REGPARM1 plus4memrom_extromlo1_read(WORD addr)
{
return extromlo1[addr & 0x3fff];
}
BYTE REGPARM1 plus4memrom_extromlo2_read(WORD addr)
{
return extromlo2[addr & 0x3fff];
}
BYTE REGPARM1 plus4memrom_extromlo3_read(WORD addr)
{
return extromlo3[addr & 0x3fff];
}
BYTE REGPARM1 plus4memrom_extromhi1_read(WORD addr)
{
return extromhi1[addr & 0x3fff];
}
BYTE REGPARM1 plus4memrom_extromhi2_read(WORD addr)
{
return extromhi2[addr & 0x3fff];
}
BYTE REGPARM1 plus4memrom_extromhi3_read(WORD addr)
{
return extromhi3[addr & 0x3fff];
}
BYTE REGPARM1 plus4memrom_rom_read(WORD addr)
{
switch (addr & 0xc000) {
case 0x8000:
switch ((mem_config >> 1) & 3) {
case 0:
return plus4memrom_basic_read(addr);
case 1:
return plus4memrom_extromlo1_read(addr);
case 2:
return plus4memrom_extromlo2_read(addr);
case 3:
return plus4memrom_extromlo3_read(addr);
}
case 0xc000:
if ((addr & 0xff00) == 0xfc00) {
return plus4memrom_kernal_read(addr);
} else {
switch ((mem_config >> 3) & 3) {
case 0:
return plus4memrom_kernal_read(addr);
case 1:
return plus4memrom_extromhi1_read(addr);
case 2:
return plus4memrom_extromhi2_read(addr);
case 3:
return plus4memrom_extromhi3_read(addr);
}
}
}
return 0;
}
void REGPARM2 plus4memrom_rom_store(WORD addr, BYTE value)
{
switch (addr & 0xc000) {
case 0x8000:
plus4memrom_basic_rom[addr & 0x3fff] = value;
break;
case 0xc000:
plus4memrom_kernal_rom[addr & 0x3fff] = value;
break;
}
}
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