99 lines
2.4 KiB
C++
99 lines
2.4 KiB
C++
/*
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epple2
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Copyright (C) 2008 by Christopher A. Mosher <cmosher01@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY, without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "languagecard.h"
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#include "screenimage.h"
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LanguageCard::LanguageCard(ScreenImage& gui, int slot):
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gui(gui),
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slot(slot),
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inhibit(false),
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ramTop(0x10000-0xE000),
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bank(1),
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readEnable(false),
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writeEnable(true),
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writeCount(0)
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{
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this->ramBank.push_back(new Memory(0xE000-0xD000));
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this->ramBank.push_back(new Memory(0xE000-0xD000));
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}
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LanguageCard::~LanguageCard()
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{
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for (Memory* m : this->ramBank) {
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delete m;
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}
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}
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unsigned char LanguageCard::io(const unsigned short address, const unsigned char data, const bool writing)
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{
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if ((address & 1) && !writing)
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{
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++this->writeCount;
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}
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else
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{
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this->writeCount = 0;
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}
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if (this->writeCount > 1)
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{
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this->writeEnable = true;
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}
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if (!(address & 1))
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{
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this->writeEnable = false;
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}
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const int r = address & 3;
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this->readEnable = (r==0 || r==3);
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this->bank = !(address & 8);
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this->gui.setLangCard(this->slot,this->readEnable,this->writeEnable,this->bank);
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return data;
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}
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void LanguageCard::ioBankRom(const unsigned short addr, unsigned char* const pb, const bool write)
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{
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this->inhibit = false;
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if (this->readEnable && !write)
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{
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if (addr < 0x1000)
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{
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*pb = this->ramBank[this->bank]->read(addr, *pb);
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}
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else
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{
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*pb = this->ramTop.read(addr-0x1000, *pb);
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}
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this->inhibit = true;
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}
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else if (this->writeEnable && write)
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{
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if (addr < 0x1000)
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{
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this->ramBank[this->bank]->write(addr,*pb);
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}
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else
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{
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this->ramTop.write(addr-0x1000,*pb);
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}
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}
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}
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