mirror of https://github.com/pyrollo/vinace.git
57 lines
1.6 KiB
C++
57 lines
1.6 KiB
C++
/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
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/*
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* Vinace
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* Copyright (C) P.Y. Rollo 2009 <dev@pyrollo.com>
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*
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* Vinace is free software: you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Vinace is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "c-main-memory-bus.hpp"
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CMainMemoryBus::CMainMemoryBus(CMemory *ram, CMemory *iou, CMemory *ioBus, CMemory *lcBus) {
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this->ram = ram;
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this->iou = iou;
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this->ioBus = ioBus;
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this->lcBus = lcBus;
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}
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BYTE CMainMemoryBus::read(WORD addr) {
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// Language Card ($D000-$FFFF)
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if (addr >= 0xD000) return lcBus->read(addr-0xD000);
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// Main ram ($0000-$BFFF)
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if (addr < 0xC000) return ram->read(addr);
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// Slot rom
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if (addr >= 0xC100) return ioBus->read(addr-0xC000);
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// Input Output Unit
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return iou->read(addr-0xC000);
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}
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void CMainMemoryBus::write(WORD addr, BYTE byte) {
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// Main ram ($0000-$BFFF)
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if (addr < 0xC000) { ram->write(addr, byte); return; }
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// Language Card ($D000-$FFFF)
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if (addr >= 0xD000) { lcBus->write(addr-0xD000, byte); return; }
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// Input Output Unit
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if (addr < 0xC100) { iou->write(addr-0xC000, byte); return; }
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// Slot rom -> No write
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};
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