mirror of https://github.com/pyrollo/vinace.git
64 lines
1.9 KiB
C++
64 lines
1.9 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-slot-rom-bus.hpp"
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CSlotRomBus::CSlotRomBus() {
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this->dummy = new CDummyMemory();
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// Actually, there is no slot #0 but it is used when no rom is selected
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for (int index = 0; index < 8; index ++) {
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rom[index] = dummy;
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romExt[index] = dummy;
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}
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selectedRom = 0;
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}
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void CSlotRomBus::insert_card(int slot, CMemory *cardRom, CMemory *cardRomExt) {
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if (slot > 0 and slot < 8) {
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rom[slot] = (cardRom)?cardRom:dummy;
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romExt[slot] = (cardRomExt)?cardRomExt:dummy;
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}
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}
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void CSlotRomBus::remove_card(int slot) {
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if (slot > 0 and slot < 8)
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rom[slot] = dummy;
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romExt[slot] = dummy;
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}
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// ROM management is explained (not so well) in IIe Reference Manual page 132
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// Overview : when the card ROM is accessed, then its expansion ROM is visible
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// in $C800-$CFFF.
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BYTE CSlotRomBus::read(WORD addr) {
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// 256 bytes ROMs
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if (addr < 0x800) {
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selectedRom = (addr>>8);
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return rom[addr>>8]->read(addr&0xff);
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} else {
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if (addr == 0x0fff) // CLRROM - Rom extension selection cancel
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// TODO : check CLRROM behavior : which byte is returned by CLRROM?
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selectedRom = 0;
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return romExt[selectedRom]->read(addr-0x800);
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}
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}
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