mirror of https://github.com/stella-emu/stella.git
Added support for UA Limited style bankswitching. Funky Fish and
Pleiades should now work. git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@280 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
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bwmott
parent
e20857ee48
commit
ab78d1da4f
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@ -8,12 +8,12 @@
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2003 by Bradford W. Mott
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// Copyright (c) 1995-2004 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: Cart.cxx,v 1.6 2003-02-17 04:59:54 bwmott Exp $
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// $Id: Cart.cxx,v 1.7 2004-06-25 03:44:12 bwmott Exp $
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//============================================================================
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#include <assert.h>
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@ -37,6 +37,7 @@
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#include "CartMC.hxx"
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#include "CartMB.hxx"
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#include "CartCV.hxx"
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#include "CartUA.hxx"
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#include "MD5.hxx"
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#include "Props.hxx"
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@ -92,6 +93,8 @@ Cartridge* Cartridge::create(const uInt8* image, uInt32 size,
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cartridge = new CartridgeMB(image);
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else if(type == "CV")
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cartridge = new CartridgeCV(image, size);
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else if(type == "UA")
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cartridge = new CartridgeUA(image);
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else
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{
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// TODO: At some point this should be handled in a better way...
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@ -142,6 +145,8 @@ string Cartridge::autodetectType(const uInt8* image, uInt32 size)
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{"ac7c2260378975614192ca2bc3d20e0b", "FE"}, // Decathlon
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{"4f618c2429138e0280969193ed6c107e", "FE"}, // Robot Tank
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{"6d842c96d5a01967be9680080dd5be54", "DPC"}, // Pitfall II
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{"d3bb42228a6cd452c111c1932503cc03", "UA"}, // Funky Fish
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{"8bbfd951c89cc09c148bfabdefa08bec", "UA"}, // Pleiades
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{(char*)0, (char*)0}
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};
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@ -0,0 +1,215 @@
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//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2004 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: CartUA.cxx,v 1.1 2004-06-25 03:44:12 bwmott Exp $
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//============================================================================
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#include <cassert>
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#include <iostream>
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#include "CartUA.hxx"
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#include "System.hxx"
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#include "Serializer.hxx"
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#include "Deserializer.hxx"
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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CartridgeUA::CartridgeUA(const uInt8* image)
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{
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// Copy the ROM image into my buffer
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for(uInt32 addr = 0; addr < 8192; ++addr)
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{
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myImage[addr] = image[addr];
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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CartridgeUA::~CartridgeUA()
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{
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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const char* CartridgeUA::name() const
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{
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return "CartridgeUA";
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeUA::reset()
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{
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// Upon reset we switch to bank 0
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bank(0);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeUA::install(System& system)
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{
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mySystem = &system;
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uInt16 shift = mySystem->pageShift();
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uInt16 mask = mySystem->pageMask();
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// Make sure the system we're being installed in has a page size that'll work
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assert((0x1000 & mask) == 0);
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// Get the page accessing methods for the hot spots since they overlap
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// areas within the TIA we'll need to forward requests to the TIA
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myHotSpotPageAccess = mySystem->getPageAccess(0x0220 >> shift);
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// Set the page accessing methods for the hot spots
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System::PageAccess access;
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access.directPeekBase = 0;
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access.directPokeBase = 0;
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access.device = this;
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mySystem->setPageAccess(0x0220 >> shift, access);
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mySystem->setPageAccess(0x0240 >> shift, access);
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// Install pages for bank 0
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bank(0);
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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uInt8 CartridgeUA::peek(uInt16 address)
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{
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address = address & 0x1FFF;
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// Switch banks if necessary
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switch(address)
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{
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case 0x0220:
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// Set the current bank to the lower 4k bank
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bank(0);
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break;
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case 0x0240:
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// Set the current bank to the upper 4k bank
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bank(1);
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break;
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default:
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break;
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}
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if(!(address & 0x1000))
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{
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return myHotSpotPageAccess.device->peek(address);
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}
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else
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{
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return 0;
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeUA::poke(uInt16 address, uInt8 value)
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{
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address = address & 0x1FFF;
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// Switch banks if necessary
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switch(address)
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{
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case 0x0220:
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// Set the current bank to the lower 4k bank
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bank(0);
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break;
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case 0x0240:
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// Set the current bank to the upper 4k bank
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bank(1);
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break;
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default:
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break;
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}
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if(!(address & 0x1000))
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{
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myHotSpotPageAccess.device->poke(address, value);
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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void CartridgeUA::bank(uInt16 bank)
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{
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// Remember what bank we're in
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myCurrentBank = bank;
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uInt16 offset = myCurrentBank * 4096;
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uInt16 shift = mySystem->pageShift();
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uInt16 mask = mySystem->pageMask();
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// Setup the page access methods for the current bank
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System::PageAccess access;
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access.device = this;
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access.directPokeBase = 0;
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// Map ROM image into the system
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for(uInt32 address = 0x1000; address < 0x2000; address += (1 << shift))
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{
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access.directPeekBase = &myImage[offset + (address & 0x0FFF)];
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mySystem->setPageAccess(address >> shift, access);
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}
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeUA::save(Serializer& out)
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{
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string cart = name();
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try
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{
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out.putString(cart);
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out.putLong(myCurrentBank);
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}
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catch(char *msg)
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{
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cerr << msg << endl;
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return false;
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}
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catch(...)
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{
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cerr << "Unknown error in save state for " << cart << endl;
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return false;
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}
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return true;
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}
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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bool CartridgeUA::load(Deserializer& in)
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{
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string cart = name();
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try
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{
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if(in.getString() != cart)
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return false;
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myCurrentBank = (uInt16)in.getLong();
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}
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catch(char *msg)
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{
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cerr << msg << endl;
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return false;
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}
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catch(...)
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{
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cerr << "Unknown error in load state for " << cart << endl;
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return false;
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}
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// Remember what bank we were in
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bank(myCurrentBank);
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return true;
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}
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@ -0,0 +1,124 @@
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//============================================================================
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//
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// SSSS tt lll lll
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// SS SS tt ll ll
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// SS tttttt eeee ll ll aaaa
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// SSSS tt ee ee ll ll aa
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// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
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// SS SS tt ee ll ll aa aa
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// SSSS ttt eeeee llll llll aaaaa
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//
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// Copyright (c) 1995-2004 by Bradford W. Mott
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//
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// See the file "license" for information on usage and redistribution of
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// this file, and for a DISCLAIMER OF ALL WARRANTIES.
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//
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// $Id: CartUA.hxx,v 1.1 2004-06-25 03:44:12 bwmott Exp $
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//============================================================================
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#ifndef CARTRIDGEUA_HXX
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#define CARTRIDGEUA_HXX
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class CartridgeUA;
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class Serializer;
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class Deserializer;
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#include "bspf.hxx"
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#include "Cart.hxx"
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#include "System.hxx"
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/**
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Cartridge class used for UA Limited's 8K bankswitched games. There
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are two 4K banks.
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@author Bradford W. Mott
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@version $Id: CartUA.hxx,v 1.1 2004-06-25 03:44:12 bwmott Exp $
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*/
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class CartridgeUA : public Cartridge
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{
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public:
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/**
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Create a new cartridge using the specified image
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@param image Pointer to the ROM image
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*/
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CartridgeUA(const uInt8* image);
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/**
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Destructor
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*/
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virtual ~CartridgeUA();
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public:
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/**
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Get a null terminated string which is the device's name (i.e. "M6532")
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@return The name of the device
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*/
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virtual const char* name() const;
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/**
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Reset device to its power-on state
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*/
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virtual void reset();
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/**
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Install cartridge in the specified system. Invoked by the system
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when the cartridge is attached to it.
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@param system The system the device should install itself in
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*/
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virtual void install(System& system);
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/**
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Saves the current state of this device to the given Serializer.
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@param out The serializer device to save to.
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@return The result of the save. True on success, false on failure.
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*/
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virtual bool save(Serializer& out);
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/**
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Loads the current state of this device from the given Deserializer.
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@param in The deserializer device to load from.
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@return The result of the load. True on success, false on failure.
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*/
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virtual bool load(Deserializer& in);
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public:
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/**
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Get the byte at the specified address.
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@return The byte at the specified address
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*/
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virtual uInt8 peek(uInt16 address);
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/**
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Change the byte at the specified address to the given value
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@param address The address where the value should be stored
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@param value The value to be stored at the address
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*/
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virtual void poke(uInt16 address, uInt8 value);
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private:
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/**
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Install pages for the specified bank in the system
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@param bank The bank that should be installed in the system
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*/
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void bank(uInt16 bank);
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private:
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// Indicates which bank is currently active
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uInt16 myCurrentBank;
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// The 8K ROM image of the cartridge
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uInt8 myImage[8192];
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// Previous Device's page access
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System::PageAccess myHotSpotPageAccess;
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};
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#endif
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