mirror of https://github.com/stella-emu/stella.git
Initial check-in of Chetiry bankswitch scheme from cd-w. For now, it's
basically the skeleton of F4SC, since it's partly modeled after that (8 4K banks, etc). More work will come after the 3.7 release. git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@2452 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
This commit is contained in:
stephena
parent
42225de183
commit
68f739914f
|
|
@ -0,0 +1,254 @@
|
|||
//============================================================================
|
||||
//
|
||||
// SSSS tt lll lll
|
||||
// SS SS tt ll ll
|
||||
// SS tttttt eeee ll ll aaaa
|
||||
// SSSS tt ee ee ll ll aa
|
||||
// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
|
||||
// SS SS tt ee ll ll aa aa
|
||||
// SSSS ttt eeeee llll llll aaaaa
|
||||
//
|
||||
// Copyright (c) 1995-2012 by Bradford W. Mott, Stephen Anthony
|
||||
// and the Stella Team
|
||||
//
|
||||
// See the file "License.txt" for information on usage and redistribution of
|
||||
// this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||||
//
|
||||
// $Id$
|
||||
//============================================================================
|
||||
|
||||
#include <cassert>
|
||||
#include <cstring>
|
||||
|
||||
#include "System.hxx"
|
||||
#include "CartCTY.hxx"
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
CartridgeCTY::CartridgeCTY(const uInt8* image, uInt32 size, const Settings& settings)
|
||||
: Cartridge(settings)
|
||||
{
|
||||
// Copy the ROM image into my buffer
|
||||
memcpy(myImage, image, BSPF_min(32768u, size));
|
||||
createCodeAccessBase(32768);
|
||||
|
||||
// This cart contains 64 bytes extended RAM @ 0x1000
|
||||
registerRamArea(0x1000, 64, 0x40, 0x00);
|
||||
|
||||
// Remember startup bank
|
||||
myStartBank = 1;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
CartridgeCTY::~CartridgeCTY()
|
||||
{
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
void CartridgeCTY::reset()
|
||||
{
|
||||
// Initialize RAM
|
||||
if(mySettings.getBool("ramrandom"))
|
||||
for(uInt32 i = 0; i < 256; ++i)
|
||||
myScoreRAM[i] = mySystem->randGenerator().next();
|
||||
else
|
||||
memset(myScoreRAM, 0, 256);
|
||||
|
||||
// Upon reset we switch to the startup bank
|
||||
bank(myStartBank);
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
void CartridgeCTY::install(System& system)
|
||||
{
|
||||
mySystem = &system;
|
||||
uInt16 shift = mySystem->pageShift();
|
||||
uInt16 mask = mySystem->pageMask();
|
||||
|
||||
// Make sure the system we're being installed in has a page size that'll work
|
||||
assert(((0x1080 & mask) == 0) && ((0x1100 & mask) == 0));
|
||||
|
||||
System::PageAccess access(0, 0, 0, this, System::PA_READ);
|
||||
|
||||
// Set the page accessing method for the RAM writing pages
|
||||
access.type = System::PA_WRITE;
|
||||
for(uInt32 j = 0x1000; j < 0x1080; j += (1 << shift))
|
||||
{
|
||||
access.directPokeBase = &myScoreRAM[j & 0x007F];
|
||||
access.codeAccessBase = &myCodeAccessBase[j & 0x007F];
|
||||
mySystem->setPageAccess(j >> shift, access);
|
||||
}
|
||||
|
||||
// Set the page accessing method for the RAM reading pages
|
||||
access.directPokeBase = 0;
|
||||
access.type = System::PA_READ;
|
||||
for(uInt32 k = 0x1080; k < 0x1100; k += (1 << shift))
|
||||
{
|
||||
access.directPeekBase = &myScoreRAM[k & 0x007F];
|
||||
access.codeAccessBase = &myCodeAccessBase[0x80 + (k & 0x007F)];
|
||||
mySystem->setPageAccess(k >> shift, access);
|
||||
}
|
||||
|
||||
// Install pages for the startup bank
|
||||
bank(myStartBank);
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
uInt8 CartridgeCTY::peek(uInt16 address)
|
||||
{
|
||||
uInt16 peekAddress = address;
|
||||
address &= 0x0FFF;
|
||||
|
||||
// Switch banks if necessary
|
||||
if((address >= 0x0FF4) && (address <= 0x0FFB))
|
||||
bank(address - 0x0FF4);
|
||||
|
||||
if(address < 0x0080) // Write port is at 0xF000 - 0xF080 (128 bytes)
|
||||
{
|
||||
// Reading from the write port triggers an unwanted write
|
||||
uInt8 value = mySystem->getDataBusState(0xFF);
|
||||
|
||||
if(bankLocked())
|
||||
return value;
|
||||
else
|
||||
{
|
||||
triggerReadFromWritePort(peekAddress);
|
||||
return myScoreRAM[address] = value;
|
||||
}
|
||||
}
|
||||
|
||||
// NOTE: This does not handle accessing RAM, however, this function
|
||||
// should never be called for RAM because of the way page accessing
|
||||
// has been setup
|
||||
return myImage[(myCurrentBank << 12) + address];
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
bool CartridgeCTY::poke(uInt16 address, uInt8)
|
||||
{
|
||||
address &= 0x0FFF;
|
||||
|
||||
// Switch banks if necessary
|
||||
if((address >= 0x0FF4) && (address <= 0x0FFB))
|
||||
bank(address - 0x0FF4);
|
||||
|
||||
// NOTE: This does not handle accessing RAM, however, this function
|
||||
// should never be called for RAM because of the way page accessing
|
||||
// has been setup
|
||||
return false;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
bool CartridgeCTY::bank(uInt16 bank)
|
||||
{
|
||||
if(bankLocked()) return false;
|
||||
|
||||
// Remember what bank we're in
|
||||
myCurrentBank = bank;
|
||||
uInt16 offset = myCurrentBank << 12;
|
||||
uInt16 shift = mySystem->pageShift();
|
||||
uInt16 mask = mySystem->pageMask();
|
||||
|
||||
System::PageAccess access(0, 0, 0, this, System::PA_READ);
|
||||
|
||||
// Set the page accessing methods for the hot spots
|
||||
for(uInt32 i = (0x1FF4 & ~mask); i < 0x2000; i += (1 << shift))
|
||||
{
|
||||
access.codeAccessBase = &myCodeAccessBase[offset + (i & 0x0FFF)];
|
||||
mySystem->setPageAccess(i >> shift, access);
|
||||
}
|
||||
|
||||
// Setup the page access methods for the current bank
|
||||
for(uInt32 address = 0x1100; address < (0x1FF4U & ~mask);
|
||||
address += (1 << shift))
|
||||
{
|
||||
access.directPeekBase = &myImage[offset + (address & 0x0FFF)];
|
||||
access.codeAccessBase = &myCodeAccessBase[offset + (address & 0x0FFF)];
|
||||
mySystem->setPageAccess(address >> shift, access);
|
||||
}
|
||||
return myBankChanged = true;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
uInt16 CartridgeCTY::bank() const
|
||||
{
|
||||
return myCurrentBank;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
uInt16 CartridgeCTY::bankCount() const
|
||||
{
|
||||
return 8;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
bool CartridgeCTY::patch(uInt16 address, uInt8 value)
|
||||
{
|
||||
address &= 0x0FFF;
|
||||
|
||||
if(address < 0x0100)
|
||||
{
|
||||
// Normally, a write to the read port won't do anything
|
||||
// However, the patch command is special in that ignores such
|
||||
// cart restrictions
|
||||
myScoreRAM[address & 0x007F] = value;
|
||||
}
|
||||
else
|
||||
myImage[(myCurrentBank << 12) + address] = value;
|
||||
|
||||
return myBankChanged = true;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
const uInt8* CartridgeCTY::getImage(int& size) const
|
||||
{
|
||||
size = 32768;
|
||||
return myImage;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
bool CartridgeCTY::save(Serializer& out) const
|
||||
{
|
||||
try
|
||||
{
|
||||
out.putString(name());
|
||||
out.putInt(myCurrentBank);
|
||||
|
||||
// The 256 bytes of RAM
|
||||
out.putInt(256);
|
||||
for(uInt32 i = 0; i < 256; ++i)
|
||||
out.putByte((char)myScoreRAM[i]);
|
||||
}
|
||||
catch(const char* msg)
|
||||
{
|
||||
cerr << "ERROR: CartridgeCTY::save" << endl << " " << msg << endl;
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
|
||||
bool CartridgeCTY::load(Serializer& in)
|
||||
{
|
||||
try
|
||||
{
|
||||
if(in.getString() != name())
|
||||
return false;
|
||||
|
||||
myCurrentBank = (uInt16) in.getInt();
|
||||
|
||||
uInt32 limit = (uInt32) in.getInt();
|
||||
for(uInt32 i = 0; i < limit; ++i)
|
||||
myScoreRAM[i] = (uInt8) in.getByte();
|
||||
}
|
||||
catch(const char* msg)
|
||||
{
|
||||
cerr << "ERROR: CartridgeCTY::load" << endl << " " << msg << endl;
|
||||
return false;
|
||||
}
|
||||
|
||||
// Remember what bank we were in
|
||||
bank(myCurrentBank);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
|
@ -0,0 +1,151 @@
|
|||
//============================================================================
|
||||
//
|
||||
// SSSS tt lll lll
|
||||
// SS SS tt ll ll
|
||||
// SS tttttt eeee ll ll aaaa
|
||||
// SSSS tt ee ee ll ll aa
|
||||
// SS tt eeeeee ll ll aaaaa -- "An Atari 2600 VCS Emulator"
|
||||
// SS SS tt ee ll ll aa aa
|
||||
// SSSS ttt eeeee llll llll aaaaa
|
||||
//
|
||||
// Copyright (c) 1995-2012 by Bradford W. Mott, Stephen Anthony
|
||||
// and the Stella Team
|
||||
//
|
||||
// See the file "License.txt" for information on usage and redistribution of
|
||||
// this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
||||
//
|
||||
// $Id$
|
||||
//============================================================================
|
||||
|
||||
#ifndef CARTRIDGECHETIRY_HXX
|
||||
#define CARTRIDGECHETIRY_HXX
|
||||
|
||||
class System;
|
||||
|
||||
#include "bspf.hxx"
|
||||
#include "Cart.hxx"
|
||||
|
||||
/**
|
||||
TODO - add description from cd-w.
|
||||
|
||||
@author Stephen Anthony and Chris D. Walton
|
||||
@version $Id$
|
||||
*/
|
||||
class CartridgeCTY : public Cartridge
|
||||
{
|
||||
public:
|
||||
/**
|
||||
Create a new cartridge using the specified image
|
||||
|
||||
@param image Pointer to the ROM image
|
||||
@param size The size of the ROM image
|
||||
@param settings A reference to the various settings (read-only)
|
||||
*/
|
||||
CartridgeCTY(const uInt8* image, uInt32 size, const Settings& settings);
|
||||
|
||||
/**
|
||||
Destructor
|
||||
*/
|
||||
virtual ~CartridgeCTY();
|
||||
|
||||
public:
|
||||
/**
|
||||
Reset device to its power-on state
|
||||
*/
|
||||
void reset();
|
||||
|
||||
/**
|
||||
Install cartridge in the specified system. Invoked by the system
|
||||
when the cartridge is attached to it.
|
||||
|
||||
@param system The system the device should install itself in
|
||||
*/
|
||||
void install(System& system);
|
||||
|
||||
/**
|
||||
Install pages for the specified bank in the system.
|
||||
|
||||
@param bank The bank that should be installed in the system
|
||||
*/
|
||||
bool bank(uInt16 bank);
|
||||
|
||||
/**
|
||||
Get the current bank.
|
||||
*/
|
||||
uInt16 bank() const;
|
||||
|
||||
/**
|
||||
Query the number of banks supported by the cartridge.
|
||||
*/
|
||||
uInt16 bankCount() const;
|
||||
|
||||
/**
|
||||
Patch the cartridge ROM.
|
||||
|
||||
@param address The ROM address to patch
|
||||
@param value The value to place into the address
|
||||
@return Success or failure of the patch operation
|
||||
*/
|
||||
bool patch(uInt16 address, uInt8 value);
|
||||
|
||||
/**
|
||||
Access the internal ROM image for this cartridge.
|
||||
|
||||
@param size Set to the size of the internal ROM image data
|
||||
@return A pointer to the internal ROM image data
|
||||
*/
|
||||
const uInt8* getImage(int& size) const;
|
||||
|
||||
/**
|
||||
Save the current state of this cart to the given Serializer.
|
||||
|
||||
@param out The Serializer object to use
|
||||
@return False on any errors, else true
|
||||
*/
|
||||
bool save(Serializer& out) const;
|
||||
|
||||
/**
|
||||
Load the current state of this cart from the given Serializer.
|
||||
|
||||
@param in The Serializer object to use
|
||||
@return False on any errors, else true
|
||||
*/
|
||||
bool load(Serializer& in);
|
||||
|
||||
/**
|
||||
Get a descriptor for the device name (used in error checking).
|
||||
|
||||
@return The name of the object
|
||||
*/
|
||||
string name() const { return "CartridgeCTY"; }
|
||||
|
||||
public:
|
||||
/**
|
||||
Get the byte at the specified address.
|
||||
|
||||
@return The byte at the specified address
|
||||
*/
|
||||
uInt8 peek(uInt16 address);
|
||||
|
||||
/**
|
||||
Change the byte at the specified address to the given value
|
||||
|
||||
@param address The address where the value should be stored
|
||||
@param value The value to be stored at the address
|
||||
@return True if the poke changed the device address space, else false
|
||||
*/
|
||||
bool poke(uInt16 address, uInt8 value);
|
||||
|
||||
private:
|
||||
// Indicates which bank is currently active
|
||||
uInt16 myCurrentBank;
|
||||
|
||||
// The 16K ROM image of the cartridge
|
||||
uInt8 myImage[32768];
|
||||
|
||||
// The 256 bytes of score-table RAM
|
||||
uInt8 myScoreRAM[256];
|
||||
uInt8* myScorePtr;
|
||||
};
|
||||
|
||||
#endif
|
||||
|
|
@ -3,15 +3,17 @@ MODULE := src/emucore
|
|||
MODULE_OBJS := \
|
||||
src/emucore/AtariVox.o \
|
||||
src/emucore/Booster.o \
|
||||
src/emucore/Cart.o \
|
||||
src/emucore/Cart0840.o \
|
||||
src/emucore/Cart2K.o \
|
||||
src/emucore/Cart3F.o \
|
||||
src/emucore/Cart3E.o \
|
||||
src/emucore/Cart3F.o \
|
||||
src/emucore/Cart4A50.o \
|
||||
src/emucore/Cart4K.o \
|
||||
src/emucore/CartAR.o \
|
||||
src/emucore/CartCV.o \
|
||||
src/emucore/CartCM.o \
|
||||
src/emucore/Cart.o \
|
||||
src/emucore/CartCTY.o \
|
||||
src/emucore/CartCV.o \
|
||||
src/emucore/CartDPC.o \
|
||||
src/emucore/CartDPCPlus.o \
|
||||
src/emucore/CartE0.o \
|
||||
|
|
@ -31,7 +33,6 @@ MODULE_OBJS := \
|
|||
src/emucore/CartMC.o \
|
||||
src/emucore/CartSB.o \
|
||||
src/emucore/CartUA.o \
|
||||
src/emucore/Cart0840.o \
|
||||
src/emucore/CartX07.o \
|
||||
src/emucore/CompuMate.o \
|
||||
src/emucore/Console.o \
|
||||
|
|
|
|||
Loading…
Reference in New Issue