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Applied some updates to the DPC+ scheme, provided by Batari. 

git-svn-id: svn://svn.code.sf.net/p/stella/code/trunk@2202 8b62c5a3-ac7e-4cc8-8f21-d9a121418aba
This commit is contained in:
stephena 2011-01-08 16:02:00 +00:00
parent c50a7efdd1
commit fcb12065ce
2 changed files with 31 additions and 10 deletions
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36
src/emucore/CartDPCPlus.cxx
View File

@ -29,7 +29,7 @@ CartridgeDPCPlus::CartridgeDPCPlus(const uInt8* image, uInt32 size,
: Cartridge(settings),
myFastFetch(false),
myLDAimmediate(false),
myParameter(0),
myParameterPointer(0),
mySystemCycles(0),
myFractionalClocks(0.0)
{
@ -124,14 +124,17 @@ void CartridgeDPCPlus::install(System& system)
inline void CartridgeDPCPlus::clockRandomNumberGenerator()
{
// Update random number generator (32-bit LFSR)
myRandomNumber = ((myRandomNumber & 1) ? 0xa260012b: 0x00) ^ ((myRandomNumber >> 1) & 0x7FFFFFFF);
myRandomNumber = ((myRandomNumber & (1<<10)) ? 0x10adab1e: 0x00) ^
((myRandomNumber >> 11) | (myRandomNumber << 21));
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
inline void CartridgeDPCPlus::priorClockRandomNumberGenerator()
{
// Update random number generator (32-bit LFSR, reversed)
myRandomNumber = ((myRandomNumber & (1<<31)) ? 0x44c00257: 0x00) ^ (myRandomNumber << 1);
myRandomNumber = ((myRandomNumber & (1<<31)) ?
((0x10adab1e^myRandomNumber) << 11) | ((0x10adab1e^myRandomNumber) >> 21) :
(myRandomNumber << 11) | (myRandomNumber >> 21));
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@ -162,11 +165,22 @@ inline void CartridgeDPCPlus::updateMusicModeDataFetchers()
inline void CartridgeDPCPlus::callFunction(uInt8 value)
{
// myParameter
Int16 ROMdata = myParameter[1] * 256 + myParameter[0];
switch (value)
{
//case 0: template for future special functions
// CallSpecialFunctionO(myParameter);
// break;
case 0: // Parameter Pointer reset
myParameterPointer=0;
break;
case 1: // Copy ROM to fetcher
for(int i = 0; i < myParameter[3]; ++i)
myDisplayImage[myCounters[myParameter[2]]+i] = myProgramImage[ROMdata+i];
myParameterPointer = 0;
break;
case 2: // Copy value to fetcher
for(int i = 0; i < myParameter[3]; ++i)
myDisplayImage[myCounters[myParameter[2]]+i] = myParameter[0];
myParameterPointer = 0;
break;
case 255: // Call user writen ARM code (most likely be C compiled for ARM).
// ARM code not supported by Stella at this time.
break;
@ -409,7 +423,7 @@ bool CartridgeDPCPlus::poke(uInt16 address, uInt8 value)
break;
case 0x01: // PARAMETER - set parameter used by CALLFUNCTION (not all functions use the parameter)
myParameter = value;
myParameter[myParameterPointer++] = value;
break;
case 0x02: // CALLFUNCTION
@ -642,7 +656,9 @@ bool CartridgeDPCPlus::save(Serializer& out) const
out.putBool(myLDAimmediate);
// Control Byte to update
out.putByte((char) myParameter);
out.putInt(8);
for(i = 0; i < 8; ++i)
out.putByte((char)myParameter[i]);
// The music counters
out.putInt(3);
@ -717,7 +733,9 @@ bool CartridgeDPCPlus::load(Serializer& in)
myLDAimmediate = in.getBool();
// Control Byte to update
myParameter = (uInt8) in.getByte();
limit = (uInt32) in.getInt();
for(i = 0; i < limit; ++i)
myParameter[i] = (uInt8) in.getByte();
// The music mode counters for the data fetchers
limit = (uInt32) in.getInt();

5
src/emucore/CartDPCPlus.hxx
View File

@ -206,7 +206,10 @@ class CartridgeDPCPlus : public Cartridge
bool myLDAimmediate;
// Parameter for special functions
uInt8 myParameter;
uInt8 myParameter[8];
// Parameter pointer for special functions
uInt8 myParameterPointer;
// The music mode counters
uInt32 myMusicCounters[3];