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Attempted ball graphics enable delay.

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This commit is contained in:
Thomas Harte 2015-07-30 23:01:28 -04:00
parent 6ad3fbbaf2
commit 39bfbf1000
2 changed files with 10 additions and 6 deletions
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14
Machines/Atari2600.cpp
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@ -254,18 +254,22 @@ int Machine::perform_bus_operation(CPU6502::BusOperation operation, uint16_t add
case 0x13: _missilePosition[1] = _horizontalTimer; break;
case 0x14: _ballPosition = _horizontalTimer; break;
case 0x1b:
case 0x1c: {
case 0x1c:
_ballGraphicsEnable = _ballGraphicsEnableLatch;
case 0x1b: {
int index = (address & 0x3f) - 0x1b;
_playerGraphicsLatch[index] = *value;
if(!(_playerGraphicsLatchEnable[index]&1))
_playerGraphics[index] = _playerGraphicsLatch[index];
if(_playerGraphicsLatchEnable[index^1]&1)
_playerGraphics[index^1] = _playerGraphicsLatch[index^1];
_playerGraphics[index^1] = _playerGraphicsLatch[index^1];
} break;
case 0x1d: _missileGraphicsEnable[0] = *value; break;
case 0x1e: _missileGraphicsEnable[1] = *value; break;
case 0x1f: _ballGraphicsEnable = *value; break;
case 0x1f:
_ballGraphicsEnableLatch = *value;
if(!(_ballGraphicsEnableDelay&1))
_ballGraphicsEnable = _ballGraphicsEnableLatch;
break;
case 0x20: _playerMotion[0] = *value; break;
case 0x21: _playerMotion[1] = *value; break;

2
Machines/Atari2600.hpp
View File

@ -61,7 +61,7 @@ class Machine: public CPU6502::Processor<Machine> {
uint8_t _missileMotion[2];
// ball registers
uint8_t _ballGraphicsEnable;
uint8_t _ballGraphicsEnable, _ballGraphicsEnableLatch;
uint8_t _ballPosition;
uint8_t _ballMotion;
uint8_t _ballGraphicsEnableDelay;