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Reduces number of Apple II video flushes, to reduce processing cost.

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This commit is contained in:
Thomas Harte 2018-05-10 20:48:57 -04:00
parent 578a5b3e69
commit d16ae84d0b
1 changed files with 5 additions and 1 deletions
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6
Machines/AppleII/AppleII.cpp
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@ -173,7 +173,11 @@ class ConcreteMachine:
*/
MemoryBlock *block = nullptr;
if(address < 0x200) block = &memory_blocks_[0];
else if(address < 0xc000) {update_video(); block = &memory_blocks_[1]; address -= 0x200; }
else if(address < 0xc000) {
if(address < 0x6000 && !isReadOperation(operation)) update_video();
block = &memory_blocks_[1];
address -= 0x200;
}
else if(address < 0xd000) block = nullptr;
else if(address < 0xe000) {block = &memory_blocks_[2]; address -= 0xd000; }
else {block = &memory_blocks_[3]; address -= 0xe000; }