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Made an attempt to implement Tigervision paging.

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This commit is contained in:
Thomas Harte 2017-03-11 17:44:35 -05:00
parent 38ce4dc56c
commit add14fb43a
1 changed files with 9 additions and 0 deletions
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9
Machines/Atari2600/Atari2600.cpp
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@ -211,6 +211,15 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
case 0x18: update_audio(); speaker_->set_divider(decodedAddress - 0x17, *value); break;
case 0x19:
case 0x1a: update_audio(); speaker_->set_volume(decodedAddress - 0x19, *value); break;
case 0x3f:
if(paging_model_ == StaticAnalyser::Atari2600PagingModel::Tigervision && (masked_address == 0x3f))
{
int selected_page = (*value) % (rom_size_ / 2048);
rom_pages_[0] = &rom_[selected_page * 2048];
rom_pages_[1] = rom_pages_[0] + 2048;
}
break;
}
}
}