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Limit to 14 bits in old modes.

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This commit is contained in:
Thomas Harte 2023-02-06 22:16:31 -05:00
parent 7cb51c021b
commit 7028bdd05d
1 changed files with 5 additions and 0 deletions
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5
Components/9918/Implementation/9918Base.hpp
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@ -813,6 +813,11 @@ template <Personality personality> struct Base: public Storage<personality> {
++ram_pointer_; ++ram_pointer_;
if constexpr (is_yamaha_vdp(personality)) { if constexpr (is_yamaha_vdp(personality)) {
// The Yamaha increments only 14 bits of the address in TMS-compatible modes.
if(this->underlying_mode_ < ScreenMode::YamahaText80) {
ram_pointer_ = (ram_pointer_ & 0x3fff) | (address & AddressT(~0x3fff));
}
if(this->underlying_mode_ == ScreenMode::YamahaGraphics6 || this->underlying_mode_ == ScreenMode::YamahaGraphics7) { if(this->underlying_mode_ == ScreenMode::YamahaGraphics6 || this->underlying_mode_ == ScreenMode::YamahaGraphics7) {
// Rotate address one to the right as the hardware accesses // Rotate address one to the right as the hardware accesses
// the underlying banks of memory alternately but presents // the underlying banks of memory alternately but presents