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Corrects direct addressing.

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This commit is contained in:
Thomas Harte 2020-10-08 20:00:01 -04:00
parent f8004d7096
commit 755627f12d
1 changed files with 3 additions and 2 deletions
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5
Processors/65816/Implementation/65816Implementation.hpp
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@ -268,7 +268,7 @@ template <typename BusHandler> void Processor<BusHandler>::run_for(const Cycles
continue;
case OperationConstructDirectX:
data_address_ = (direct_ + x()) & 0xffff;
data_address_ = (instruction_buffer_.value + direct_ + x()) & 0xffff;
incorrect_data_address_ = (direct_ & 0xff00) + (data_address_ & 0x00ff);
if(!(direct_&0xff)) {
++next_op_;
@ -276,7 +276,8 @@ template <typename BusHandler> void Processor<BusHandler>::run_for(const Cycles
continue;
case OperationConstructDirectY:
data_address_ = (direct_ + y()) & 0xffff;
data_address_ = (instruction_buffer_.value + direct_ + y()) & 0xffff;
// TODO: given the 16-bit internal arithmetic, confirm this is the correct spurious address.
incorrect_data_address_ = (direct_ & 0xff00) + (data_address_ & 0x00ff);
if(!(direct_&0xff)) {
++next_op_;