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Applies indirect page zero emulation mode addressing constraint to ix addressing.

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Lorenz's LDA tests now pass in emulation mode.
This commit is contained in:
Thomas Harte 2020-10-09 23:22:48 -04:00
parent 92e72959c3
commit 290598429a
2 changed files with 9 additions and 1 deletions
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5
OSBindings/Mac/Clock SignalTests/WolfgangLorenzTests.swift
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@ -256,6 +256,11 @@ class WolfgangLorenzTests: XCTestCase, CSTestMachineTrapHandler {
machine.setValue(0x0801, for: .programCounter)
machine.setValue(0xfd, for: .stackPointer)
machine.setValue(0x04, for: .flags)
// For consistency when debugging; otherwise immaterial.
machine.setValue(0x00, for: .A)
machine.setValue(0x00, for: .X)
machine.setValue(0x00, for: .Y)
}
}

5
Processors/65816/Implementation/65816Implementation.hpp
View File

@ -249,7 +249,10 @@ template <typename BusHandler> void Processor<BusHandler>::run_for(const Cycles
continue;
case OperationConstructDirectIndexedIndirect:
data_address_ = data_bank_ + (direct_ + x() + instruction_buffer_.value) & 0xffff;
data_address_ = data_bank_ + (
((direct_ + x() + instruction_buffer_.value) & e_masks_[1]) +
(direct_ & e_masks_[0])
) & 0xffff;
if(!(direct_&0xff)) {
++next_op_;
}