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Use correct timings in JMP #208

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Jan 26, 2020
Merged

Use correct timings in JMP #208

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6 changes: 3 additions & 3 deletions core/src/mos6502.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -206,10 +206,10 @@ Pipeline Mos6502::parse_next_instruction() {
result.push([=]() { stack_.push_byte(registers_->a); });
break;
case Instruction::JmpAbsolute:
result.push([=]() { ++registers_->pc; });
result.push([=]() { tmp_ = mmu_->read_byte(registers_->pc++); });
result.push([=]() {
registers_->pc =
mmu_->read_word(registers_->pc - static_cast<uint16_t>(1));
const uint16_t pch = mmu_->read_byte(registers_->pc) << 8u;
registers_->pc = pch | tmp_;
});
break;
case Instruction::BvcRelative:
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3 changes: 2 additions & 1 deletion core/test/src/test_cpu.cpp
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Expand Up @@ -1156,7 +1156,8 @@ TEST_F(CpuTest, jmp) {
stage_instruction(JMP);
expected.pc = 0x1234;

EXPECT_CALL(mmu, read_word(registers.pc + 1)).WillOnce(Return(0x1234));
EXPECT_CALL(mmu, read_byte(registers.pc + 1u)).WillOnce(Return(0x34));
EXPECT_CALL(mmu, read_byte(registers.pc + 2u)).WillOnce(Return(0x12));

step_execution(3);

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