From a421ef693fd3b2d299856ab5b59cab4bc238ce7a Mon Sep 17 00:00:00 2001 From: Anonymus Raccoon Date: Tue, 25 Feb 2020 23:32:19 +0100 Subject: [PATCH] Starting the SBC instruction --- sources/CPU/CPU.hpp | 3 ++- sources/CPU/Instructions/MathematicalOperations.cpp | 5 +++++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/sources/CPU/CPU.hpp b/sources/CPU/CPU.hpp index ddd184a..23d1f83 100644 --- a/sources/CPU/CPU.hpp +++ b/sources/CPU/CPU.hpp @@ -393,7 +393,6 @@ namespace ComSquare::CPU //! @brief Return from Interrupt - Used to return from a interrupt handler. void RTI(); //! @brief Add with carry - Adds operand to the Accumulator; adds an additional 1 if carry is set. - //! @return The number of extra cycles that this operation took. void ADC(uint24_t valueAddr); //! @brief Store the accumulator to memory. void STA(uint24_t addr); @@ -461,6 +460,8 @@ namespace ComSquare::CPU void XCE(); //! @brief And accumulator with memory. void AND(uint24_t valueAddr); + //! @brief Subtract with Borrow from Accumulator. + void SBC(uint24_t valueAddr); public: explicit CPU(std::shared_ptr bus, Cartridge::Header &cartridgeHeader); CPU(const CPU &) = default; diff --git a/sources/CPU/Instructions/MathematicalOperations.cpp b/sources/CPU/Instructions/MathematicalOperations.cpp index 83455f8..8300f69 100644 --- a/sources/CPU/Instructions/MathematicalOperations.cpp +++ b/sources/CPU/Instructions/MathematicalOperations.cpp @@ -26,4 +26,9 @@ namespace ComSquare::CPU this->_registers.p.z = this->_registers.a == 0; this->_registers.p.n = this->_registers.a & negativeMask; } + + void CPU::SBC(uint24_t valueAddr) + { + + } } \ No newline at end of file