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Added CLI/SEI pair test.

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This commit is contained in:
Thomas Harte 2016-06-29 19:42:39 -04:00
parent db7c6430b5
commit b322baff2f
1 changed files with 26 additions and 1 deletions
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27
OSBindings/Mac/Clock SignalTests/6502InterruptTests.swift
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@ -32,7 +32,7 @@ class MOS6502InterruptTests: XCTestCase {
}
func testIRQLine() {
// run for four cycles; check that no interrupt has occurred
// run for six cycles; check that no interrupt has occurred
machine.runForNumberOfCycles(6)
XCTAssert(machine.valueForRegister(.ProgramCounter) == 0x4003, "No interrupt should have occurred with line low")
@ -45,4 +45,29 @@ class MOS6502InterruptTests: XCTestCase {
machine.runForNumberOfCycles(7)
XCTAssert(machine.valueForRegister(.ProgramCounter) == 0x1234, "Interrupt routine should just have begun")
}
func testIFlagSet() {
// enable the interrupt line, run for eleven cycles to get past the CLIP and the following NOP and into the interrupt routine
machine.irqLine = true
machine.runForNumberOfCycles(11)
XCTAssert(machine.valueForRegister(.ProgramCounter) == 0x1234, "Interrupt routine should just have begun")
XCTAssert(machine.valueForRegister(.Flags) & 0x04 == 0x04, "Interrupt status flag should be set")
}
func testCLISEIFlagClear() {
// set up an SEI as the second instruction, enable the IRQ line
machine.setValue(0x78, forAddress: 0x4001)
machine.irqLine = true
// run for four cycles; the CLI and SEI should have been performed
machine.runForNumberOfCycles(4)
XCTAssert(machine.valueForRegister(.ProgramCounter) == 0x4002, "CLI/SEI pair should have been performed in their entirety")
// run for seven more cycles
machine.runForNumberOfCycles(7)
// interrupt should have taken place despite SEI
XCTAssert(machine.valueForRegister(.ProgramCounter) == 0x1234, "Interrupt routine should just have begun")
}
}