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Added a test of interrupt mode 1.

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This commit is contained in:
Thomas Harte 2017-06-03 18:16:13 -04:00
parent 8c41a0f0ed
commit e52892f75b
1 changed files with 33 additions and 0 deletions
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33
OSBindings/Mac/Clock SignalTests/Z80InterruptTests.swift
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@ -73,4 +73,37 @@ class Z80InterruptTests: XCTestCase {
XCTAssertEqual(machine.value(for: .programCounter), 0x0105)
}
func testIRQMode1() {
let machine = CSTestMachineZ80()
// start the PC at 0x0100 and install three NOPs for it, ensuring interrupts are enabled
// and in mode 1
machine.setValue(0x0100, for: .programCounter)
machine.setValue(1, for: .IFF1)
machine.setValue(1, for: .IM)
machine.setValue(0x00, atAddress: 0x0100)
machine.setValue(0x00, atAddress: 0x0101)
machine.setValue(0x00, atAddress: 0x0102)
// put the stack at the top of memory
machine.setValue(0, for: .stackPointer)
// run for four cycles, and signal an IRQ
machine.runForNumber(ofCycles: 4)
machine.irqLine = true
// run for four more cycles to get to where the IRQ should be recognised
machine.runForNumber(ofCycles: 4)
XCTAssertEqual(machine.value(for: .programCounter), 0x0102)
// run for eleven more cycles to allow the IRQ to begin
machine.runForNumber(ofCycles: 13)
// confirm that the PC is now at 0x38, that the old is on the stack and
// that interrupts are now disabled
XCTAssertEqual(machine.value(for: .programCounter), 0x38)
XCTAssertEqual(machine.value(atAddress: 0xffff), 0x01)
XCTAssertEqual(machine.value(atAddress: 0xfffe), 0x02)
XCTAssertEqual(machine.value(for: .IFF1), 0)
}
}