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Implements direct and final absolute test.

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This commit is contained in:
Thomas Harte 2020-10-14 20:57:47 -04:00
parent 979186e71d
commit db7178495f
1 changed files with 49 additions and 8 deletions
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57
OSBindings/Mac/Clock SignalTests/65816AddressingTests.swift
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@ -9,7 +9,7 @@
import Foundation
import XCTest
// This exactly transcribes the examples given in http://6502.org/tutorials/65c816opcodes.html#5.9
// This exactly transcribes the examples given in http://6502.org/tutorials/65c816opcodes.html#5
// Quoted text is taken verbatim from that document.
class WDC65816AddressingTests: XCTestCase {
@ -30,6 +30,22 @@ class WDC65816AddressingTests: XCTestCase {
// MARK: - Tests
func testAbsoluteJMP() {
// "If the K register is $12, then JMP $FFFF jumps to $12FFFF"
let machine = machine16()
machine.setValue(0x12, for: .programBank)
// JMP $ffff
machine.setData(Data([0x4c, 0xff, 0xff]), atAddress: 0x120200)
machine.setValue(0x200, for: .programCounter)
machine.runForNumber(ofCycles: 4)
XCTAssertEqual(machine.value(for: .programCounter), 0) // i.e. 0xffff + 1
XCTAssertEqual(machine.value(for: .programBank), 0x12)
}
func testAbsolute() {
// "If the DBR is $12 and the m flag is 0, then LDA $FFFF loads the low byte of
// the data from address $12FFFF, and the high byte from address $130000"
@ -122,17 +138,24 @@ class WDC65816AddressingTests: XCTestCase {
XCTAssertEqual(machine.value(for: .programBank), 0x12)
}
// TODO: all tests from this point downward.
func testAbsoluteJMP() {
// TODO.
// "If the K register is $12, then JMP $FFFF jumps to $12FFFF"
}
func testDirect8() {
// "If the D register is $FF00 and the e flag is 1 (note that
// this means the m flag must be 1), then LDA $FF loads the low
// byte of the data from address $00FFFF"
let machine = machine8()
machine.setValue(0xff00, for: .direct)
machine.setValue(0xab, forAddress: 0xffff)
// LDA $ff; NOP
machine.setData(Data([0xa5, 0xff, 0xea]), atAddress: 0x0200)
machine.setValue(0x200, for: .programCounter)
machine.runForNumber(ofCycles: 4)
XCTAssertEqual(machine.value(for: .A), 0xab)
}
func testDirect16() {
@ -140,8 +163,26 @@ class WDC65816AddressingTests: XCTestCase {
// this means the e flag must be 0), then LDA $FF loads the low
// byte of the data from address $00FFFF, and the high byte
// from address $000000"
let machine = machine16()
machine.setValue(0xff00, for: .direct)
machine.setValue(0xab, forAddress: 0xffff)
machine.setValue(0xcd, forAddress: 0x0000)
// LDA $ff; NOP
machine.setData(Data([0xa5, 0xff, 0xea]), atAddress: 0x0200)
machine.setValue(0x200, for: .programCounter)
machine.runForNumber(ofCycles: 5)
XCTAssertEqual(machine.value(for: .A), 0xcdab)
}
// TODO: all tests from this point downward.
func testDirextX8() {
// "If the D register is $FF00, the X register is $000A, and
// the e flag is 1 (note that this means the m flag must be 1),