tweak 6510 io port and fix overflow bug in TOD

src/main/kotlin/razorvine/c64emu/Cia.kt

@@ -52,6 +52,8 @@ class Cia(val number: Int, startAddress: Address, endAddress: Address, val cpu:
             if (updatedAt != latchedTime) {
                 updatedAt = latchedTime
                 var elapsedSeconds = (latchedTime.toDouble()-startedAt)/1000.0+userStartTime
+                if(elapsedSeconds>60*3600)
+                    elapsedSeconds=0.0      // TOD counds max 60 hours
                 hours = (elapsedSeconds/3600).toInt()
                 elapsedSeconds -= hours*3600
                 minutes = (elapsedSeconds/60).toInt()

src/main/kotlin/razorvine/c64emu/CpuIoPort.kt

@@ -1,6 +1,5 @@
 package razorvine.c64emu
 
-import razorvine.ksim65.Cpu6502
 import razorvine.ksim65.components.MemMappedComponent
 import razorvine.ksim65.components.UByte
 
@@ -9,10 +8,11 @@ import razorvine.ksim65.components.UByte
  * Controlling the memory layout, and cassette port (not processed at all).
  *
  */
-class CpuIoPort(val cpu: Cpu6502) : MemMappedComponent(0x0000, 0x0001) {
+class CpuIoPort : MemMappedComponent(0x0000, 0x0001) {
 
     private var dataDirections: Int = 0
-    private var ioPort: Int = 0xff
+    private var ioPort: Int = 0
+
     var loram: Boolean = false  // Bit 0: LORAM signal.  Selects ROM or RAM at 40960 ($A000).  1=BASIC, 0=RAM
         private set
     var hiram: Boolean = false  // Bit 1: HIRAM signal.  Selects ROM or RAM at 57344 ($E000).  1=Kernal, 0=RAM
@@ -28,8 +28,13 @@ class CpuIoPort(val cpu: Cpu6502) : MemMappedComponent(0x0000, 0x0001) {
     }
 
     override operator fun get(offset: Int): UByte {
-        return if(offset==0) dataDirections.toShort() else {
-            (ioPort or dataDirections.inv() and 0b00111111).toShort()
+        return if(offset==0) {
+            dataDirections.toShort()
+        } else {
+            if(dataDirections and 0b00100000 == 0)
+                (ioPort and 0b11011111).toShort()        // bit 5 is low when input
+            else
+                ioPort.toShort()
         }
     }
 
@@ -38,14 +43,14 @@ class CpuIoPort(val cpu: Cpu6502) : MemMappedComponent(0x0000, 0x0001) {
             dataDirections = data.toInt()
             determineRoms()
         } else {
-            ioPort = data.toInt()
+            ioPort = (ioPort and dataDirections.inv()) or (data.toInt() and dataDirections)
             determineRoms()
         }
     }
 
     private fun determineRoms() {
-        if (dataDirections and 0b00000001 != 0) loram = ioPort and 0b00000001 != 0
-        if (dataDirections and 0b00000010 != 0) hiram = ioPort and 0b00000010 != 0
-        if (dataDirections and 0b00000100 != 0) charen = ioPort and 0b00000100 != 0
+        loram = ioPort and 0b00000001 != 0
+        hiram = ioPort and 0b00000010 != 0
+        charen = ioPort and 0b00000100 != 0
     }
 }

src/main/kotlin/razorvine/c64emu/c64Main.kt

@@ -39,12 +39,12 @@ class C64Machine(title: String) : IVirtualMachine {
         it.load(kernalData)
     }
 
-    override val cpu = Cpu6502()
-    val cpuIoPort = CpuIoPort(cpu)
+    val cpuIoPort = CpuIoPort()
 
     // This bus contains "mmu" logic to control the memory bank switching controlled by the 6510's io port in $00/$01.
     // Therefore we provide it the various roms directly and not "connect" these to the bus in the default way.
     override val bus = Bus6510(cpuIoPort, chargenRom, basicRom, kernalRom)
+    override val cpu = Cpu6502()
 
     // the C64 has 64KB of RAM.  Some of it may be banked out and replaced by ROM.
     val ram = Ram(0x0000, 0xffff)

src/test/kotlin/Test6502TestSuiteC64Specific.kt

@@ -9,14 +9,11 @@ import razorvine.ksim65.components.Ram
 import razorvine.ksim65.components.Rom
 import kotlin.test.*
 
-// TODO: run these tests by using the C64 machine emulation components
-
 @Execution(ExecutionMode.CONCURRENT)
-@Disabled("need to fix more c64 specific stuff here")
 class Test6502TestSuiteC64Specific {
 
     val cpu: Cpu6502 = Cpu6502()
-    val ioPort = CpuIoPort(cpu)
+    val ioPort = CpuIoPort()
     val ram = Ram(0, 0xffff)
     val bus: Bus
     val kernalStubs = C64KernalStubs(ram)
@@ -108,106 +105,136 @@ class Test6502TestSuiteC64Specific {
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia1pb6() {
         runTest("cia1pb6")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia1pb7() {
         runTest("cia1pb7")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia1ta() {
         runTest("cia1ta")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia1tab() {
         runTest("cia1tab")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia1tb() {
         runTest("cia1tb")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia1tb123() {
         runTest("cia1tb123")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia2pb6() {
         runTest("cia2pb6")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia2pb7() {
         runTest("cia2pb7")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia2ta() {
         runTest("cia2ta")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia2tb() {
         runTest("cia2tb")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCia2tb123() {
         runTest("cia2tb123")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCntdef() {
         runTest("cntdef")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testCnto2() {
-        // todo fix: When the timer input is switched from o2 to CNT or from CNT back to o2, there must be a two clock delay until the switch is recognized.
         runTest("cnto2")
     }
 
     @Test
-    fun testCpuport() {
-        runTest("cpuport")
-    }
-
-    @Test
+    @Disabled("tests c64 specific hardware")
     fun testCputiming() {
-        runTest("cputiming")
+        runTest("cputiming")        // TODO fix this test once the cycle times are correct?
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testFlipos() {
         runTest("flipos")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testIcr01() {
         runTest("icr01")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testImr() {
         runTest("imr")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testIrq() {
         runTest("irq")
     }
 
     @Test
+    @Disabled("tests c64 specific hardware")
     fun testLoadth() {
         runTest("loadth")
     }
 
+    @Test
+    @Disabled("tests c64 specific hardware")
+    fun testNmi() {
+        runTest("nmi")
+    }
+
+    @Test
+    @Disabled("tests c64 specific hardware")
+    fun testOneshot() {
+        runTest("oneshot")
+    }
+
+    @Test
+    fun testCpuport() {
+        runTest("cpuport")
+    }
+
     @Test
     fun testMmu() {
         runTest("mmu")
@@ -217,14 +244,4 @@ class Test6502TestSuiteC64Specific {
     fun testMmufetch() {
         runTest("mmufetch")
     }
-
-    @Test
-    fun testNmi() {
-        runTest("nmi")
-    }
-
-    @Test
-    fun testOneshot() {
-        runTest("oneshot")
-    }
 }

src/test/kotlin/TestC64Components.kt

@@ -0,0 +1,88 @@
+import razorvine.c64emu.CpuIoPort
+import kotlin.test.*
+
+
+class TestC64Components {
+
+    @Test
+    fun testCpuIoPort() {
+        val io = CpuIoPort()
+        io.reset()
+
+        assertEquals(0xef, io[0])
+        assertEquals(0x37, io[1])
+
+        io[0] = 0b11111111
+        io[1] = 0b11111111
+        assertEquals(0b11111111,io[0])
+        assertEquals(0b11111111,io[1])
+        io[0] = 0
+        assertEquals(0b11011111,io[1], "bit 5 (cassette motor) is drawn low if input")
+        io[0] = 0b11111111
+        assertEquals(0b11111111,io[1], "bit 5 (cassette motor) is high if output")
+
+        io[1] = 0x37
+        io[0] = 0b00100000
+        assertEquals(0b00100000, io[0])
+        assertEquals(0x37, io[1])
+
+        io[0] = 0xff
+        assertEquals(0xff, io[0])
+        assertEquals(0x37, io[1])
+
+        io[1] = 0b11110000
+        assertEquals(0b11110000, io[1])
+
+        io[0] = 0b00100000
+        io[1] = 0b01010101
+        assertEquals(0b11010000, io[1])
+        io[0] = 0b00100001
+        assertEquals(0b11010000, io[1])
+        io[1] = 0b01010101
+        assertEquals(0b11010001, io[1])
+
+        io[0] = 0b11000011
+        assertEquals(0b11010001, io[1])
+        io[1] = 0b00100000
+        assertEquals(0b00010000, io[1])
+        io[1] = 0b11111111
+        assertEquals(0b11010011, io[1])
+    }
+
+    @Test
+    fun testRoms() {
+        val io = CpuIoPort()
+        io.reset()
+
+        assertTrue(io.loram)
+        assertTrue(io.hiram)
+        assertTrue(io.charen)
+
+        io[0] = 0
+        io[1] = 0
+        assertTrue(io.loram)
+        assertTrue(io.hiram)
+        assertTrue(io.charen)
+
+        io[0] = 255
+        assertTrue(io.loram)
+        assertTrue(io.hiram)
+        assertTrue(io.charen)
+        io[1] = 0b1111110
+        assertFalse(io.loram)
+        assertTrue(io.hiram)
+        assertTrue(io.charen)
+        io[1] = 0b1111101
+        assertTrue(io.loram)
+        assertFalse(io.hiram)
+        assertTrue(io.charen)
+        io[1] = 0b1111011
+        assertTrue(io.loram)
+        assertTrue(io.hiram)
+        assertFalse(io.charen)
+
+    }
+
+}
+
+