diff --git a/modules/pdp11/lib/bus.js b/modules/pdp11/lib/bus.js
index ea55b9eff..aff9285a7 100644
--- a/modules/pdp11/lib/bus.js
+++ b/modules/pdp11/lib/bus.js
@@ -199,46 +199,34 @@ BusPDP11.IOHANDLER = {
 /*
  * These are our custom IOController functions for all IOPAGE accesses.  They look up the IOPAGE
  * offset in the aIOHandlers table, and if an entry exists, they use the appropriate IOHANDLER indexes
- * (above) to locate the appropriate read/write handlers.
+ * (above) to locate the registered read/write handlers.  If no handler is found, then unknownAccess()
+ * is called, triggering a trap -- unless traps are disabled because direct access was requested
+ * (eg, by the Debugger).
  *
- * Note that we try to have reasonable fallbacks for byte reads when only word read handlers exist,
- * and word reads if only byte handlers exist.  Ditto for writes.  These fallbacks may not always be
- * appropriate; for example, when a byte write falls back to a word write, the address must be read
- * first, and depending on the underlying I/O device, that may or may not have side-effects.  It's really
- * up to the device to know whether that matters, and provide all the necessary handlers if it does.
+ * Handlers receive the original IOPAGE address that was used, although in most cases, it's ignored,
+ * because most handlers usually handle only one address.  Only handlers used for a range of addresses
+ * must pay attention to it.
+ *
+ * Note that these functions include fallbacks for byte reads when only word read handlers exist (by
+ * masking or shifting the result) and for word reads if only byte handlers exist (by combining bytes).
+ * Fallbacks for writes exist, too, but they are slightly more complicated, because a byte write using
+ * a word write handler requires reading the word first, and then updating the appropriate byte within
+ * that word.
+ *
+ * Those fallbacks may not always be appropriate; for example, byte writes to some device registers
+ * must be zero-extended to update the entire word.  For those cases, the fallback's "preliminary" read
+ * is issued with a zero address so that the handler can distinguish a normal read from one of these
+ * preliminary reads, and return an appropriate value for the update (ie, zero).
+ *
+ * If none of these fallback behaviors are appropriate, the device has a simple recourse: register
+ * handlers for all possible addresses and sizes.
  *
  * Unlike regular Memory blocks, IOPAGE accesses permit word accesses on ODD addresses; that works
- * just fine by registering WORD handlers for the appropriate ODD addresses.  What is unclear, however,
- * is what is exactly supposed to happen when the CPU reads or writes a BYTE from an ODD IOPAGE address;
- * it seems clear that our built-in fallbacks are NOT correct in all cases.
+ * just fine by registering WORD handlers for the appropriate ODD addresses.  For BYTE accesses, it
+ * depends.  For CPU register addresses, addIOHandlers() installs special byte handlers that perform
+ * either a simple word read or write.  Other addresses must be handled on case-by-case basis.
  *
- * For example, let's imagine that only read/write WORD handlers have been registered for ODD address
- * 177701 (ie, general register R1, set 0).  If a readByte(177701) request is made, we would fallback to
- * reading the word at 177700 and returning the high byte, but that would fetch the contents of general
- * register R0 instead of R1, which is clearly wrong.
- *
- * One solution is for the caller to register both BYTE and WORD handlers for ODD addresses, making
- * the caller responsible for the defining the correct behavior in all cases.  However, that's more work
- * for the caller, and we're just punting the problem instead of solving it.
- *
- * Another solution is for addIOHandlers() to detect the ODD address case, and install custom fallback
- * handlers for read and write BYTE accesses.  In the above example, the custom read BYTE handler could
- * invoke the read WORD handler and mask the result with 0xff, and the custom write BYTE handler could
- * first call the read WORD handler, insert the new data into the low byte of the result, and then
- * call the write WORD handler.
- *
- * However, that would produce inconsistent results between EVEN and ODD addresses in the register
- * address range (0o177700 through 0o177717), so I'm assuming that the correct solution is to install
- * alternate fallback BYTE handlers for ALL addresses in that range.  The alternate read BYTE handler will
- * mask its result with 0xff, and the alternate write BYTE handler will store the (zero-extended) byte to
- * the entire corresponding register.
- *
- * One of things that gives me pause about this solution is that it differs from the behavior of a MOVB
- * instruction when the destination is a general register, because MOVB always sign-extends the source byte
- * to a word; it does NOT zero-extend.  So it seems to strange to have a different MOVB behavior when the
- * destination register is specified using an IOPAGE address.  But, maybe that was by design.
- *
- * TODO: Another small potential improvement would be for addIOHandlers() to predefine fall-backs for all
+ * TODO: Another small potential improvement would be for addIOHandlers() to install fallbacks for ALL
  * missing handlers, in both the ODD and EVEN cases, so there's never a need to check each function index
  * before calling it.  However, since there's no avoiding checking aIOHandlers[off] (unless we FULLY populate
  * the aIOHandlers array), and since these I/O accesses should be pretty infrequent relative to all other
@@ -336,6 +324,10 @@ BusPDP11.IOController = {
              * If no handler existed, and this address was odd, then perhaps a handler exists for the even address;
              * if so, call the readWord() handler first to get the original data, then call writeWord() with the new
              * data pre-inserted in (the high byte of) the original data.
+             *
+             * WARNING: Whenever we call readWord() under these circumstances, we zero the address parameter,
+             * so that the handler can distinguish this case.  Thus, if we're dealing with a special register
+             * where a byte write operation modifies the entire register, the handler can simply return zero.
              */
             afn = bus.aIOHandlers[off & ~0x1];
             if (afn) {
@@ -484,7 +476,7 @@ BusPDP11.prototype.setIOPageRange = function(nRange)
 /**
  * getControllerBuffer(addr)
  *
- * Our Bus component also acts as custom memory controller, so it must also provide this function.
+ * Our Bus component also acts as custom memory controller for the IOPAGE, so it must also provide this function.
  *
  * @this {BusPDP11}
  * @param {number} addr
@@ -493,7 +485,7 @@ BusPDP11.prototype.setIOPageRange = function(nRange)
 BusPDP11.prototype.getControllerBuffer = function(addr)
 {
     /*
-     * No buffer is required; all accesses go to a registered I/O handler or the bit-bucket.
+     * No buffer is required for the IOPAGE; all accesses go to registered I/O handlers or to unknownAccess().
      */
     return [null, 0];
 };
@@ -501,7 +493,7 @@ BusPDP11.prototype.getControllerBuffer = function(addr)
 /**
  * getControllerAccess()
  *
- * Our Bus component also acts as custom memory controller, so it must also provide this function.
+ * Our Bus component also acts as custom memory controller for the IOPAGE, so it must also provide this function.
  *
  * @this {BusPDP11}
  * @return {Array.<function()>}
@@ -511,6 +503,17 @@ BusPDP11.prototype.getControllerAccess = function()
     return this.afnIOPage;
 };
 
+/**
+ * getWidth()
+ *
+ * @this {BusPDP11}
+ * @return {number}
+ */
+BusPDP11.prototype.getWidth = function()
+{
+    return this.nBusWidth;
+};
+
 /**
  * reset()
  *
@@ -530,9 +533,7 @@ BusPDP11.prototype.reset = function()
  * unknownAccess(addr, data, byteFlag)
  *
  * This is our default I/O handler, called whenever there's an IOPAGE access without a corresponding entry
- * in aIOHandlers; in the interim, our Device component will override this default handler with its own function
- * by calling addIODefaultHandlers(), until the Device component has been completely rewritten to install I/O
- * handlers for all supported I/O addresses.
+ * in aIOHandlers.
  *
  * @this {BusPDP11}
  * @param {number} addr (ie, an IOPAGE address)
@@ -757,17 +758,6 @@ BusPDP11.prototype.scanMemory = function(info, addr, size)
     return info;
 };
 
-/**
- * getWidth()
- *
- * @this {BusPDP11}
- * @return {number}
- */
-BusPDP11.prototype.getWidth = function()
-{
-    return this.nBusWidth;
-};
-
 /**
  * removeMemory(addr, size)
  *
diff --git a/modules/pdp11/lib/cpustate.js b/modules/pdp11/lib/cpustate.js
index 2f37706c9..1d07478c5 100644
--- a/modules/pdp11/lib/cpustate.js
+++ b/modules/pdp11/lib/cpustate.js
@@ -83,15 +83,37 @@ function CPUStatePDP11(parmsCPU)
 
 Component.subclass(CPUStatePDP11, CPUPDP11);
 
+/*
+ * Overview of Device Interrupt Support
+ *
+ * Originally, the CPU maintained a queue of requested interrupts.  Entries in this queue recorded a device's
+ * priority, vector, and delay (ie, a number of instructions to process before issuing the interrupt).  This queue
+ * would constantly grow and shrink as requests were issued and dispatched, and as long as there was something
+ * in the queue, the CPU was constantly examining it.
+ *
+ * Now we are trying something simpler.  First, the CPU offers timer services to any device that wants a callback
+ * after a specified delay, which are much more efficient than requiring the CPU to dive into an interrupt queue and
+ * look for (and decrement) delay counts on every instruction.
+ *
+ * Second, when a device decides it's time to interrupt (either at the end of some operation or when its delay timer
+ * has fired), it will simply request the interrupt, and CPU priority permitting, the interrupt will be dispatched.
+ * If CPU priority is NOT permitting, then the interrupt will remain pending until the priority drops.  This means
+ * that the CPU need not check for any pending interrupts until/unless the CPU priority changes.
+ *
+ * All this will be managed with "triggers".  Every device that wants to interrupt must register via addTrigger().
+ * This will add a Trigger object to an array, and each object will contain the (self) assigned vector, the priority,
+ * the interrupt request status, and a next pointer.
+ */
+
 /**
  * @typedef {{
- *  delay: number,
- *  priority: number,
  *  vector: number,
- *  callback: (function()|null|undefined)
- * }} InterruptEvent
+ *  priority: number,
+ *  request: number,
+ *  next: (Trigger|null)
+ * }} Trigger
  */
-var InterruptEvent;
+var Trigger;
 
 /**
  * initProcessor()
@@ -101,7 +123,15 @@ var InterruptEvent;
 CPUStatePDP11.prototype.initProcessor = function()
 {
     this.decode = PDP11.op1170.bind(this);
+
+    /** @type {Array.<Trigger>} */
+    this.aTriggers = [];
+
+    /** @type {Trigger|null} */
+    this.triggerNext = null;
+
     this.initRegs();
+
     this.flags.complete = this.flags.debugCheck = false;
 };
 
@@ -169,7 +199,7 @@ CPUStatePDP11.prototype.initRegs = function()
     this.regMB = 0;
 
     /*
-     * opFlags contains various triggers that stepCPU() needs to be aware of
+     * opFlags contains various conditions that stepCPU() needs to be aware of
      */
     this.opFlags = 0;
 
@@ -208,8 +238,6 @@ CPUStatePDP11.prototype.resetRegs = function()
     this.mmuMask = 0x3ffff;
     this.mmuMemorySize = BusPDP11.IOPAGE_18BIT;
 
-    /** @type {Array.<InterruptEvent>} */
-    this.interruptQueue = [];
     this.opFlags |= PDP11.OPFLAG.INTQ;
 
     if (this.bus) this.setMemoryAccess();
@@ -562,77 +590,131 @@ CPUStatePDP11.prototype.setSP = function(addr)
 };
 
 /**
- * interrupt(delay, priority, vector, callback)
- *
- * Interrupts are stored in a queue in delay order with the delay expressed as
- * a difference. For example if the delays were 0, 1, 0 then the first entry
- * is active and both the second and third are waiting for one more instruction
- * execution to become active.
+ * addTrigger(vector, priority)
  *
  * @this {CPUStatePDP11}
- * @param {number} delay
- * @param {number} priority
  * @param {number} vector
- * @param {function()} [callback]
+ * @param {number} priority
+ * @return {Trigger}
  */
-CPUStatePDP11.prototype.interrupt = function(delay, priority, vector, callback)
+CPUStatePDP11.prototype.addTrigger = function(vector, priority)
 {
-    var i = this.interruptQueue.length;
-    while (i-- > 0) {
-        if (this.interruptQueue[i].vector === vector) {
-            if (i > 0) {
-                this.interruptQueue[i - 1].delay += this.interruptQueue[i].delay;
-            }
-            this.interruptQueue.splice(i, 1);
-            break;
-        }
-    }
-    if (delay >= 0) {
-        i = this.interruptQueue.length;                 // queue in delay 'difference' order
-        while (i-- > 0) {
-            if (this.interruptQueue[i].delay > delay) {
-                this.interruptQueue[i].delay -= delay;
-                break;
-            }
-            delay -= this.interruptQueue[i].delay;
-        }
-        /*
-         * NOTE regarding a Google Closure Compiler "bug": if an InterruptEvent is inserted into the
-         * interruptQueue with the named properties below, they will never be seen by the rest of the
-         * code, because the compiler renames all other property references EXCEPT these.
-         *
-         *      this.interruptQueue.splice(i + 1, 0, {
-         *          "delay": delay,
-         *          "priority": (priority << 5) & 0xe0,
-         *          "vector": vector,
-         *          "callback": callback
-         *      });
-         *
-         * Perhaps if the inlined object had been explicitly @typed, that wouldn't have happened, but
-         * I'm playing it safe now: I've taken the object out-of-line, removed the quoted property names,
-         * and explicitly typed it.  The compiler re-inlines the object with correctly renamed properties.
-         */
-        /** @type {InterruptEvent} */
-        var interruptEvent = {
-            delay: delay,
-            priority: (priority << 5) & 0xe0,
-            vector: vector,
-            callback: callback
-        };
-        this.interruptQueue.splice(i + 1, 0, interruptEvent);
-    }
-    this.opFlags |= PDP11.OPFLAG.INTQ;
+    var trigger = {vector: vector, priority: priority, request: -1, next: null};
+    this.aTriggers.push(trigger);
+    return trigger;
 };
 
 /**
- * checkInterruptQueue()
+ * checkTriggers()
  *
  * @this {CPUStatePDP11}
  */
-CPUStatePDP11.prototype.checkInterruptQueue = function()
+CPUStatePDP11.prototype.checkTriggers = function()
+{
+    if (this.triggerNext && this.setTrigger(this.triggerNext)) {
+        this.removeTrigger(this.triggerNext);
+    }
+};
+
+/**
+ * insertTrigger(trigger)
+ *
+ * @this {CPUStatePDP11}
+ * @param {Trigger} trigger
+ */
+CPUStatePDP11.prototype.insertTrigger = function(trigger)
+{
+    if (trigger != this.triggerNext) {
+        var triggerPrev = this.triggerNext;
+        if (!triggerPrev || triggerPrev.priority <= trigger.priority) {
+            trigger.next = triggerPrev;
+            this.triggerNext = trigger;
+        } else {
+            do {
+                var triggerNext = triggerPrev.next;
+                if (!triggerNext || triggerNext.priority <= trigger.priority) {
+                    trigger.next = triggerNext;
+                    triggerPrev.next = trigger;
+                    break;
+                }
+                triggerPrev = triggerNext;
+            } while (true);
+        }
+    }
+};
+
+/**
+ * removeTrigger(trigger)
+ *
+ * @this {CPUStatePDP11}
+ * @param {Trigger} trigger
+ */
+CPUStatePDP11.prototype.removeTrigger = function(trigger)
+{
+    var triggerPrev = this.triggerNext;
+    if (triggerPrev == trigger) {
+        this.triggerNext = trigger.next;
+    } else {
+        do {
+            var triggerNext = triggerPrev.next;
+            if (triggerNext == trigger) {
+                triggerPrev.next = triggerNext.next;
+                break;
+            }
+            triggerPrev = triggerNext;
+        } while (true);
+    }
+};
+
+/**
+ * setTrigger(trigger)
+ *
+ * @this {CPUStatePDP11}
+ * @param {Trigger|null} trigger
+ * @return {boolean} (true if interrupt dispatched, false if not)
+ */
+CPUStatePDP11.prototype.setTrigger = function(trigger)
+{
+    if (!this.dispatchInterrupt(trigger.vector, trigger.priority)) {
+        this.insertTrigger(trigger);
+        return false;
+    }
+    return true;
+};
+
+/**
+ * dispatchInterrupt(vector, priority)
+ *
+ * @this {CPUStatePDP11}
+ * @param {number} vector
+ * @param {number} priority
+ * @return {boolean} (true if dispatched, false if not)
+ */
+CPUStatePDP11.prototype.dispatchInterrupt = function(vector, priority)
+{
+    var priorityCPU = (this.regPSW & PDP11.PSW.PRI) >> PDP11.PSW.SHIFT.PRI;
+    if (priority > priorityCPU) {
+        if (this.opFlags & PDP11.OPFLAG.WAIT) {
+            this.advancePC(2);
+            this.opFlags &= ~PDP11.OPFLAG.WAIT;
+        }
+        this.trap(vector, PDP11.REASON.INTERRUPT);
+        return true;
+    }
+    return false;
+};
+
+/**
+ * checkInterrupts()
+ *
+ * @this {CPUStatePDP11}
+ */
+CPUStatePDP11.prototype.checkInterrupts = function()
 {
     if (this.opFlags & PDP11.OPFLAG.INTQ) {
         this.opFlags &= ~PDP11.OPFLAG.INTQ;
+        this.checkTriggers();
+        /*
         var interruptEvent = null;
         var savePSW = this.regPIR & 0xe0;
         for (var i = this.interruptQueue.length; --i >= 0;) {
@@ -666,6 +748,7 @@ CPUStatePDP11.prototype.checkInterruptQueue = function()
                 this.trap(interruptEvent.vector, PDP11.REASON.INTERRUPT);
             }
         }
+        */
     }
     else if (this.opFlags & PDP11.OPFLAG.INTQ_SPL) {
         /*
@@ -735,7 +818,7 @@ CPUStatePDP11.prototype.setPSW = function(newPSW)
         this.regsGen[6] = this.regsAltStack[this.mmuMode];
     }
     /*
-     * Trigger a call to checkInterruptQueue()
+     * Trigger a call to checkInterrupts()
      */
     this.opFlags |= PDP11.OPFLAG.INTQ;
     this.regPSW = newPSW;
@@ -1017,7 +1100,7 @@ CPUStatePDP11.prototype.trap = function(vector, reason)
         }
     }
 
-    throw vector;
+    if (reason != PDP11.REASON.INTERRUPT) throw vector;
 };
 
 /**
@@ -1891,7 +1974,7 @@ CPUStatePDP11.prototype.stepCPU = function(nMinCycles)
              * interrupting the natural flow of instructions whenever the Debugger is stepping through code.
              */
             if ((this.opFlags & (PDP11.OPFLAG.INTQ_SPL | PDP11.OPFLAG.INTQ | PDP11.OPFLAG.WAIT)) /*&& nMinCycles*/) {
-                this.checkInterruptQueue();
+                this.checkInterrupts();
             }
         }
 
diff --git a/modules/pdp11/lib/defines.js b/modules/pdp11/lib/defines.js
index cf4a188f0..e1581ea45 100644
--- a/modules/pdp11/lib/defines.js
+++ b/modules/pdp11/lib/defines.js
@@ -506,7 +506,6 @@ var PDP11 = {
         PRI:        4,
         RVEC:       0o60,
         XVEC:       0o64,
-        DELAY:      40,
         RCSR: {                 // 177560
             RE:     0x0001,     // Reader Enable (W/O)              TODO: Determine if we really need to exclude this write-only bit from RMASK
             DTR:    0x0002,     // Data Terminal Ready (R/W)
@@ -529,7 +528,8 @@ var PDP11 = {
             PARITY: 0x1000,     // Received Data Parity (R/O)
             FE:     0x2000,     // Framing Error (R/O)
             OE:     0x4000,     // Overrun Error (R/O)
-            ERROR:  0x8000      // Error (R/O)
+            ERROR:  0x8000,     // Error (R/O)
+            DELAY:  1
         },
         XCSR: {                 // 177564
             BREAK:  0x0001,     // BREAK (R/W)
@@ -538,11 +538,11 @@ var PDP11 = {
             READY:  0x0080,     // Transmitter Ready (R/O)
             RMASK:  0x00C5,
             WMASK:  0x0045,
-            DELAY:  8
+            DELAY:  1
         },
         XBUF: {                 // 177566
             DATA:   0x00FF,     // Transmitted Data (W/O)       TODO: Determine why pdp11.js effectively defined this as 0x7F
-            DELAY:  100
+            DELAY:  1
         }
     },
     KW11: {                     // KW11-L Line Time Clock
diff --git a/modules/pdp11/lib/device.js b/modules/pdp11/lib/device.js
index 8e2c4d877..bc8a5e0d7 100644
--- a/modules/pdp11/lib/device.js
+++ b/modules/pdp11/lib/device.js
@@ -125,10 +125,12 @@ DevicePDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
     this.dbg = dbg;
 
     var device = this;
-    this.kw11.timer = this.cpu.addTimer(function() {
+    this.kw11.timer = cpu.addTimer(function() {
         device.kw11_interrupt();
     });
 
+    this.kw11.trigger = cpu.addTrigger(PDP11.KW11.VEC, PDP11.KW11.PRI);
+
     bus.addIOTable(this, DevicePDP11.UNIBUS_IOTABLE);
     bus.addResetHandler(this.reset.bind(this));
 
@@ -1008,7 +1010,7 @@ DevicePDP11.prototype.kw11_interrupt = function()
 {
     this.kw11.lks |= PDP11.KW11.LKS.MON;
     if (this.kw11.lks & PDP11.KW11.LKS.IE) {
-        this.cpu.interrupt(PDP11.KW11.DELAY, PDP11.KW11.PRI, PDP11.KW11.VEC);
+        this.cpu.setTrigger(this.kw11.trigger);
         this.cpu.setTimer(this.kw11.timer, 1000/60);
     }
 };
diff --git a/modules/pdp11/lib/serialport.js b/modules/pdp11/lib/serialport.js
index cb43b4b04..98ae227dd 100644
--- a/modules/pdp11/lib/serialport.js
+++ b/modules/pdp11/lib/serialport.js
@@ -260,22 +260,28 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
 
     var serial = this;
 
-    this.timerReceiveData = this.cpu.addTimer(function() {
+    this.triggerReceiveInterrupt = this.cpu.addTrigger(PDP11.DL11.RVEC, PDP11.DL11.PRI);
+
+    this.timerReceiveInterrupt = this.cpu.addTimer(function() {
         if (!(serial.rcsr & PDP11.DL11.RCSR.RD)) {
             if (serial.abReceive.length) {
                 serial.rbuf = serial.abReceive.shift();
                 serial.rcsr |= PDP11.DL11.RCSR.RD;
                 if (serial.rcsr & PDP11.DL11.RCSR.RIE) {
-                    serial.cpu.interrupt(PDP11.DL11.DELAY, PDP11.DL11.PRI, PDP11.DL11.RVEC);
+                    serial.cpu.setTrigger(serial.triggerReceiveInterrupt);
                 }
             }
         }
     });
 
-    this.doneTransmitInterrupt = function() {
+    this.triggerTransmitInterrupt = this.cpu.addTrigger(PDP11.DL11.XVEC, PDP11.DL11.PRI);
+
+    this.timerTransmitInterrupt = this.cpu.addTimer(function() {
         serial.xcsr |= PDP11.DL11.XCSR.READY;
-        return !!(serial.xcsr & PDP11.DL11.XCSR.TIE);
-    };
+        if (serial.xcsr & PDP11.DL11.XCSR.TIE) {
+            serial.cpu.setTrigger(serial.triggerTransmitInterrupt);
+        }
+    });
 
     bus.addIOTable(this, SerialPortPDP11.UNIBUS_IOTABLE);
     this.setReady();
@@ -465,7 +471,7 @@ SerialPortPDP11.prototype.receiveData = function(data)
     else {
         this.abReceive = this.abReceive.concat(data);
     }
-    this.cpu.setTimer(this.timerReceiveData, 50);
+    this.cpu.setTimer(this.timerReceiveInterrupt, PDP11.DL11.RBUF.DELAY);
     return true;                // for now, return true regardless, since we're buffering everything anyway
 };
 
@@ -568,7 +574,7 @@ SerialPortPDP11.prototype.readRBUF = function(addr)
 {
     this.rcsr &= ~PDP11.DL11.RCSR.RD;
     if (this.abReceive.length > 0) {
-        this.cpu.setTimer(this.timerReceiveData, 50);
+        this.cpu.setTimer(this.timerReceiveInterrupt, PDP11.DL11.RBUF.DELAY);
     }
     return this.rbuf;
 };
@@ -609,7 +615,7 @@ SerialPortPDP11.prototype.writeXCSR = function(data, addr)
      * If the device is READY, and IE is transitioning on, then request an interrupt.
      */
     if ((this.xcsr & (PDP11.DL11.XCSR.READY | PDP11.DL11.XCSR.TIE)) == PDP11.DL11.XCSR.READY && (data & PDP11.DL11.XCSR.TIE)) {
-        this.cpu.interrupt(PDP11.DL11.XCSR.DELAY, PDP11.DL11.PRI, PDP11.DL11.XVEC, this.doneTransmitInterrupt);
+        this.cpu.setTimer(this.timerTransmitInterrupt, PDP11.DL11.XCSR.DELAY);
     }
     this.xcsr = (this.xcsr & ~PDP11.DL11.XCSR.WMASK) | (data & PDP11.DL11.XCSR.WMASK);
 };
@@ -639,7 +645,7 @@ SerialPortPDP11.prototype.writeXBUF = function(data, addr)
     if (data) {
         this.transmitByte(data);
         this.xcsr &= ~PDP11.DL11.XCSR.READY;
-        this.cpu.interrupt(PDP11.DL11.XBUF.DELAY, PDP11.DL11.PRI, PDP11.DL11.XVEC, this.doneTransmitInterrupt);
+        this.cpu.setTimer(this.timerTransmitInterrupt, PDP11.DL11.XBUF.DELAY);
     }
 };
 
diff --git a/versions/pdpjs/1.30.1/pdp11-dbg.js b/versions/pdpjs/1.30.1/pdp11-dbg.js
index 054b14111..001c2de09 100644
--- a/versions/pdpjs/1.30.1/pdp11-dbg.js
+++ b/versions/pdpjs/1.30.1/pdp11-dbg.js
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+function gb(a,b){if(a.v.wb)return a.v.fb=!1,a.v.wb=!1;if(a.v.error)return a.g(a.toString()+" error"),!1;a.v.fb=b;return a.v.fb}function hb(a,b){a.v.fb&&(b?a.v.wb=!0:void 0===b&&a.g(a.toString()+" busy"));return a.v.fb}function G(a){if(!a.v.error&&(a.v.ready=!0,a.v.ready)){var b=a.pb;a.pb=null;b&&b()}}function ib(a,b){b&&(a.v.ready?b():a.pb=b);return a.v.ready}function jb(a){return a.v.error?(a.g(a.toString()+" error"),!0):!1}function kb(a,b){a.v.error=!0;a.na(b)}
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