diff --git a/apps/pdp10/tests/optest-v01.json b/apps/pdp10/tests/optest-v01.json
index 84c4d16a6..d9fa6facd 100644
--- a/apps/pdp10/tests/optest-v01.json
+++ b/apps/pdp10/tests/optest-v01.json
@@ -35,5 +35,13 @@
 //  14=444444777777 15=777777777777 16=777777777777 17=000000000000
 //
     0o262240000005,   // 000116: POP     5,5
+//
+//  00=111111444444 01=777777444444 02=777777444444 03=777777444444
+//  04=444444777777 05=111110444443 06=777777777777 07=000000000000
+//  10=000000000010 11=111111444444 12=444444111111 13=777777444444
+//  14=444444777777 15=777777777777 16=777777777777 17=000000000000
+//
+    0o515040170600,   // 000117: HRLZI   1,170600
+    0o135100000001,   // 000120: LDB     2,1
   ]
 }
diff --git a/modules/pdp10/lib/cpuops.js b/modules/pdp10/lib/cpuops.js
index 3227a3830..75a7fda9c 100644
--- a/modules/pdp10/lib/cpuops.js
+++ b/modules/pdp10/lib/cpuops.js
@@ -188,11 +188,27 @@ PDP10.opFSC = function(op, acc)
  */
 PDP10.opIBP = function(op, acc)
 {
-    this.opUndefined(op);
+    var w = this.readWord(this.regEA);
+    var p = (w / PDP10.OPCODE.P_SCALE) & PDP10.OPCODE.P_MASK;
+    var s = (w >> PDP10.OPCODE.S_SHIFT) & PDP10.OPCODE.S_MASK;
+    p -= s;
+    if (p < 0) {
+        p = 36 - s;
+        w++;
+    }
+    w = (p * PDP10.OPCODE.P_SCALE) + (s << PDP10.OPCODE.S_SHIFT) + (w & PDP10.OPCODE.PTR_MASK);
+    this.writeWord(this.regEA, w);
 };
 
 /**
- * opILDB(0o134000)
+ * opILDB(0o134000): Increment Pointer and Load Byte
+ *
+ * From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
+ *
+ *      Increment the byte pointer in location E as explained above. Then retrieve a byte of S bits from the
+ *      location and position specified by the newly incremented pointer, load it into the right end of AC,
+ *      and clear the remaining AC bits.  The location containing the byte is unaffected, the original contents
+ *      of AC are lost.
  *
  * @this {CPUStatePDP10}
  * @param {number} op
@@ -200,11 +216,30 @@ PDP10.opIBP = function(op, acc)
  */
 PDP10.opILDB = function(op, acc)
 {
-    this.opUndefined(op);
+    /*
+     * We're called in two phases: phase 1 is with regEA containing the address of the pointer, and phase 2
+     * is with regEA containing the address of the bits to be loaded.
+     *
+     * We can implement this as a simple combination of opIBP() and opLDB(), but taking care that we only call
+     * opIBP() on phase 1.
+     */
+    if (this.regPS < 0) {
+        //noinspection JSUnresolvedFunction
+        PDP10.opIBP.call(this, op, acc);
+    }
+
+    //noinspection JSUnresolvedFunction
+    PDP10.opLDB.call(this, op, acc);
 };
 
 /**
- * opLDB(0o135000)
+ * opLDB(0o135000): Load Byte
+ *
+ * From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
+ *
+ *      Retrieve a byte of S bits from the location and position specified by the pointer contained in location E,
+ *      load it into the right end of AC, and clear the remaining AC bits.  The location containing the byte is unaffected,
+ *      the original contents of AC are lost.
  *
  * @this {CPUStatePDP10}
  * @param {number} op
@@ -212,23 +247,67 @@ PDP10.opILDB = function(op, acc)
  */
 PDP10.opLDB = function(op, acc)
 {
-    this.opUndefined(op);
+    /*
+     * We're called in two phases: phase 1 is with regEA containing the address of the pointer, and phase 2
+     * is with regEA containing the address of the bits to be loaded.
+     */
+    var w = this.readWord(this.regEA);
+    if (this.regPS < 0) {
+        this.regPS = w;
+        this.regRA = this.regEA | PDP10.OPCODE.I_BIT;
+        this.advancePC(-1);
+        return;
+    }
+    var p = (this.regPS / PDP10.OPCODE.P_SCALE) & PDP10.OPCODE.P_MASK;
+    var s = (this.regPS >> PDP10.OPCODE.S_SHIFT) & PDP10.OPCODE.S_MASK;
+    if (p + s <= 32) {
+        w = (w >> p) & ((1 << s) - 1);
+    } else {
+        w = Math.trunc(w / Math.pow(2, p)) % Math.pow(2, s);
+    }
+    this.writeWord(acc, w);
+    this.regPS = -1;
 };
 
 /**
  * opIDPB(0o136000)
  *
+ * From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
+ *
+ *      Increment the byte pointer in location E as explained above.  Then deposit the right S bits of AC into
+ *      the location and position specified by the newly incremented pointer.  The original contents of the bits
+ *      that receive the byte are lost, AC and the remaining bits of the deposit location are unaffected.
+ *
  * @this {CPUStatePDP10}
  * @param {number} op
  * @param {number} acc
  */
 PDP10.opIDPB = function(op, acc)
 {
-    this.opUndefined(op);
+    /*
+     * We're called in two phases: phase 1 is with regEA containing the address of the pointer, and phase 2
+     * is with regEA containing the address of the bits to be stored.
+     *
+     * We can implement this as a simple combination of opIBP() and opDDB(), but taking care that we only call
+     * opIBP() on phase 1.
+     */
+    if (this.regPS < 0) {
+        //noinspection JSUnresolvedFunction
+        PDP10.opIBP.call(this, op, acc);
+    }
+
+    //noinspection JSUnresolvedFunction
+    PDP10.opDPB.call(this, op, acc);
 };
 
 /**
- * opDPB(0o137000)
+ * opDPB(0o137000): Deposit Byte
+ *
+ * From the DEC PDP-10 System Reference Manual (May 1968), p. 2-16:
+ *
+ *      Deposit the right S bits of AC into the location and position specified by the pointer contained
+ *      in location E.  The original contents of the bits that receive the byte are lost, AC and the remaining
+ *      bits of the deposit location are unaffected.
  *
  * @this {CPUStatePDP10}
  * @param {number} op
@@ -236,7 +315,23 @@ PDP10.opIDPB = function(op, acc)
  */
 PDP10.opDPB = function(op, acc)
 {
-    this.opUndefined(op);
+    /*
+     * We're called in two phases: phase 1 is with regEA containing the address of the pointer, and phase 2
+     * is with regEA containing the address of the bits to be stored.
+     */
+    var w = this.readWord(this.regEA);
+    if (this.regPS < 0) {
+        this.regPS = w;
+        this.regRA = this.regEA | PDP10.OPCODE.I_BIT;
+        this.advancePC(-1);
+        return;
+    }
+    var p = (this.regPS / PDP10.OPCODE.P_SCALE) & PDP10.OPCODE.P_MASK;
+    var s = (this.regPS >> PDP10.OPCODE.S_SHIFT) & PDP10.OPCODE.S_MASK;
+    var b = (this.readWord(acc) % Math.pow(2, s)) * Math.pow(2, p);
+    w = (w - (w % Math.pow(2, p + s))) + b + (w % Math.pow(2, p));
+    this.writeWord(this.regEA, w);
+    this.regPS = -1;
 };
 
 /**
diff --git a/modules/pdp10/lib/cpustate.js b/modules/pdp10/lib/cpustate.js
index c444ddc93..c9270a644 100644
--- a/modules/pdp10/lib/cpustate.js
+++ b/modules/pdp10/lib/cpustate.js
@@ -178,6 +178,12 @@ class CPUStatePDP10 extends CPUPDP10 {
         this.regPC = this.lastPC = this.addrReset;
         this.fOverflow = this.fCarry0 = this.fCarry1 = this.fNoDivide = this.fPDOverflow = false;
 
+        /*
+         * This next two internal regs are used only with byte instructions, to record an active byte
+         * pointer state (regPS) and pointer address (regPA).
+         */
+        this.regPS = this.regPA = -1;
+
         /*
          * This is queried and displayed by the Panel when it's not displaying its own ADDRESS register
          * (which takes precedence when, for example, you've manually halted the CPU and are independently
@@ -279,6 +285,8 @@ class CPUStatePDP10 extends CPUPDP10 {
         state.set(0, [
             this.regEA,
             this.regRA,
+            this.regPS,
+            this.regPA,
             this.regOP,
             this.regPC,
             this.lastPC,
@@ -308,6 +316,8 @@ class CPUStatePDP10 extends CPUPDP10 {
         [
             this.regEA,
             this.regRA,
+            this.regPS,
+            this.regPA,
             this.regOP,
             this.regPC,
             this.lastPC,
@@ -369,7 +379,7 @@ class CPUStatePDP10 extends CPUPDP10 {
         if (this.regRA & PDP10.OPCODE.I_BIT) return -1;
 
         this.regPC = (this.regPC + 1) % PDP10.ADDR_LIMIT;
-        return (this.regOP / PDP10.OPCODE.ACSHIFT)|0;
+        return (this.regOP / PDP10.OPCODE.A_SCALE)|0;
     }
 
     /**
diff --git a/modules/pdp10/lib/debugger.js b/modules/pdp10/lib/debugger.js
index 8cd2d3184..c04ad0bb0 100644
--- a/modules/pdp10/lib/debugger.js
+++ b/modules/pdp10/lib/debugger.js
@@ -1415,7 +1415,7 @@ class DebuggerPDP10 extends Debugger {
     findInstruction(opCode, fOperands = true)
     {
         var opNum, opMask, aModes, iMode = 0;
-        var op = (opCode / PDP10.OPCODE.OPSHIFT)|0;
+        var op = (opCode / PDP10.OPCODE.OP_SCALE)|0;
 
         for (var mask in DebuggerPDP10.OPTABLE) {
             var opMasks = DebuggerPDP10.OPTABLE[mask];
@@ -1423,7 +1423,7 @@ class DebuggerPDP10 extends Debugger {
             if (opNum) {
                 opMask = +mask;
                 /*
-                 * When we extracted op from opCode using OPSHIFT, we included 6 additional bits
+                 * When we extracted op from opCode using OP_SCALE, we included 6 additional bits
                  * to help distinguish OPIO instructions from non-OPIO instructions.  But for the
                  * following tests, we don't need those bits, so we get rid of them now.
                  */
@@ -1458,7 +1458,7 @@ class DebuggerPDP10 extends Debugger {
                 sOperation += this.toStrWord(opCode);
             } else {
                 if (opMask == PDP10.OPCODE.OPIO) {
-                    sOperation += this.toStrBase((opCode / PDP10.OPCODE.IOSHIFT) & PDP10.OPCODE.IOMASK, -1);
+                    sOperation += this.toStrBase((opCode / PDP10.OPCODE.IO_SCALE) & PDP10.OPCODE.IO_MASK, -1);
                 } else {
                     sOperation += this.toStrBase((opCode >> PDP10.OPCODE.A_SHIFT) & PDP10.OPCODE.A_MASK, -1);
                 }
@@ -1564,7 +1564,7 @@ class DebuggerPDP10 extends Debugger {
                         } else {
                             opMode = ((iMode & 0o3) << 1) | ((iMode & 0o14) << 2);
                         }
-                        opCode = (op | (opMode << 6)) * PDP10.OPCODE.OPSHIFT;
+                        opCode = (op | (opMode << 6)) * PDP10.OPCODE.OP_SCALE;
                         break;
                     }
                 }
@@ -1601,12 +1601,12 @@ class DebuggerPDP10 extends Debugger {
                     }
                     if (!i && aOperands.length > 1) {
                         if (opMask == PDP10.OPCODE.OPIO) {
-                            if (operand < 0 || operand > PDP10.OPCODE.IOMASK) {
+                            if (operand < 0 || operand > PDP10.OPCODE.IO_MASK) {
                                 this.println("device code out of range: " + match[2]);
                                 opCode = -1;
                                 break;
                             }
-                            opCode += (operand * PDP10.OPCODE.IOSHIFT);
+                            opCode += (operand * PDP10.OPCODE.IO_SCALE);
                         }
                         else {
                             if (operand < 0 || operand > PDP10.OPCODE.A_MASK) {
diff --git a/modules/pdp10/lib/defines.js b/modules/pdp10/lib/defines.js
index cc500eb96..17a9b4030 100644
--- a/modules/pdp10/lib/defines.js
+++ b/modules/pdp10/lib/defines.js
@@ -158,10 +158,14 @@ var PDP10 = {
         OPTEST:     0o71100,            // operation with test
         OPIO:       0o70034,            // input-output operation
         OPUUO:      0o70000,            // unimplemented user operation (UUO) mask
-        OPSHIFT:    Math.pow(2, 21),    // operation shift
-        IOSHIFT:    Math.pow(2, 26),    // input-output device code shift
-        IOMASK:     0o177,              // input-output device code mask (after shift)
-        ACSHIFT:    Math.pow(2, 23),    // used to shift down the high 13 bits, with A starting at bit 0
+        OP_SCALE:   Math.pow(2, 21),    // operation scale
+        IO_SCALE:   Math.pow(2, 26),    // input-output device code scale
+        IO_MASK:    0o177,              // input-output device code mask (after descale)
+        A_SCALE:    Math.pow(2, 23),    // used to shift down the high 13 bits, with A starting at bit 0
+        P_SCALE:    Math.pow(2, 30),    // P scale
+        P_MASK:     0o77,               // P mask (after descale)
+        S_SHIFT:    24,                 // S shift
+        S_MASK:     0o77,               // S mask (after shift)
         A_SHIFT:    23,                 // A shift
         A_MASK:     0o17,               // A mask (after shift)
         I_BIT:      0o20000000,         // indirect bit
@@ -169,6 +173,7 @@ var PDP10 = {
         X_MASK:     0o17,               // X mask (after shift)
         Y_MASK:     0o777777,           // Y mask
         R_MASK:     0o37777777,         // used to isolate the low 23 bits (I,X,Y)
+        PTR_MASK:   0o77777777,         // used to isolate the low 24 bits (?,I,X,Y) of a byte pointer
         HALT:       0o5304              // operation code for HALT
     },
 
diff --git a/versions/pdpjs/1.34.2/pdp10-dbg.js b/versions/pdpjs/1.34.2/pdp10-dbg.js
index 9ff071604..284de8746 100644
--- a/versions/pdpjs/1.34.2/pdp10-dbg.js
+++ b/versions/pdpjs/1.34.2/pdp10-dbg.js
@@ -31,8 +31,8 @@ var l,aa="function"==typeof Object.defineProperties?Object.defineProperty:functi
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 ka("Math.trunc",function(a){return a?a:function(a){a=Number(a);if(isNaN(a)||Infinity===a||-Infinity===a||!a)return a;var b=Math.floor(Math.abs(a));return 0>a?-b:b}});ka("Math.log2",function(a){return a?a:function(a){return Math.log(a)/Math.LN2}});
-var la=Math.pow(2,36),ma=-Math.pow(2,35),q={bc:0,ub:1,dc:2,ec:3,fc:4,gc:5,hc:6,ic:7,bb:8,jc:9,vb:10,kc:11,lc:12,wb:13,mc:14,nc:15,oc:16,pc:17,qc:18,rc:19,sc:20,tc:21,uc:22,vc:23,wc:24,xc:25,yc:26," ":32,"!":33,'"':34,"#":35,$:36,"%":37,"&":38,"'":39,"(":40,")":41,"*":42,"+":43,",":44,"-":45,".":46,"/":47,0:48,1:49,2:50,3:51,4:52,5:53,6:54,7:55,8:56,9:57,":":58,";":59,"<":60,"=":61,">":62,"?":63,"@":64,ab:65,ac:66,cc:67,zc:68,E:69,Ac:70,Bc:71,Cc:72,Dc:73,Ec:74,Fc:75,Gc:76,Hc:77,Ic:78,Jc:79,Kc:80,Q:81,
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+var la=Math.pow(2,36),ma=-Math.pow(2,35),q={dc:0,vb:1,fc:2,gc:3,hc:4,ic:5,jc:6,kc:7,eb:8,lc:9,wb:10,mc:11,nc:12,xb:13,oc:14,pc:15,qc:16,rc:17,sc:18,tc:19,uc:20,vc:21,wc:22,xc:23,yc:24,zc:25,Ac:26," ":32,"!":33,'"':34,"#":35,$:36,"%":37,"&":38,"'":39,"(":40,")":41,"*":42,"+":43,",":44,"-":45,".":46,"/":47,0:48,1:49,2:50,3:51,4:52,5:53,6:54,7:55,8:56,9:57,":":58,";":59,"<":60,"=":61,">":62,"?":63,"@":64,cb:65,cc:66,ec:67,Bc:68,E:69,Cc:70,Dc:71,Ec:72,Fc:73,Gc:74,Hc:75,Ic:76,Jc:77,Kc:78,Lc:79,Mc:80,Q:81,
+Nc:82,Oc:83,Pc:84,Qc:85,Rc:86,Sc:87,Tc:88,Uc:89,zb:90,"[":91,"\\":92,"]":93,"^":94,_:95,"`":96,Vc:97,Wc:98,Xc:99,d:100,e:101,Yc:102,Zc:103,$c:104,ad:105,bd:106,k:107,cd:108,dd:109,n:110,ed:111,p:112,q:113,r:114,fd:115,t:116,hd:117,jd:118,kd:119,x:120,y:121,z:122,"{":123,"|":124,"}":125,"~":126,yb:127};
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