Added the DAKAG PDP-10 diagnostics, implemented PUSHJ and POPJ instructions, and improved the debugging of XCT sequences

modules/pdp10/lib/cpustate.js

@@ -500,6 +500,19 @@ class CPUStatePDP10 extends CPUPDP10 {
         return this.regPC;
     }
 
+    /**
+     * getXC()
+     *
+     * NOTE: This function is nothing more than a convenience, and we fully expect it to be inlined at runtime.
+     *
+     * @this {CPUStatePDP10}
+     * @return {number}
+     */
+    getXC()
+    {
+        return this.regXC >= 0? this.regXC : this.regPC;
+    }
+
     /**
      * getLastAddr()
      *
@@ -534,6 +547,7 @@ class CPUStatePDP10 extends CPUPDP10 {
     setPC(addr)
     {
         this.regPC = addr % PDP10.ADDR_LIMIT;
+        this.regXC = -1;
     }
 
     /**