The 5170 AT hard disk controller is limping along now, so I'm getting ready for a 1.15.4 release

Some other interesting bugs were fixed along the way:
the Video component incorrectly assumed that masking a negative number with 0x80000000 would yield 0x80000000 (it actually yields -0x80000000, thank you JavaScript);
the ChipSet component provides a new addCMOSMemory() interface that RAM objects can use to bump the CMOS total to match the actual total;
the CPU properly implements INSW and OUTSW instructions now (kind of important for the AT hard disk controller)

my_modules/pcjs-client/lib/cpu.js

@@ -262,9 +262,7 @@ CPU.prototype.powerUp = function(data, fRepower)
         }
     }
     this.fPowered = true;
-    if (!this.autoStart() && this.dbg) {
-        this.dbg.updateStatus();
-    }
+    if (!this.autoStart() && this.dbg) this.dbg.updateStatus();
     this.updateCPU();
     return true;
 };