HALT fix, QoL tweaks

app/App.js

@@ -121,7 +121,7 @@ globalThis.App = class App {
     // ROM buffer has been configured
     setROM(msg) {
         let dbg = this.debuggers[msg.sim];
-        dbg.refresh();
+        dbg.refresh(true);
     }
 
 

app/Debugger.js

@@ -46,8 +46,8 @@ globalThis.Debugger = class Debugger {
     }
 
     // Reload all output
-    refresh() {
-        this.cpu   .refresh();
+    refresh(seekToPC) {
+        this.cpu   .refresh(seekToPC);
         this.memory.refresh();
     }
 

app/windows/CPUWindow.js

@@ -234,7 +234,7 @@
             case "ReadBuffer"  : this.readBuffer  (msg); break;
             case "SetRegister" : this.setRegister (msg); break;
             case "RunNext": case "SingleStep":
-                this.refresh(true); break;
+                this.debug.refresh(true); break;
         }
     }
 

app/windows/Disassembler.js

@@ -345,8 +345,10 @@
         let reg2 = this.PROREGNAMES[bits >> 21 & 31];
         let reg1 = this.PROREGNAMES[bits >> 16 & 31];
         let disp = this.signExtend(bits & 0xFFFF, 16);
-        disp = disp == 0 ? "" : (disp < 0 ? "-" : "") + "0x" +
-            Math.abs(disp).toString(16).toUpperCase();
+        disp = disp == 0 ? "" : (disp < -255 || disp > 255) ? "0x" +
+            ("000" + (disp & 0xFFFF).toString(16).toUpperCase()).slice(-4) :
+            (disp < 0 ? "-" : "") + "0x" +
+                Math.abs(disp).toString(16).toUpperCase();
         switch (inst.opcode) {
             case 0b110000: // LD.B
             case 0b110001: // LD.H

app/windows/MemoryWindow.js

@@ -99,8 +99,8 @@ globalThis.MemoryWindow = class MemoryWindow extends Toolkit.Window {
     // Message received
     message(msg) {
         switch (msg.command) {
-            case "ReadBuffer": this.readBuffer(msg); break;
-            case "Write"     : this.debug.refresh(); break;
+            case "ReadBuffer": this.readBuffer(msg)     ; break;
+            case "Write"     : this.debug.refresh(false); break;
         }
     }
 
@@ -380,6 +380,7 @@ MemoryWindow.Row = class Row extends Toolkit.Panel {
 
         // Configure element
         this.element.setAttribute("role", "row");
+        this.element.addEventListener("pointerdown", e=>this.onpointerdown(e));
 
         // Address label
         this.addr = this.add(parent.newLabel({ text: "\u00a0" }));
@@ -418,6 +419,31 @@ MemoryWindow.Row = class Row extends Toolkit.Panel {
         return (this.wnd.address + this.offset & 0xFFFFFFFF) >>> 0;
     }
 
+    // Pointer down event handler
+    onpointerdown(e) {
+
+        // Error checking
+        if (e.button != 0)
+            return;
+
+        // Check whether the click is within the columns of cells
+        let next = this.cells[0].getBounds();
+        if (e.x < next.left)
+            return;
+
+        // Compute which cell was clicked
+        for (let x = 0; x < 16; x++) {
+            let cur = next;
+            if (x < 15) {
+                next = this.cells[x + 1].getBounds();
+                if (e.x < (cur.right + next.left) / 2)
+                    return this.wnd.setSelected(this.cells[x].address());
+            } else if (e.x < cur.right)
+                return this.wnd.setSelected(this.cells[x].address());
+        }
+
+    }
+
 };
 
 // One cell of output
@@ -435,7 +461,6 @@ MemoryWindow.Cell = class Cell extends Toolkit.Label {
         // Configure element
         this.element.setAttribute("role", "gridcell");
         this.element.setAttribute("name", "byte");
-        this.element.addEventListener("pointerdown", e=>this.onpointerdown(e));
 
         parent.add(this);
     }
@@ -473,10 +498,4 @@ MemoryWindow.Cell = class Cell extends Toolkit.Label {
         return (this.wnd.address + this.offset & 0xFFFFFFFF) >>> 0;
     }
 
-    // Pointer down event handler
-    onpointerdown(e) {
-        if (e.button == 0)
-            this.wnd.setSelected(this.address());
-    }
-
 };