diff --git a/src/memory.d b/src/memory.d
index 33e911f..5aa3a57 100644
--- a/src/memory.d
+++ b/src/memory.d
@@ -253,14 +253,15 @@ class AddressDecoder
         writePages[0xC0] = &switches.write;
     }
 
-    ubyte read(ushort addr)
+    ubyte opIndex(ushort addr)
     {
         return readPages[addr >> 8](addr);
     }
 
-    void write(ushort addr, ubyte val)
+    ubyte opIndexAssign(ubyte val, ushort addr)
     {
         writePages[addr >> 8](addr, val);
+        return val;
     }
 
     // XXX address read only/write only code
diff --git a/src/video/scanner.d b/src/video/scanner.d
index 13243a4..f936bde 100644
--- a/src/video/scanner.d
+++ b/src/video/scanner.d
@@ -256,8 +256,8 @@ class Scanner_II : Scanner
     {
         uint clock = vidCycle.val();
         if (((clock % 65) < 25) && (mode != Mode.HIRES))
-            return decoder.read(
-              cast(ushort)(0x1400 + (page * 0x400) + scanOffset(clock, mode)));
+            return decoder[
+              cast(ushort)(0x1400 + (page * 0x400) + scanOffset(clock, mode))];
         else
             return displayMem[mode][page].data[scanOffset(clock, mode)];
     }