dwt: real-unit MOP console works; SHOW reports Monitor Type VR319; TEST refused with DWT IN USE while a window is open

dwt/evidence/real-unit-mop-show.txt

@@ -0,0 +1,4 @@
+    00b0  2d 2d 0d 0a 20 20 20 46  69 72 6d 77 61 72 65 20  --..   Firmware 
+    0180  20 53 49 4d 4d 20 33 20  69 6e 73 74 61 6c 6c 65   SIMM 3 installe
+    01c0  44 69 73 70 6c 61 79 20  54 79 70 65 20 20 20 20  Display Type    
+    text: SHOW....   DECwindows Terminal System Configuration....   Configuration Parameter   Parameter Value..   --------------------------------------------------------..   Firmware Revision         V2.2..   Option Memory             Present..                                SIMM 1 installed..                                SIMM 2 installed..                                SIMM 3 installed..   Image Option              Not Present..   Display Type              Monochrome..   Monitor Type              VR319....DWT>>> 

dwt/notes/REAL_UNIT.md

@@ -187,3 +187,30 @@ window over the Terminal Manager, on the real screen.
 **Caveat:** the loader and app are linked at fixed addresses (`0x01880000`,
 `0x01840000`). Re-running while that app is live overwrites the running code.
 Power-cycle (or choose new addresses) before loading again.
+
+### MOP console on the real unit
+
+`dwt/mop_console.py --iface enp197s0f3u1 --mac 08:00:2b:16:4b:5a` works with no
+password. `SHOW` returned:
+
+```
+Firmware Revision  V2.2
+Option Memory      Present (SIMM 1/2/3 installed)
+Image Option       Not Present
+Display Type       Monochrome
+Monitor Type       VR319
+```
+
+**Monitor Type VR319** is the answer to the geometry question: the unit is in
+the VR319 (19", 100 dpi) mode, not the emulator's forced VR150. That is why the
+real framebuffer is 1280x1024 with the 256-byte stride.
+
+`TEST 9 9 8` (Ethernet port test, LANCE loopback bit 3) was refused:
+
+```
+?ILLEGAL COMMAND - DWT IN USE
+```
+
+The console refuses diagnostics while the DWT has active work — our injected
+xhello window is the blocker. The service guide requires no open windows before
+remote tests: power-cycle (or close all session windows) and retry.