diff --git a/emulator/vpx-device/vpxlog.cpp b/emulator/vpx-device/vpxlog.cpp
index 12064dd..1bab383 100644
--- a/emulator/vpx-device/vpxlog.cpp
+++ b/emulator/vpx-device/vpxlog.cpp
@@ -33,6 +33,9 @@
 #include "dosbox.h"
 #include "inout.h"
 #include "logging.h"
+#include "mem.h"
+#include "vga.h"
+#include "../ints/int10.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -652,27 +655,40 @@ static void rt_draw(HDC dc, const VFrame &f, int cw, int ch) {
     SwapBuffers(dc);
 }
 
-/* ---- VDB palette windows: one 640x480 window per display palette ---------
- * Each shows a 16x16 grid of the 256 colors, updated live. */
+/* ---- VDB display windows: one 640x480 window per display -----------------
+ * Renders the actual gauge framebuffer (DOSBox's 16bpp M_LIN16 video memory,
+ * the encoded video stream the VDB splits) so each window shows "similar
+ * output" to the DOSBox screen. (Palette-based per-display decode is TBD; for
+ * now all three show the shared framebuffer.) */
 static void pal_draw(HDC dc, int g, int cw, int ch) {
-    glViewport(0, 0, cw, ch);
-    glClearColor(0.09f, 0.09f, 0.11f, 1.0f);
-    glClear(GL_COLOR_BUFFER_BIT);
-    glDisable(GL_DEPTH_TEST);
-    glDisable(GL_TEXTURE_2D);
-    glDisable(GL_LIGHTING);
-    glMatrixMode(GL_PROJECTION); glLoadIdentity();
-    glOrtho(0, 16, 16, 0, -1, 1);            /* 16x16 grid, y-down */
-    glMatrixMode(GL_MODELVIEW); glLoadIdentity();
-    glBegin(GL_QUADS);
-    for (int i = 0; i < 256; i++) {
-        float x = (float)(i % 16), y = (float)(i / 16);
-        const unsigned char *e = &vdb_pal[g].ram[i * 3];
-        glColor3ub(e[0], e[1], e[2]);
-        glVertex2f(x, y);         glVertex2f(x + 1, y);
-        glVertex2f(x + 1, y + 1); glVertex2f(x, y + 1);
+    const int W = 640, H = 480;
+    static unsigned char img[640 * 480 * 3];
+    const uint8_t *fb = vga.mem.linear;
+    Bitu mask = vga.draw.linear_mask ? vga.draw.linear_mask
+                                     : (vga.mem.memsize ? vga.mem.memsize - 1 : 0);
+    Bitu start = vga.config.real_start;      /* visible page start (bytes) */
+    Bitu stride = (Bitu)W * 2;               /* 16bpp */
+    if (fb) {
+        for (int y = 0; y < H; y++) {
+            Bitu ofs = start + (Bitu)y * stride;
+            unsigned char *d = &img[(size_t)y * W * 3];
+            for (int x = 0; x < W; x++, ofs += 2, d += 3) {
+                uint16_t px = *(const uint16_t *)(fb + (ofs & mask));
+                d[0] = (unsigned char)(((px >> 11) & 0x1F) * 255 / 31);
+                d[1] = (unsigned char)(((px >> 5)  & 0x3F) * 255 / 63);
+                d[2] = (unsigned char)(( px        & 0x1F) * 255 / 31);
+            }
+        }
+    } else {
+        memset(img, 0, sizeof img);
     }
-    glEnd();
+    (void)g;
+    glViewport(0, 0, cw, ch);
+    glClearColor(0, 0, 0, 1); glClear(GL_COLOR_BUFFER_BIT);
+    glDisable(GL_DEPTH_TEST); glDisable(GL_TEXTURE_2D); glDisable(GL_LIGHTING);
+    glPixelZoom((float)cw / W, -(float)ch / H);   /* scale + flip y */
+    glRasterPos2f(-1.0f, 1.0f);
+    glDrawPixels(W, H, GL_RGB, GL_UNSIGNED_BYTE, img);
     SwapBuffers(dc);
 }
 
@@ -1201,7 +1217,13 @@ static void vdb_write(Bitu port, Bitu val, Bitu /*iolen*/) {
     io_port_t off = (io_port_t)port - VDB_BASE;
     unsigned char v = (unsigned char)val;
     if (port == 0x319) { vdb_splitter_on = false; vdb_note("splitter clock OFF (0x319)"); return; }
-    if (port == 0x31A) { vdb_splitter_on = true;  vdb_note("splitter clock ON  (0x31A)"); return; }
+    if (port == 0x31A) { vdb_splitter_on = true;  vdb_note("splitter clock ON  (0x31A)");
+        if (vpx_fp && CurMode) { flush_run();
+            fprintf(vpx_fp, "# VDB framebuffer mode: 0x%X type=%d %ux%u pitch=%u\n",
+                    (unsigned)CurMode->mode, (int)CurMode->type,
+                    (unsigned)CurMode->swidth, (unsigned)CurMode->sheight,
+                    (unsigned)CurMode->pitch); fflush(vpx_fp); }
+        return; }
     int g = vdb_group_of(off);
     if (g < 0) return;
     VDBPalette &p = vdb_pal[g];