--- a/tools/lib64fmts.c	Sun Nov 19 20:02:03 2023 +0200
+++ b/tools/lib64fmts.c	Sun Nov 19 19:39:52 2023 +0200
@@ -2203,6 +2203,23 @@
 }
 
 
+static int fmtGetPixelEXON_VHI(DMC64ScanLine *scan,
+    const DMC64Image *img, const int rasterX, const int rasterY)
+{
+    const int
+        x = rasterX / 16,
+        y = rasterY / 8,
+        yb = rasterY & 7,
+        yoffs = y * img->fmt->chWidth,
+        bmoffs = yoffs * 8 + yb + (x * 8),
+        scroffs = yoffs + x,
+        vshift = 7 - ((rasterX / 2) & 7),
+        vbitmap = rasterX & 1;
+
+    return dmC64GetGenericSCPixel(scan->col, img, bmoffs, scroffs, vshift, 0, vbitmap);
+}
+
+
 //
 // Helper macros for defining screen memory layouts
 // common for several FLI type image formats
@@ -2430,6 +2447,24 @@
             { DO_LAST       , 0              , 0     , 0  , 0     ,   0, NULL, NULL, DF_NORMAL },
         }
     },
+
+    { // #12: EXON VHI Editor 0.1
+        D64_FMT_HIRES | D64_FMT_ILACE,
+        D64_SCR_WIDTH * 2, D64_SCR_HEIGHT,
+        D64_SCR_CH_WIDTH, D64_SCR_CH_HEIGHT,
+        1, 1,
+        NULL, NULL,
+        fmtGetPixelEXON_VHI,
+        {
+            { DO_COPY       , DS_BITMAP_RAM  , 0x2000 - 0x2000, 0,  0,   0, NULL, NULL, DF_NORMAL },
+            { DO_COPY       , DS_BITMAP_RAM  , 0x4000 - 0x2000, 1,  0,   0, NULL, NULL, DF_NORMAL },
+            { DO_COPY       , DS_SCREEN_RAM  , 0x6000 - 0x2000, 0,  0,   0, NULL, NULL, DF_NORMAL },
+            { DO_SET_MEM_LO , DS_D020        , 0x63ea - 0x2000, 0,  0,   0, NULL, NULL, DF_NORMAL },
+
+            { DO_SET_OP     , DS_EXTRA_INFO  , D64_ILACE_RES  , 0,  0,   D64_EI_ILACE_TYPE, NULL, NULL, DF_DECODE },
+            { DO_LAST       , 0              , 0              , 0,  0,   0, NULL, NULL, DF_NORMAL },
+        }
+    }
 };
 
 
@@ -3477,6 +3512,13 @@
         NULL
     },
 
+    {
+        "vhi", "EXON VHI Editor 0.1 (unpacked)", 0x2000, 17389, 0, DM_FMT_RD,
+        NULL,
+        NULL, NULL,
+        { 0 }, &dmC64CommonFormats[12]
+    },
+
 };
 
 const int ndmC64ImageFormats = sizeof(dmC64ImageFormats) / sizeof(dmC64ImageFormats[0]);