I give up for now. EGA chained 640x350 4-color requires more work tha…

…n I thought. Time to stop before I ruin any VGA emulation code

src/hardware/vga.cpp

@@ -719,6 +719,13 @@ void VGA_Reset(Section*) {
             E_Exit("Unexpected machine");
     };
 
+    /* I'm sorry, emulating 640x350 4-color chained EGA graphics is
+     * harder than I thought and would require revision of quite a
+     * bit of VGA planar emulation to update only bitplane 0 and 2
+     * in such a manner. --J.C. */
+    if (IS_EGA_ARCH && vga.mem.memsize < _KB_bytes(128))
+        LOG_MSG("WARNING: EGA 64KB emulation is very experimental and not well supported");
+
     if (!IS_PC98_ARCH)
         SVGA_Setup_Driver();        // svga video memory size is set here, possibly over-riding the user's selection