Added emulation of the Intel 82335 chip for the Phoenix 386 clone;

Added the Samsung SPC-4200P;
Added the Chips & Technologies VGA 451;
Applied all mainline PCem commits;
Added Amstrad MegaPC 386DX model (exits per documentation that I have in German).

src/vid_voodoo.c

@@ -5922,6 +5922,8 @@ static void voodoo_writel(uint32_t addr, uint32_t val, void *p)
                                   happen here on a real Voodoo*/
                                 voodoo->disp_buffer = 0;
                                 voodoo->draw_buffer = 1;
+                                voodoo_recalc(voodoo);
+                                voodoo->front_offset = voodoo->params.front_offset;
                         }
                 }
                 break;