diff -BurN qemu-0.8.2.orig/hw/pc.c qemu-0.8.2/hw/pc.c
--- qemu-0.8.2.orig/hw/pc.c	2006-09-12 23:33:03.000000000 +0000
+++ qemu-0.8.2/hw/pc.c	2006-09-12 23:35:47.000000000 +0000
@@ -646,13 +646,13 @@
 
     /* BIOS load */
     bios_offset = ram_size + vga_ram_size;
-    vga_bios_offset = bios_offset + 256 * 1024;
+    vga_bios_offset = bios_offset + 2048 * 1024;
 
     snprintf(buf, sizeof(buf), "%s/%s", bios_dir, BIOS_FILENAME);
     bios_size = get_image_size(buf);
     if (bios_size <= 0 || 
         (bios_size % 65536) != 0 ||
-        bios_size > (256 * 1024)) {
+        bios_size > (2048 * 1024)) {
         goto bios_error;
     }
     ret = load_image(buf, phys_ram_base + bios_offset);
@@ -677,15 +677,17 @@
     cpu_register_physical_memory(0xc0000, 0x10000, 
                                  vga_bios_offset | IO_MEM_ROM);
 
-    /* map the last 128KB of the BIOS in ISA space */
-    isa_bios_size = bios_size;
-    if (isa_bios_size > (128 * 1024))
-        isa_bios_size = 128 * 1024;
-    cpu_register_physical_memory(0xd0000, (192 * 1024) - isa_bios_size, 
-                                 IO_MEM_UNASSIGNED);
-    cpu_register_physical_memory(0x100000 - isa_bios_size, 
-                                 isa_bios_size, 
-                                 (bios_offset + bios_size - isa_bios_size) | IO_MEM_ROM);
+    if (bios_size == 65536) {
+        /* map the last 128KB of the BIOS in ISA space */
+        isa_bios_size = bios_size;
+        if (isa_bios_size > (128 * 1024))
+            isa_bios_size = 128 * 1024;
+        cpu_register_physical_memory(0xd0000, (192 * 1024) - isa_bios_size, 
+                                     IO_MEM_UNASSIGNED);
+        cpu_register_physical_memory(0x100000 - isa_bios_size, 
+                                     isa_bios_size, 
+                                     (bios_offset + bios_size - isa_bios_size) | IO_MEM_ROM);
+    }
     /* map all the bios at the top of memory */
     cpu_register_physical_memory((uint32_t)(-bios_size), 
                                  bios_size, bios_offset | IO_MEM_ROM);
diff -BurN qemu-0.8.2.orig/vl.h qemu-0.8.2/vl.h
--- qemu-0.8.2.orig/vl.h	2006-09-12 23:33:03.000000000 +0000
+++ qemu-0.8.2/vl.h	2006-09-12 23:34:32.000000000 +0000
@@ -160,7 +160,7 @@
 #elif defined(TARGET_MIPS)
 #define BIOS_SIZE (128 * 1024)
 #else
-#define BIOS_SIZE ((256 + 64) * 1024)
+#define BIOS_SIZE ((2048 + 64) * 1024)
 #endif
 
 /* keyboard/mouse support */