Port fix from bochs-bios for incorrect acpi on boxes < 16M.
diff --git a/src/system.c b/src/system.c
index 51028f9..7f18487 100644
--- a/src/system.c
+++ b/src/system.c
@@ -328,7 +328,7 @@
         extended_memory_size = inb_cmos(CMOS_MEM_EXTMEM_HIGH);
         extended_memory_size <<= 8;
         extended_memory_size |= inb_cmos(CMOS_MEM_EXTMEM_LOW);
-        extended_memory_size *= 1024;
+        extended_memory_size += 1 * 1024 * 1024;
     }
 
     switch (regs->bx) {