fix saves

src/processor/memory/rom.rs

@@ -1,7 +1,7 @@
 use crate::processor::memory::Address;
 use std::{
     fs::{File, OpenOptions},
-    io::{Read, Write},
+    io::{Read, Seek, SeekFrom, Write},
     path::PathBuf,
     str::from_utf8_unchecked,
 };
@@ -36,11 +36,13 @@ impl MaybeBufferedSram {
                     .create_new(true)
                     .open(path)
                     .unwrap();
+                writer.set_len(length as u64).unwrap();
                 Some(writer)
             }
         } else {
             None
         };
+
         Self {
             buf,
             inner,
@@ -66,6 +68,7 @@ impl MaybeBufferedSram {
 
     fn flush(&mut self) {
         if let Some(ref mut writer) = self.inner {
+            writer.seek(SeekFrom::Start(0)).unwrap();
             writer.write_all(&self.buf).unwrap();
         }
     }