Applied a typo-fixing mainline PCem commit to 808x.c;

Temporarily reverted serial port and serial mouse code back to the old one until the new code is fixed;
Fixed nvr_path handling - the NVR path no longer gets messed up at hard reset.

src/disc_86f.c

@@ -3328,5 +3328,4 @@ void d86f_close(int drive)
                 fclose(d86f[drive].f);
 	if (d86f[drive].is_compressed)
                 _wremove(temp_file_name);
-        d86f[drive].f = NULL;
 }