This program make_sram.py creates .sav files for all iNES format ROMs in a folder and its subfolders that have the battery bit turned on. It's useful for users of PowerPak, which can't create files by itself. It is written in Python and has been tested on Python 2.6 on Ubuntu Karmic and (to a lesser extent) Python 2.5 on Windows. If you have trouble getting to run under your copy of Python, tell me about it here or on the forum.
#!/usr/bin/env python """ make_sram See versionText below for copyright information. Change log: 0.02 (2009-12-30): fixed a 'with' statement that I missed 0.01 (2009-12-29): initial release """ import os # I'd use python 2.5's with statement, but the last time I posted a # python program on pocket heaven, people were complaining about not # being able to run my program on python 2.4. helpText = """Usage: make_sram [foldername] Makes empty 8192 byte .sav files for .nes files that need it. """ versionText = """make_sram 0.02 (2009-12-30) Copyright 2009 Damian Yerrick Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved. This file is offered as-is, without any warranty. """ def findAllRoms(folder='.'): pathnames =  for (root, folders, files) in os.walk(folder): for filename in files: if filename.lower().endswith('.nes'): pathnames.append(os.path.join(root, filename)) return pathnames def getINESBatteryBit(filename): infp = None try: infp = open(filename, 'rb') infp.seek(6) c = ord(infp.read(1)) return (c & 0x02) != 0 finally: if infp is not None: infp.close() def getSavName(filename): (folder, filename) = os.path.split(filename) (filename, ext) = os.path.splitext(filename) return os.path.join(folder, filename + '.sav') def processFolder(folder='.', dry=False): # First find the corresponding .sav filename for each .nes rom # with a battery bit savFiles = [getSavName(filename) for filename in findAllRoms(folder) if getINESBatteryBit(filename)] # Then find the ones that don exits (like tires) savFiles = [filename for filename in savFiles if not os.path.exists(filename)] blankSavData = chr(0) * 8192 for filename in savFiles: print filename if not dry: r = open(filename, 'wb') r.write(blankSavData) r.close() def main(argv=None): if argv is None: import sys argv = sys.argv if len(argv) > 1: folderName = argv if folderName in ('--help', '-?', '/?', '-h'): print helpText return elif folderName == '--version': print versionText return else: folderName = '.' processFolder(folderName) if __name__=='__main__': main()