Split an Amiga ROM file into even/odd words

amiromsplit.py

#!/usr/bin/env python

import os
import sys
import re

REGEXP = "AMIGA"
BUFSIZE = 4096
ODD_SUFFIX = "_odd_hi_uXa"
EVEN_SUFFIX = "_even_low_uXb"

if len (sys.argv) != 2:
	print "Usage: %s <romfile>" % sys.argv[0]
	sys.exit (1)

fn_in = sys.argv[1]
split = os.path.splitext (fn_in)
fn_odd = split[0] + ODD_SUFFIX + split[1]
fn_even = split[0] + EVEN_SUFFIX + split[1]

print ("Writing to %s and %s..." % (fn_odd, fn_even))

warningIssued = False
with open (fn_in) as fin, open (fn_odd, "w") as fodd, open (fn_even, "w") as feven:
	while True:
		buf = fin.read (BUFSIZE)
		if not buf:
			break
		if not warningIssued and re.search (REGEXP, buf, re.IGNORECASE):
			print ("WARNING: ROM does not look byteswapped, be careful!")
			warningIssued = True
		pairs = zip (buf[::2], buf[1::2])
		odd = pairs[0::2]
		even = pairs[1::2]
		for pair in odd:
			fodd.write (bytearray (pair))
		for pair in even:
			feven.write (bytearray (pair))

This was written for Python 2, try running it through the 2to3 tool.

Change w to wb and add rb in the other call for binary mode.

Thanks! I'll try in a bit. I used a tool written in C on OSX for now. It also does CRC checksums of a lot of the ROMs provided, so it'll ensure that it's not a wrong one. Pretty cool stuff.

Yeah, this was a quiiiick'n'dirty hack I wrote maaaany years ago (5+), I'm sure there's better stuff around but I could not find anything at the time.