Amiga ADF Generator

Python script to generate an ADF file for transfer to an Amiga, given some assembled binary code. See this post for more details.

A much improved version is discussed in this post and can be found in the git repository.

import struct
import sys

bootfile="boot.bin"
outfile="test.adf"

#Read our bootblock data...
print "Reading "+bootfile
f=open(bootfile,'rb')
bootblock=f.read()
f.close()

#Make sure it will fit...
if len(bootblock)>1024:
  print("The bootblock is too large")
  sys.exit(1)

#Pad the loaded bootblock data out to the correct length, i.e. 1024 bytes,
#which is 2 sectors...
while(len(bootblock)<1024):
  bootblock+="\0"

#Calculate checksum of bootblock
checksum=0
for i in range(1024/4):
  thislong=ord(bootblock[i*4])<<24
  thislong+=ord(bootblock[i*4+1])<<16
  thislong+=ord(bootblock[i*4+2])<<8
  thislong+=ord(bootblock[i*4+3])
  checksum+=thislong
  if checksum>0xFFFFFFFF:
    checksum-=0x100000000
    checksum+=1
checksum^=0xFFFFFFFF
bootblock=bootblock[:4]+struct.pack('>L',checksum)+bootblock[8:]

#Write the ADF file, which is basically the entire disk's worth of data
#arranged sector by track for a total length of 901120 bytes...
of=open(outfile,'wb')
of.write(bootblock)

#Pad any unused disk space with 0's...
restofdisk=901120-len(bootblock)
for i in range(restofdisk):
  of.write('\0')
of.close()
print "Generated "+outfile