Making an OktaPussy ROM for Amiga

oktapussy.sh

#!/bin/bash
# Download and decompress the prerequisite files and put them in the directory with this script:
# 
# 1. "OKT612.ROM"
# "Oktagon 2008 SCSI Controller 6.12 ROM  27256"
# http://kickstart.ddns.net/Hardware-Software%20Amiga/Hardware/Rom%20Archive/romwebby/okt612.rar
# 
# 2. "at" (OktaPussy/Expansion/at):
# http://aminet.net/disk/misc/oktapus.lha
#
# NOTES: 
# - Mac users will need to download GNU utils, as Apple derps the `dd` and `tr` utilities
# - Resulting file md5sum should be 3c69d380a2789eaa0ec3c63fcafd0908
#
# SOURCES:
# - http://eab.abime.net/showthread.php?t=89260
# - https://www.forum64.de/index.php?thread/81035-oktapussy-eprom-inhalt/
# - https://web.archive.org/web/20111015082148id_/http://www.gb97816.homepage.t-online.de/eprom_atbus.htm
#
# MAC HACK: If using brew gnu coreutils on Mac uncomment the next three lines
#shopt -s expand_aliases
#alias dd=gdd
#alias tr=gtr


# Extract 0x0 to 0x1000 from the original 6.12 ROM
dd bs=1c count=4096 if=OKT612.ROM > oktapussy.bin
# Extract 0x120 - 0x54E4 from the "AT device" file
dd bs=1c skip=288 count=21732 if=at >> oktapussy.bin
# Pad the file with FF to 32KB
dd bs=1c if=/dev/zero count=6940 | tr "\00" "\377" >> oktapussy.bin