wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/basic-2-c000.901465-01.bin
wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/basic-2-d000.901465-02.bin
wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/edit-2-n.901447-24.bin
wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/kernal-2.901465-03.bin
awk 'BEGIN {while(i<2048){printf( "\0");i++;}}' >nullfill.bin
cat basic-2-c000.901465-01.bin basic-2-d000.901465-02.bin edit-2-n.901447-24.bin nullfill.bin kernal-2.901465-03.bin >pet.rom