Your 6 zone is around 18 year old now so it ain't done so bad,
sorry to hear you didn't get it going though :(
If you are looking for a replacement then I recommend the scantronic 9448 with onboard keypad,nothing fancy about this little 7 zone,but it's cheap and reliable.
Only downside is it's not very end user friendly from a programming point of view,albeit you did manage to understand your zx6 manual,so in theory you should'nt have any issues.
e manno, October 2012