heh..
you have unearthed something from the dimmest past..
you asked, so.....
nope.. i finally had a 1985 (i think) lagonda with 12k miles on it..
swapped the archaic computer for some modern aftermarket instruments.. digital of course.. then got old and tired of messing with cars in general and sold that lagonda for much cash..
i still have some misc. parts from the crashed car i owned and sold to a fellow in canada for less mucho cash but at least what i had in it plus the parts i used and kept..
what was your question again..?

Z80..? the people who made that computer for aston martin were in texas and did not want to see onw of their creations ever again..
i sent one in for repairs and got it back shipping collect with a terse note to never send it back to them..
their bad custom product nearly destroyed aston martin at that time but in those days (the late 1970's) micro computers were no where near what they were a few years later..
so the Z80 was hot stuff when they used it..
zilog was hot stuff too..
so was gavilan computers.. a spinoff of some zilog guys.. google is your friend..
i guess i can't fault that texas company but they should have owned up to their creation and at least fixed the d@mn thing..
edit:
ok, so i looked at the list of worst cars of all time and it is amazing how many on=f them i drove or owned or were owned by family members..
the AMC pacer was a nice bubble car.. lots of glass.. wife #2 had one.. delorean, i test drove one when they were new and hot at a dealer in san mateo.. the lagonda you know about.. wife #3 (current wife of 31 years!) had a fiero with that iron duke engine.. GM replaced it and thereafter it burned itself up.. sister had an XKE jag V12 which i drove a few times, once across the richmond/san rafael bridge at 130 mph (3am, no traffic), nice car, she gave it to her son who promptly sold it to a man in new york for $$ to buy some crummy boat.. the MG twin cam..! i had a new one in 1959.. it had a recall for engine issues.. when i bought it from british cars of burlingame i traded in my 1948 jag mark IV salon.. (again, google is your friend).. the edsel was just a mercury with a different front end and buttons in place of shift lever.. the chrysler imperial thing i drove when i had to fly to LA for business and rented it.. big sloppy car.. at that time i owned a '66 XKE and that imperial did NOT handle like the jag..

so, there you have some ruminations if yo got this far in reading..
