...none of which have EPROMS in them that haven't been back to the shop a time or two. Most were still point-gap ignition systems with no other processor controlled components. Would you care to read an EPROM datasheet from the 1980s? Microprocessors in the 1980-95 time frame did not have FLASH memory simply because it didn't exist. Most were UV erasable EPROMS, even the one-time programmable ones. Would you like to read datasheets regarding microprocessors of that era?
You do know that microcontroller based automobile electronics is a fairly recent technology, don't do?
“...none of which have EPROMS in them that haven’t been back to the shop a time or two. “
Of course they have been back to the shop. Most people don’t do their own oil changers!
“Microprocessors in the 1980-95 time frame did not have FLASH memory simply because it didn’t exist. “
100,000,000 units shipped in 1990.