the daughterboard before 1985 ?

I assume you mean the COMPUTER daughter boards and not the college ones, LOL.

Daughter boards for what board, or device are you referring to. All a daughter board did was to give you an easy way to add and / or make optional hardware changes. One range of mainframe printers, that a company i worked for sold, had a range of daughter boards for their printers. the driver board you bought for the computer varied with whatever mainframe or mini-computer hardware you had, change the computer it was attached to and all you had to do was to buy a different daughter board for the driver board, ditto with the connection daughter board. Some hardware you could upgrade the available memory or fonts etc by buying add-on daughter boards.

This concept went out of style with the improvements in micro chips and eproms, much of what the daughter boards did in the early 1980's was done by changing eproms in the mid 1980's and that was much easier. Now days you would buy a replcement chip with the program or just do a 'flash' update to the embedded software chip.