Reusing old circuit boar components

hello,

i came across a few old circuit board , has ton of motherboard , processing chips. wondering if can still used else, or have reprogrammed? have basic knowledge of electronic components.

so questions is:

what can reprogrammed or re-used off of old circuit board.
what can't reprogrammed?

thanks!

do have recognizable part numbers? if not, parts aren't anything.
write down can see - of markings manufacturer, date code, , part  number.

some parts not programmable (logic , buffer chips, sram/dram type memory), might one-time programmable (eprom), , might run program stored on chip (microprocessors).

without part numbers tho, not more can said.

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