Other IT parts from the last century or simply belonging in a museum:

Or how today's AI would put it:

• "Legacy IT components": This is the standard industry term for older technology that is still in use but has been superseded by newer versions.
• "Outdated infrastructure elements": Highlights that these parts are no longer current or efficient.
• "Vintage computing hardware": Suggests the items have historical or collector value rather than just being "old."
• "Obsolete IT assets": Indicates that the parts are no longer useful or supported by modern standards. 

• "Hardware remnants from the late 20th century": A precise way to date the items without using the word "century" directly.
• "Technological artifacts of a prior era": Adds a touch of sophistication, often used in historical or academic writing.
• "IT systems predating the current millennium": A formal way to describe items from before the year 2000. 

• "Pre-millennial IT gear": Short and clear for modern readers.
• "Not so latest-gen components": Specifically implies they belong to the generation of technology immediately preceding the current one.
• "Retro IT hardware": A more casual or stylistic choice often used in hobbyist communities.