Related:

• big iron n. [common] Large, expensive, ultra-fast computers.
  Used generally of number-crunching supercomputers such as Crays, but can include more conventional big commercial IBMish mainframes....
• iron: n. Hardware, especially older and larger hardware of {mainframe} class with big metal cabinets housing relatively low-density electronics (but the term is also used of modern supercomputers).
  Often in the phrase {big iron}. Oppose {silicon}....
• heavy metal: [Cambridge] n. Syn. {big iron}. -- The AI Hackers Dictionary
• iron n. Hardware, especially older and larger hardware of mainframe class with big metal cabinets housing relatively low-density electronics (but the term is also used of modern supercomputers).
  Often in the phrase big iron. Oppose silicon. See also dinosaur....
• mainframe: n. Term originally referring to the cabinet containing the central processor unit or `main frame' of a room-filling {Stone Age} batch machine.
  After the emergence of smaller `minicomputer' designs in the early 1970s, the traditional {big iron} machines were described as `mainframe computers' and eventually just as mainframes....
• dinosaur: n. 1. Any hardware requiring raised flooring and special power.
  Used especially of old minis and mainframes, in contrast with newer microprocessor-based machines....
• heavy metal n. [Cambridge] Syn. big iron.
• mainframe n. Term originally referring to the cabinet containing the central processor unit or `main frame' of a room-filling Stone Age batch machine.
  After the emergence of smaller `minicomputer' designs in the early 1970s, the traditional big iron machines were described as `mainframe computers' and eventually just as mainframes....
• dusty deck: n. Old software (especially applications) which one is obliged to remain compatible with
  or to maintain ({DP} types call this `legacy code', a term hackers consider smarmy and excessively reverent)....