The FIFO input-character buffer in an EIA-232 serial line card. So called from DEC terminology used on DH and DZ line cards for the VAX and PDP-11, presumably because it was a storage space for fungible stuff that went in at the top and came out at the bottom.

In addition suitable contents:
[ 2 ] [ = ] [ ag ] [ al ] [ am ] [ an ] [ ar ] [ arc ] [ as ] [ at ] [ au ] [ b ] [ be ] [ bo ] [ bot ] [ bottom ] [ buffer ] [ C ] [ ca ] [ card ] [ ch ] [ char ] [ character ] [ D ] [ DEC ] [ DP ] [ du ] [ E ] [ ec ] [ ed ] [ EIA ] [ EIA-232 ] [ er ] [ es ] [ fi ] [ FIFO ] [ file ] [ fo ] [ for ] [ fr ] [ ge ] [ gi ] [ gy ] [ h ] [ hat ] [ hr ] [ IA ] [ id ] [ il ] [ in ] [ input ] [ it ] [ Lex ] [ li ] [ line ] [ ly ] [ ma ] [ mo ] [ mod ] [ module ] [ na ] [ ne ] [ ng ] [ no ] [ np ] [ O ] [ om ] [ op ] [ pa ] [ PD ] [ PDP ] [ PDP-11 ] [ ph ] [ pr ] [ query ] [ rc ] [ re ] [ ro ] [ S ] [ se ] [ serial line ] [ space ] [ st ] [ storage ] [ su ] [ sum ] [ T ] [ th ] [ to ] [ tt ] [ um ] [ us ] [ V ] [ VAX ] [ X ] [ Z ]