A kind of EIA-232 line tester or breakout box featuring rows of blinking red and green LEDs suggestive of Christmas lights. [Jargon File]

In addition suitable contents:
[ 2 ] [ = ] [ am ] [ an ] [ ar ] [ arc ] [ arg ] [ as ] [ at ] [ b ] [ bo ] [ box ] [ br ] [ break ] [ C ] [ Ch ] [ ch ] [ D ] [ du ] [ E ] [ ed ] [ ee ] [ EIA ] [ EIA-232 ] [ er ] [ es ] [ fi ] [ file ] [ ge ] [ gh ] [ gr ] [ h ] [ hr ] [ ht ] [ IA ] [ id ] [ il ] [ in ] [ is ] [ J ] [ Jargon File ] [ ki ] [ LED ] [ Lex ] [ li ] [ line ] [ link ] [ ma ] [ mo ] [ mod ] [ module ] [ na ] [ ne ] [ ng ] [ ph ] [ query ] [ rc ] [ re ] [ ro ] [ row ] [ se ] [ st ] [ su ] [ test ] [ tm ] [ ug ] [ ve ] [ ws ]