Comment Re:Regulation Strikes again (Score 2) 194
"1980: General Motors implements a proprietary interface and protocol for testing of the Engine Control Module (ECM) on the vehicle assembly line. The 'assembly line diagnostic link' (ALDL) protocol communicates at 160 bit/s Implemented on California vehicles for the 1980 model year, and the rest of the United States in 1981. The only available function for the owner is "Blinky Codes" that transmit the Diagnostic Trouble Code (DTC) with the blinking pattern of the "Check Engine" (MIL) light."