for normal (background) code. Page 1 was for interrupt code. Page 2 was also for background, but could only be accessed by a special "Jump Page" instruction from page 0. Page 3 was used to store parametric ("calibration") data or additional interrupt level code. This chip was never sold commercially. Like EEC-I and -II, all code was written in assembly language. The processor chips were manufactured by Motorola, and the modules were designed and assembled by Motorola, Toshiba, or Ford. The designs were functionally equivalent but slightly different components were used. Motorola optimized their design to use as many of their own components as possible. EEC-IV These EEC-IV were used on the Ford/Cosworth 1.5L turbo Formula 1 engine in 1985. EEC-V Additional performance needs drove Ford Electronics to develop an enhanced microprocessor named the 8065 building on EEC-IV technology. Memory was expanded from 64K to 1 megabyte, speed tripled, and I/O more than doubled. Additional interrupts and improved time controlled I/O allowed continued use of EEC-IV code and extended the family lifetime to almost 20 years in production. EEC-V DPC European Ford Diesel Duratorq engines (all TDDi and TDCi starting with model year 2000) used EEC-V DPC-xxx series, which used variant of Intel i196 microcontroller with 28F200 flash memory. The EEC-V DPC ECUs were later replaced by Delphi, Bosch EDC16, Siemens SID80x/SID20x, or Visteon DCU ECUs. Visteon Levanta Visteon Levanta 'Black Oak' PCM is the first ECU that used Freescale PowerPC architecture. The ECU was used in Ford Mondeo, Galaxy, Focus and Ka - 1.8/2.0/2.5/3.0 Duratec HE/I4 engine. EEC-150 EEC-150 for 3.0/4.0 V6/4.6 SOHC engines uses PowerPC, however compared to Visteon Levanta the ECU is closer to EEC-VI by design. EEC-VI EEC-VI is a PowerPC microcontroller used by Ford Motor Company up to 2013 models. Wide ranges of ECU variants exist. EEC-VI use ISO15765 or ISO14229 (UDS) over ISO15765 protocol for diagnostics. EEC-VII and beyond EEC-VII Is the latest system with a PowerPC microcontroller used by Ford Motor Company, utilizing mostly the CAN bus and Ford's proprietary MS-CAN architecture. Other variations currently exist, but no additional information about them is available at this time. References Ford Motor Company Assembly language software Engine technology Automotive technology tradenames