| The microprocessor (µP) used in the original Motronic design
(the ML1.1) is the CDP1802 introduced by RCA in 1976. The RCA 1802 8-bit
microprocessors has a most unique architecture. Its memory chips are incompatible
to any other manufacturers product. In late 1984, BOSCH redesigned the digital board of the
ML1.1/ML1.2 to replace the four RCA ROMs with a single 2732 EPROM. The BOSCH and
the Porsche part numbers did not change since both designs function the same. A
socket was added to the circuit board which makes the EPROM removable. This
design change was made for manufacturing convenience only since both BOSCH and
Porsche are against aftermarket chips. |
