What is the difference between the Intel ODP and ODPR processors?
• ODP stands for OverDrive Processor, and ODPR stands for OverDrive Processor Replacement. The OverDrive Processor is a 169-pin upgrade to an existing processor. It is used in the ‘upgrade socket’ (the 169-pin Socket 1 that resides near the original CPU socket). The ODP has a special pin that disables the on-board processor and takes over control of the computer. If the original socket on the motherboard has 169 pins or greater, then the ODP may replace the original CPU in the same socket. The ODP is a 5v processor that comes in many flavors (SX, SX2, DX, DX2, and DX4) and has a 487SX pinout, the same as the Intel math co-processor. • Pin C-11 on the original 486 processors is the Upgrade Present (UP#) pin. It’s natural state is pulled high (tied to the power plane through a pull-up resistor). When the OverDrive (ODP) or 487SX math co-processor is inserted into the upgrade socket, its upgrade pin (B-14) pulls the original processor’s UP# pin low, forcing the processor into a powered do
