American Megatrends Enterprise-IV User Manual page 26

Step 4 Install Upgrade Processor,
Installing an Upgrade Processor
The following discussion applies only to 169-pin processors, such as the 486DX, 486DX2, 486DX3,
486SX, 80487SX, P23T, or P24. Upgrade Processor installation is easy because a ZIF (zero insertion force)
socket is used.
Enterprise-IV EISA VLB Motherboard User's Guide
Continued
Step
1 Lift the lever on the ZIF socket. The empty Upgrade Processor socket
looks like this.
2 Pin 1 of the socket has a white diagonal line across one corner on the
motherboard, which corresponds to pin 1 of the Upgrade Processor.
Check for bent pins on the Upgrade Processor chip. Gently straighten any
bent pins with pliers. Place the Upgrade Processor squarely in the middle
of the socket, making sure that one row of socket pins shows on all four
sides. Make sure that pin 1 of the Upgrade Processor is aligned with pin 1
of the socket.
3 The Upgrade Processor socket is a 240-pin socket. But the 486DX,
486DX2, 486DX3, 486SX, 80487SX, P24, and P23T come in 169-pin
packages. When these processors are installed, an extra row of socket
pins should show on all four sides of the socket, as shown below.
4 Complete installation by lifting the ZIF lever to the other side of the
socket, as shown below.
Action
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