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Socket 1
Socket 1 was a 169 pin LIF/ZIF PGA (following a 17x17 matrix) socket, the second of a series of standard sockets created by Intel into which various x86 microprocessors were plugged. It was an upgrade to Intel's first standard PGA socket and the first with an official designation. Socket 1 was intended as a 486 upgrade socket, and added one extra pin to prevent upgrade chips from being inserted into the older socket.
Specifications
Type	PGA
Connections	169 (17x17)
Pitch	2.54 mm
Bus protocol	486
FSB	16, 20, 25, 33, 40, 50 MHz
Voltage range	5V
Used for	AMD 486, Cyrix 486, IBM 486, Intel 486, ST 486, Texas Instruments 486, UMC 486
Compatible with	PQFP-196 -> PGA-168, SQFP-208 -> PGA-168, CPGA-168, CPGA-169

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