P9      Intel 80386SX processor
 P4      Intel 80486DX processor
 P4S     Intel 80486SX processor
 P23S    Intel 80487SX processor
 P23T    Intel 80486 OverDrive processor (169 pin PGA)
 P4T     Intel 80486 OverDrive processor (168 pin PGA)
 P24S    Intel 80486DX2 processor
 P24D    Intel 80486DX2WB processor (integrated 8 KB writeback L1 cache)
 P24C    Intel 80486DX4 processor
 P24T    Intel Pentium OverDrive processor (with 63 or 83 MHz; Vcc=5V)
 P24CT   Intel Pentium OverDrive processor (with 63 or 83 MHz; Vcc=3.3V)
 P5      Intel Pentium processor (with 60 or 66 MHz; Vcc=5V)
 P54C    Intel Pentium processor (with 75, 90, 100, 120 or 133 MHz; Vcc=3.3V)
 P54CT   Intel Pentium processor (with 125 to 180 MHz; ZIF socket #5)
 P54CTB  Intel Pentium processor (with 160, 180 or 200 MHz; ZIF socket #7)
 P55C    Intel Pentium processor (like P54CTB: new mask with 16+16K L1 cache)
 P55CT   Intel PentiumPro OverDrive processor (for the iP54C socket)
 P6      Intel PentiumPro processor (with 133, 150, 166, 180 or 200 MHz)