PORTIBM PC Portable (uses same BIOS as XT) 0CF9 - Intel chipsets - TURBO/RESET CONTROL REGISTER Notes: this port can only be accessed via 8-bit IN or OUT instructions by the CPU(Central Processing Unit) The microprocessor which executes programs on your computer. supported by the Intel "Saturn" and "Neptune" (82434NX) chipsets, the Intel 82454KX/GX (450GX chipset), Intel 82420EX chipset, etc. SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) C051h,#01055,#01239 0CF9 RW reboot system, optionally selecting de-turbo mode (see #P0946) Bitfields for Intel 82420EX turbo/reset control register: Bit(s) Description (Table P0946) 7-4 reserved (0) 3 (450KX/GX only) enable CPU(Central Processing Unit) The microprocessor which executes programs on your computer. BIST on reset 2 reset CPU(Central Processing Unit) The microprocessor which executes programs on your computer. 1 reset mode 0 soft reset 1 hard reset 0 deturbo mode Note: when resetting the CPU(Central Processing Unit) The microprocessor which executes programs on your computer., two writes are required: the first sets the state of bit 1 while keeping bit 2 cleared, and the second sets bit 2; the reset occurs on bit 2's transition from 0 to 1. SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) C051h