PORTIBM PC Portable (uses same BIOS as XT) 0601 - Headland HL21, Acer M5105 chipsets - SYSTEM CONTROL 0601 -W system control (see #P0914) 0601 R- status (see #P0915) Bitfields for Headland HL21/Acer M5105 system control register: Bit(s) Description (Table P0914) 7 =1 power LED on 6 =1 LCD(Liquid Crystal Display) backlight off 5 ??? 4 ??? 3 ??? 2 =1 video chips disabled, screen blanked. 1 ??? 0 =1 will lock up your machine! SeeAlso: #P0915 Bitfields for Headland HL21/Acer M5105 status register: Bit(s) Description (Table P0915) 7 =0 if screen enabled always these values 6 =0 5 =0 4 =0 3 =0 2 =1 (=0 at low power) 1 =0 power OK 0 =0 SeeAlso: #P0914