PORTIBM PC Portable (uses same BIOS as XT) 0075 - Intel 82378IB ("Saturn"/"Neptune" chipsets) - MBOARD CONFIGURATION SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0073h,PORTIBM PC Portable (uses same BIOS as XT) 0078h"82378IB" 0075 R- ??? bits 3-2: external bus speed 00 50 MHz 01 66 MHz 10 60 MHz 11 40 MHz