PORTIBM PC Portable (uses same BIOS as XT) 0072-0075 - AMD-645 Peripheral Bus Controller - ACCESS TO EXTENDED CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption.
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0070h

0072  RW  CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. memory address, region 2 (256 bytes)
0073  RW  CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. memory data, region 2
0074  RW  CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. memory address, region 3 (256 bytes)
0075  RW  CMOS(Complementary Metal-Oxide-Semiconductor) A type of integrated circuit design known for its low power consumption. memory data, region 3
Note:	on the AMD-645, ports 0072h and 0073h allow access to a full 256 bytes
	  of RAM(Random Access Memory)	See also DRAM, SRAM., including the standard 128 bytes available through ports
	  0070h and 0071h