The lowest 640 kilobytes of memory in an IBM PC-compatible computer running MS-DOS. Other PC operating systems can usually compensate and “ignore” the fact that there is a 640K limit to base memory. This was put in place because the original CPU – the Intel 8088 – could only access one megabyte of memory, and IBM wanted to reserve the upper 384KB for device drivers. The high memory area (HMA) lies above 640KB and can be accessed on MS-DOS computers that have an A20 handler.
- Base metal
any metal other than a precious or noble metal, as copper, lead, zinc, or tin. Compare noble metal, precious metal. the principal metal of an alloy. the principal metal of a piece underlying a coating of another metal; core. Historical Examples He knows it is only base metal, washed over with a thin varnish of […]
- Base number
noun a number or quantity which is arbitrarily made the fundamental number of a system; also called base Examples Ten is the base number of the decimal system of numeration. Historical Examples So I suppose it took three times the base number for the third batch? Double or Nothing Jack Sharkey
- Base of heart
base of heart base of heart n. The part of the heart formed mainly by the left atrium and to a lesser extent by the posterior part of the right atrium, directed backward and to the right, and separated from the vertebral column by the esophagus and aorta.
- Base of skull
base of skull base of skull n. The interior aspect of the skull, on which the brain rests. The inferior or external aspect of the skull.