A set of locations in a common RAM storage area, reserved for data addressed to specific peripheral units as well as other microprocessors in the immediate environment.; 在公用的隨機存取存儲區(qū)域中保留的一組存儲單元，它是在直接環(huán)境中用來存放準 備送給特定的外圍設(shè)備和其它微處理機的數(shù)據(jù)的。