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Mailbox In
An area in main memory assigned by the host microcomputer soft- ware for communication with the host adapter. The host adapter places status and pointer information in entries in the Mailbox In (MBI) to indicate to the host microcomputer what operations have been completed or what information must be obtained from the host microcomputer.
Mailbox Out
An area in main memory assigned by the host microcomputer soft- ware for communication with the host adapter. The microcom- puter software places commands and pointer information in entries in the Mailbox Out (MBO) to indicate what operations should be started by the host adapter.
Manager
The component of a driver which is specific to a particular board architecture and presents a standard ASPI
MBI
See Mailbox In.
MBO
See Mailbox Out.
Multi-tasking Operation
The execution of commands in such a way that more than one command is in progress at the same time, allowing the system to take advantage of overlapping activities by using resources that are temporarily not required for other operations. More than one program or more than one portion of a program may be operating in parallel.
PC-AT
A family of small computers sold by IBM, also called the Personal Computer/AT family of computers. The name is trademarked by IBM.
