For Asynchronous (ASYNC) transfer we have a term and definition in SCSI.

A method of transferring data that requires that the bus wait for a REQ-ACK handshake for each byte of data. This results in a maximum data transfer rate of 5 MBytes/second that decreases quickly with even small increases in cable length. All SCSI bus negotiations are carried on asynchronously, even on a synchronous SCSI bus. On a synchronous SCSI bus, only actual data transfers are accomplished synchronously.
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