https://datasheet.datasheetarchive.com/originals/library/Datasheet-017/DSA00295971.pdf
National Semiconductor's new SCSI Interface devices raise the standard
of low cost SCSI. National Semiconductor has two new low cost, high
performance Small Computer Systems Interface (SCSI) devices; the DP5380
and DP8490. The DP5380 Asynchronous SCSI Interface (ASI) is pin and
program compatible with the NMOS NCR5380 type device, but since it is manufactured in CMOS it offers speed and power advantages. The DP8490
Enhanced Asynchronous SCSI Interface (EASI) is pin compatible with the
ASI, and program compatible until its enhanced mode is set.
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