Topic       : Pure Assembler Documentation
Author      : John Kormylo
Version     : PASM.HYP 1.0
Subject     : Documentation/Pure Assembler
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HCP-Version : 3
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View Ref-File[ NCR5380 SCSI Protocol Controller           -- TT only -- ]

... drives the SCSI bus used by both internal and external hard drives
(in addition to the ACSI port).  It has 8 read and 8 write registers
which are all directly accessable.

Address | Read/Write Register
--------+-------------------------------------------------------------
$FF8781 | SCSI Data Register
$FF8783 | SCSI Initiator Command Register
$FF8785 | SCSI Mode Register
$FF8787 | SCSI Target Command Register
--------+----------------------------+--------------------------------
Address | Write Register             | Read Register
--------+----------------------------+--------------------------------
$FF8789 | SCSI ID Register           | SCSI Bus Status Register
$FF878B | SCSI DMA Send Register     | SCSI Bus/Status Register
$FF878D | SCSI DMA Target Receive    | SCSI Input Data Register
$FF878F | SCSI DMA Initiator Receive | SCSI Reset Parity/Interrupt

XBIOS: DMAread and DMAwrite.

See also SCSI Signals and SCSI Phases.