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+# Radius Powerview: SCSI Command Set
+
+# SCOPE
+This document applies to the following hardware devices:
+- Radius Powerview (Model 825-0496-03 A)
+
+
+and to the following firmware revisions:
+- TBD
+
+All numbers are expressed in hexadecimal, unless otherwise noted.
+
+# COMMAND SET SUMMARY
+The following is a list of the observed SCSI commands:
+- 03    Request Sense
+- 08    Read
+- 09    Retrieve Statistics
+- 0a    Write
+- 0c    Set Interface Mode / Set MAC Address
+- 0d    **Unknown startup command**
+- 0e    Enable/disable Interface
+- 12    Inquiry
+
+A number of other SCSI commands are implemented, but their usage is not yet fully known.
+
+## Unknown Startup Command (0d)
+Command:  0d 00 00 00 06 00
+
+Function: ***Unknown at this time***
+
+Type:     Input (Transitions to DATAOUT)
+
+Host then sends: `00 09 00 07 FF FF FF 00` (The last 00 might not actually be there?)
+
+Note: The AppleTalk broadcast address is 09:00:07:ff:ff:ff.
+
+This is probably configuring the Multicast Address Registers of the [DP83902A Ethernet receiver](./docs/DP83902A.pdf) inside the DaynaPort SCSI Link
+
+    10.9 MULTICAST ADDRESS REGISTERS (MAR0 –MAR7)
+    
+    The multicast address registers provide filtering of multicast 
+    addresses hashed by the CRC logic. All destination addresses 
+    are fed through the CRC logic and as the last bit of the 
+    destination address enters the CRC, the 6 most significant bits 
+    of the CRC generator are latched. These 6 bits are then decoded 
+    by a 1 of 64 decode to index a unique filter bit (FB0 –63) in 
+    the multicast address registers. If the filter bit selected is 
+    set, the multicast packet is accepted. The system designer 
+    would use a program to determine which filter bits to set in 
+    the multicast registers. All multicast filter bits that 
+    correspond to multicast address accepted by the node are then 
+    set to one. To accept all multicast packets all of the 
+    registers are set to all ones.
+
+
+
+## Enable/disable Interface (0e)
+Command:  0e 00 00 00 00 XX (XX = 80 or 00)
+
+Function: Enable (80) / disable (00) Ethernet interface
+
+Type:     No data transferred
+
+Notes:    After issuing an Enable, the initiator should avoid sending
+          any subsequent commands to the device for approximately 0.5
+          seconds
+
+## Inquiry (12)
+Command:  `12 00 00 00 LL 00` (LL is data length)
+
+Function: Perform a standard SCSI Inquiry command: reference the
+          SCSI spec for further information
+
+Type:     Input; reference the SCSI spec for the data returned
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