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Parallel SCSI Interface Product Manual, Rev. A                                        
   85
Table 26:
Extended Message Codes
1. The EXTENDED MESSAGE ARGUMENTS are specified within the Extended Message Descriptions 
in Paragraphs referenced in Table 27.
4.3
Message categories
The messages supported by the various drives are divided up into categories and listed in tables in the follow-
ing subsections. The individual drive’s Product Manual. Table 27 lists messages that are supported by the par-
ticular drive. In the tables, the message code values are given a direction specification (In-Out). Detailed 
descriptions follow the tables. Messages other than those supported by a drive are answered by the drive with 
a MESSAGE REJECT message.
4.3.1
LINK CONTROL MESSAGES
Table 27:
Link Control message codes
Code
Extended message
00h
MODIFY DATA POINTERS
01h
SYNCHRONOUS DATA TRANSFER REQUEST
02h
Reserved
03h
WIDE DATA TRANSFER REQUEST
04h
PARALLEL PROTOCOL REQUEST
05h
MODIFY BIDIRECTIONAL DATA POINTER
06h - FFh
Reserved
Code
Support
Message name
Reference 
 
section
Direction
Clear 
 
attention 
 
condition
IU transfers 
 
disabled
IU transfers 
 
enabled
Init
Targ
Init
Targ
In
Out
04h
O
O
O
O
DISCONNECT
In
Out
Yes
80h+
M
O
NS
NS
IDENTIFY
In
N/A
80h+
M
M
NS
NS
IDENTIFY
Out
Not 
required
23h
O
O
NS
NS
IGNORE WIDE RESIDUE
In
N/A
05h
M
M
M
M
INITIATOR DETECTED 
ERROR
Out
Yes
0Ah
O
O
NS
NS
LINKED COMMAND
 
COMPLETE
In
N/A
09h
M
M
M
M
MESSAGE PARITY 
ERROR
Out
Yes
07h
M
M
M
M
MESSAGE REJECT
In
Out
Yes
01h,05h,00h
O
O
O
O
MODIFY DATA POINTER
In
N/A
01h,09h,05h
O
O
O
O
MODIFY BIDIREC-
TIONAL DATA POINTER
In
N/A
08h
M
M
M
M
NO OPERATION
Out
Yes
01h,06h,04h
M
M
M
M
PARALLEL PROTOCOL 
REQUEST
In
Out
Yes