----- B.E.R.T. SCSI bios -----

The reason I mailed this list to the mailing list is; I think a lot of people
want to programm SCSI stuff, but don't know how... I hope this short doc will
help them with it.


** For more scsi documentation;
	nic.funet.fi/pub/doc/scsi/scsi_1_doc.tar.gz
	(i'm not sure about the filename, it's something with scsi 1 in it, it
	contains the full ansi x3.131-1986 standard)


Adress | Inputs/Outputs	| Purpose
-------+-----------------------+-----------------------------------------------
 7F80	|      ---		| B.E.R.T.-mark, must contain "HD!", if not,
	|			| there is no B.E.R.T. available.
	|			|
 7F83	|      ---		| Nothing, this routine will perform a DI-HALT.
	|			|
 7F86	|      ---		| Target selected, continue with data transfer.
	|			|
 7F89	| In:			| Read a physical sector.
	| [CDE]=physical sector |
	|  [HL]=buffer address	|
	|  [B ]=no. of sectors	|
	|  [A ]=target (1)	|
	|			|
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7F8C	| In:			| Write a physical sector.
	| [CDE]=physical sector |
	|  [HL]=buffer address	|
	|  [B ]=no. of sectors	|
	|  [A ]=target (1)	|
	|			|
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7F92	| In:			| Inquiry, this will give info about the target
	|  [HL]=buffer address	|
	|  [A ]=target (1)	|
	|			|
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7F95	| In:			| Read capacity, this will give info about the
	|  [HL]=buffer address	| size of the target.
	|  [A ]=target (1)	|
	|			|
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7F98	| In:			| Mode sense, return current mode-parameters
	|  [HL]=Buffer address	|
	|  [A ]=target (1)	|
	|			|
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7F9B	| In:			| Mode select
	|  [HL]=Buffer address	|
	|  [A ]=target (1)	| *** Used to initialize the HD ***
	|			| *** BE CAREFULL ***
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7F9E	| In:			| Format unit
	|  [A ]=target (1)	|
	|			| *** Used to initialize the HD ***
	| Out:			| *** BE CAREFULL ***
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|
 7FA1	|      ---		| Test unit ready
	|			|
 7FA4	|      ---		| Cold boot
	|			|
 7FA7	|      ---		| Make SCSI drive table
	|			|
 7FAA	|      ---		| Print ESC-K on screen
	|			|
 7FAF	| In:			| Perform a SCSI-command
	|  [IX]=pointer to com- |
	|	mand string	|
	|			|
	| Out:			|
	|  [ F]=carry set->error|
	|  [D ]=error code (2)	|
	|			|

(1) The SCSI target:	b7 b6 b5 b4 b3 b2 b1 b0
			lun	 0  0  target

    Target and LUN must be between 0-7.

 (2) Error codes:
	00-No error
	02-Check condition
	08-Target busy
	0C-Reservation conflict
	10-Occurs with linked commands