RQDX2 & 3 jumpers - test-drb@ccmp.vtda.org

11 Oct 1998

On Oct 11, 10:46, Zane H. Healy wrote:
...
  Subject: Re: RQDX2 & 3 jumpers
 Bruce Lane spoke:
 >	I've posted jumper and cabling details of the RQDX2 and RQDX3 to my web

...
  Great!  This answers some of my questions.  Now to
show what an ingrate I
 am, does anyone have any info on the following jumpers:

 	W12..W17 
These set the starting "logical unit number" for board, as a binary number
(W12=LSB, W17+MSB).  If you have multiple RQDXn boards, you'd typcally set
the second card to start with LUN 4, the third with LUN 8, etc.  Jumper out
= 0, jumper in = 1.

...
  	W23 -- I think this is for what kind of cabinet that
the card is in.

No, it controls the HEADSEL 3 and REDUCWRTI signals.  W23 has 4 posts
numbeerd 1..4.  Factory setting is 1-2 jumpered on early firmware, 1-2 and
3-4 for version 2 firmware (ROMs 23-243E5/23-244E5) or later.
 Alternatively, you can jumper 2-3, which has the effect of connecting
HEADSEL 3 to pin 9 of J1, and REDUCWRTI to pin 22.  That allows you to use
hard drives with more than 8 heads.

-- 

Pete						Peter Turnbull
						Dept. of Computer Science
						University of York