28 Nov
2013
28 Nov
'13
8:54 a.m.
On Thu, Nov 28, 2013 at 8:39 AM, Charles Dickman <chd at chdickman.com> wrote:
What unit numbers to the drives on the second
controller show up at? I have
a CQD-223 as the primary controller and an RQDX3 as the second controller
with an RX50.
The MSCP unit number assignment is controller specific. It can be set
with the built in configuration utility on the CMD CQD-223. On the
RQDX3 it is set by configuration jumpers on the controller.
http://www.bitsavers.org/pdf/dec/qbus/fiche/EK-RQDX3-UG-001_Nov85.pdf
Page 2-2
Starting LUN
The starting LUN equals the binary number represented by jumpers W12
(LSB) through W17 (MSB) multiplied by 4. When jumpers W12 through W17
are removed as shown in Figure 2-2, a starting LUN of 0 is selected.
Refer to Table 2-1 for typical examples.
Most likely in your case with the RQDX3 configured as the secondary
MSCP controller you would want a jumper installed at W12 so the RQDX3
drives start at MSCP unit number 4.