allisonp_at_world.std.com (Allison J Parent) Wrote:
>17772150 it the default first device and the default bootable. If there
>is two the second will be at 17760334. For RQDXs the LUN jumper must
>corospond to how many units.
Right... but default secondary device for a DU handler is 17772144.
(The reason for this is because back when the driver was developed,
someone decided that since the vector was programmable, and the default
was at 154, and nothing was at 150, that subsequent vectors would
decrease by 4. This was then extended to the CSR... It wasn't
until later that we found that the default secondary CSR was to be
at 17760334. It never got changed. I think it is still that way
for the to-be-released V5.7)
>I believe PDP-11 ROM BOOT expects to boot from the default first (*2150)
>unless the DU.sys driver has been changed for the second address. RT-11
>itself will boot/run on anything you have a driver for. Megan would
>know for sure. I've never found it necessary to have two MSCP disk
>controllers in a PDP-11 (I was using them in the vax instead!).
So long as the address/vector match what is set in the device handler,
it should boot. (I have a system at home with three, and at times
four, MSCP adapters for various disk types -- MSCP, SCSI, ESDI, DSSI)
Megan Gentry
Former RT-11 Developer
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Received on Wed Oct 14 1998 - 18:02:03 BST