[Simh] More than 4 Drives ?

[A.Bucher at alcatel.de]

Hi,

> Seems that simh is limiting me to having a maximum of 4 Drives, rq0 to
rq3.
> When I try and define an rq4 I get a "Unit disabled" error.


> Have looked through the faq, but didn't see anything on this being a
limitation.


yep, that's right - on real DEC hw, there were only 4 devices per
controller.


if you need more than 4 disk drives emulated, you can activate the
emulation


of up to 4 MSCP controllers:


sim> set rqb enabled


sim> set rqc enabled


sim> set rqd enabled


(rq aka rqa is enabled by default)


this gives you a total of 4x4=16 drives.
now you can define the characteristics of each drive as for rq, like:


sim> set rqb0 ra92 (standard RA92)


sim> set rqc2 rauser=4000  (ra81 like drive with 4GB)


sim> set rqd4 cdrom


and attach the physical disk image files as necessary.


if you really want more than 4 drives per controller, I think you need to
modify the source code and recompile.


Kind regards,


Andreas