On 2/17/16 5:18 AM, Henry Bent wrote:
Hi Will,
I know that this isn't quite what you were asking, but on my real
11/23 running RT-11 I have four RL02s (well, a Dilog DQ614 and an MFM
disk emulating four RL02s) and that is more than enough storage for my
purposes. In addition, if you know that you aren't going to need all
of a physical disk for a specific purpose, you can just mount a disk
image as a logical disk. For example, I have CDISK.DSK and TCPIP.DSK
on DL2:, and those images are mounted as C: and TCP:.
SIMH allows for four RL02s at 10MB each and eight RK05s at 5MB each,
so there's no difference in total storage. As far as I'm concerned
it's somewhat more convenient to have a smaller number of larger
capacity disks. If you need a full 80MB of storage I don't see why
you couldn't use both controllers/disks. You could also use RD5[1-4]
disks (DUx: to RT-11, the RQ controller in SIMH) if you really need
more space, though I believe RT-11 is limited to 32MB on a single
filesystem so you would have to partition the larger disks.
My understanding is that there is not a "preferred" disk controller or
type under SIMH. I have found that for an emulated Ultrix system,
running off of an RD54 is noticeably faster than running off of RL02s,
but on a reasonably fast host system you probably won't notice the
difference under RT-11.
My final note is: if you're curious about something, just try it!
Make a backup of your current working system and then go wild. That's
the fun of SIMH. Want to see if RT-11 will recognize an RA82? Or
sixteen RC25s? Does RT-11 work with a TU56 DECtape? I have no idea
what the answer to any of those questions is, but I know how to find out.
-Henry
Henry, Ha! After I wrote my note, I went off and tried a bunch of
configurations. After reading your note, I realized that the two 622.9
MB RA82's I created may be overkill :). I think I'll go back to using
RL02's for system and storage disks and use RK05's or disk images for my
programming language disks. I totally forgot about disk images.
Thanks,
Will
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