[HECnet] SIMH VAX memory weirdness

Sun Nov 28 14:52:32 PST 2010

A 90A runs at 83 MHz and is rated at 40~42 VUPS. The 90 is somewhat slower. A laptop is also slower than a pc, its cpu runs at two thirds the clockspeed of a desktop. And when its cpu is utilized at 100% (as simh does) then the box heats up considerably. For sustained use a laptop may not be the desired platform. BTW I guess that simh is restricted to run on a single core. You'll probably see 50% cpu utilization for the simh process. 
A faster single core might improve things.
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From: Sampsa Laine <sampsa at mac.com>
Sender: owner-hecnet at Update.UU.SE
Date: Sun, 28 Nov 2010 22:16:15 +0000
To: <hecnet at Update.UU.SE>
ReplyTo: hecnet at Update.UU.SE
Subject: Re: [HECnet] SIMH VAX memory weirdness

Sure - but I thought a VAXstation 4000/90 got like 40ish VUPS, whilst my relatively recent Core 2 Duo + SIMH only get about 14?

I wonder how much faster say CHARON VAX would be, I gather it's quite thoroughly optimised?

Sampsa

On 28 Nov 2010, at 22:13, hvlems at zonnet.nl wrote:
When you run the PDP-11 simulator on a fast host then it willl blow the socks off any hardware PDP-11. The same applies for the VAX of course. Even with the burden of a host OS a 3 GHz Pentium has excess power to simulate a VAX whose own cpus's ran well below 200 MHz. And simh wasn't even optimized because it runs on a multitude of hosts. 
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From: Sampsa Laine <sampsa at mac.com>
Sender: owner-hecnet at Update.UU.SE
Date: Sun, 28 Nov 2010 21:14:33 +0000
To: <hecnet at Update.UU.SE>
ReplyTo: hecnet at Update.UU.SE
Subject: Re: [HECnet] SIMH VAX memory weirdness

Dell Latitude E6500 (it's a Core 2 Duo at 2.5 GHz I think), running Ubuntu Desktop, Oracle VirtualBox and Ubuntu Server inside the VM, then I run SIMH inside the Ubuntu server - this way the main host OS and the SIMH install can talk to each other over the network.  

I get about 7 VUPS on my Mac Mini (a 1.66 GHz Core Duo), so the 14 VUPS is about right, a 2.5 GHz Core 2 is about twice as fast as a 1.6 GHz Core...

Sampsa

On 28 Nov 2010, at 21:05, Steve Davidson wrote:
Sampsa,

What kind of a laptop and what OS are you running?   The 3900 series systems ran about 38 VUPs and the 780 ran at 1 VUP...

-Steve

From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Sampsa Laine
Sent: Sunday, November 28, 2010 15:54
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] SIMH VAX memory weirdness

That worked!  

Cool, I now have a 14 VUPS laptop with 512 megs of RAM. Just trying to get DECWINDOWS to work, I'm assuming I can get it to display remotely even though it has no graphics hardware built in, right?

Sampsa

On 28 Nov 2010, at 20:49, H Vlems wrote:
The VAX 11/780 may well have been limited to just 32 MB, I can   t remember.
Try modifying PHYSICAL_PAGES, perhaps the microcode that comes with simh was modified.

Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens Sampsa Laine   Verzonden: zondag, november 2010 21:46   Aan: hecnet at Update.UU.SE   Onderwerp: Re: [HECnet] SIMH VAX memory weirdness

Ah, bummer - what about the 11/780?      Sampsa         On 28 Nov 2010, at 20:44, Steve Davidson wrote:      > Sampsa,   >   > I'm pretty sure that the 3900 series machines only supported 64MB max   > and that is what you are emulating.   >   > -Steve   >   >   > -----Original Message-----   > From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On   > Behalf Of Sampsa Laine   > Sent: Sunday, November 28, 2010 15:41   > To: hecnet at Update.UU.SE   > Subject: Re: [HECnet] SIMH VAX memory weirdness   >   > Still only seeing 64 MB in the OS....   >   > Sampsa   >   >   > On 28 Nov 2010, at 20:27, Oleg Safiullin wrote:   >   >> On 29.11.2010 2:20, Sampsa Laine wrote:   >>> I just increased the memory on one of my SIMH VAX VM's to 512 MB from   > 64 MB - the system boots fine but SHOW MEMORY (under OpenVMS 7.3-1)   > still reports 64 MB.   >>>   >>> Do I need to tell the VMS installation about the new RAM somehow? How   > much RAM does 7.3-1 (VAX) support anyway?   >>>   >>> Sampsa   >>>   >>>   >>   >> Try to replace ka655.bin firmware with the following file:   >>   >> http://pdp-11.org.ru/~form/files/ka655x.bin   >

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