Looking for early versions of MicroVMS & VWS

[Phil StSauveur]

8600:     4.2  VUP
785:      1.7  VUP
780:      1.0  VUP*
MVII:      .9  VUP
750:       .6  VUP
PDP11/70:  .6  VUP
uPDP11/73: .45 VUP
MVI:       .35 VUP
730:       .3  VUP
uPDP11/23: .15 VUP

\philst

-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of Ethan Dicks
Sent: Tuesday, March 24, 2009 11:46 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Looking for early versions of MicroVMS & VWS


On Wed, Mar 25, 2009 at 12:09 AM, Zane H. Healy <healyzh at aracnet.com> wrote:
> At 4:15 PM -0400 3/24/09, Paul Koning wrote:
>>
>> RSTS on an 11/73 driving an TU50 would stream quite well (with 
>> Backup).  Is a MicroVAX-I slower than that?  Or does RSTS do 
>> streaming I/O better than VMS?  (I suppose that's possible...)  
>> Interrupt latency shouldn't be much of an issue; the thing is that 
>> you have to queue up multiple buffers.
>
> Isn't the PDP-11/73 about twice as fast as a MicroVAX I?  Remember the 
> MicroVAX I is only 0.3 VUPS.

I never got to play with an 11/73 back in the day (we stopped buying PDP-11 gear around the days of the F-11 chip), but I would not be shocked to learn that the J-11 is twice as fast as a MicroVAX-I.  It really is dog slow.  It's a good thing the MicroVAX-II was much, much faster or DEC would have been in trouble long before they eventually got into trouble.

-ethan