[Info-vax] Y3K for PDP-11 Operating Systems

[Rob Brown]

On Fri, 6 May 2011 at 16:13 -0600, Johnny Billquist wrote:

> On 2011-05-06 12.08, G Cornelius wrote:
>
>> If in fact your code fit into the address space and did not need 32 
>> bit arithmetic, it could be fast.  The first time I started working 
>> in a group that had VAXen I noticed two 750's sitting off to the 
>> side because they had not been able to handle the application load. 
>> Their replacement: a pair of 11/84's. Granted, this was specialized 
>> in that the language interpreter had to do a lot of single byte 
>> operations, resulting in the initial versions, on 750's at least, 
>> being rather inefficient. Sometimes extra bits just mean extra 
>> overhead.
>
> Heck. The 11/750 is not a fast machine. It's definitely slower than 
> an 11/84, unless you do things that the VAX can do natively and the 
> PDP-11 can't.

It seemed to me that the 11/750 was even slower than an 11/44, but 
perhaps that had something to do with their respective workloads.


-- 

Rob Brown                        b r o w n a t g m c l d o t c o m
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