Hardware Hobbyists vs. Emulator Jockeys

[Johnny Billquist]

Dave McGuire <mcguire at neurotica.com> wrote:

> On Jun 18, 2009, at 5:30 AM, Johnny Billquist wrote:
>>>>> >>> > But I don't lioke changing the classic machine. Not even  
>>>> >>> replacing  > PSUs
>>>>> >>> > with switchers. The original PSU is part of the design, and I  
>>>> >>> want to
>>>>> >>> > keep it that way.
>>> >>    While I agree with you here, I have to admit that, if my  
>>> >> PDP-11/70  had switching power supplies, I'd probably run it a lot  
>>> >> more often.   I'd *never* make it an irreversible modification,  
>>> >> though.
>> >
>> > Um. An 11/70 have switched power supplies normally. Did you remove  
>> > them and install large transformers? That would become a very heavy  
>> > machine in that case.  :-) 
> 
>    Nope, see my other message...it already has large transformers,  
> and it is definitely a very heavy machine!  ;) 

An 11/70 is a heavy machine, indeed. But if you were to have 
transformers to supply all the power needed, you'd increase the weight 
significantly...
I have removed the power supply for the memory of a KL10, and that is 
really a linear supply. The weight, and power consumption of that is on 
a totally different scale to anything switching...

Where have you seen any large transformers in an 11/70 by the way?

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol