XPost: uk.d-i-y, alt.home.repair, uk.legal   
   From: bowman@montana.com   
      
   On 01/04/2022 12:05 PM, Commander Kinsey wrote:   
   > On Tue, 04 Jan 2022 17:05:30 -0000, Andrew   
   >  wrote:   
   >   
   >> On 04/01/2022 16:08, charles wrote:   
   >>> In article , Harry Bloomfield Esq   
   >>>  wrote:   
   >>>> rbowman wrote :   
   >>>>> Osborne came out with a 100 column conversion for the Osborne 1. CMOS   
   >>>>> was a new technology and while it normally saved power, dissipation   
   >>>>> increased with frequency. The circuit would work until the chip got   
   >>>>> hot. I replace it with the equivalent LS part and all was good.   
   >>>   
   >>>> The BBC computer had a similar problem - the early versions had to have   
   >>>> an heatsink on a certain chip to keep it cool, I half remember.   
   >>>   
   >>> I had one of the very early ones and don't remember any such problem.   
   >>>   
   >>   
   >> They were supplied initially with a non-switching P/S that ran rather   
   >> hot, but a better switch-mode power supply (astec?) was supplied   
   >> free-of-charge a few months later.   
   >   
   > The ones I encountered were very heavy, so I assume not switching.  I   
   > don't remember excessive heat.  It's not like we used to run the CPUs   
   > flat out back then.   
      
   What, you didn't have a Turbo button?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)