XPost: uk.d-i-y, alt.home.repair, uk.legal   
   From: jon@home.net   
      
   On Tue, 04 Jan 2022 15:42:08 +0000, 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 also   
   > had a timing issue with an S100 computer I built and partially designed.   
   > I finally spotted the issue, when I could afford to buy a 'scope, but by   
   > then it was too late - my homebuilt was due for replacement with   
   > something better.   
   >   
   > I think now that designer have simply become more skilled and obviously   
   > the range of components have improved massively.   
      
   They use logic analysers in simulations now before the design gets   
   anywhere near a product.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)