From: bjjlyates@NOSPAMbellsouth.net   
      
   On 8/6/08 6:11 PM, in article 142dnT2R9s4tvAfV4p2dnAA@telenor.com, "Knut   
   Roll-Lund"  wrote:   
      
   > Joe Zwerko wrote:   
   >> Yet another update monologue...   
   >>   
   >> ABRA doesn't have the MB8876A or the 1791, their web-site is out of date...   
   >> I'm pinning all success on the eBay auction parts.   
   >>   
   >> I also found the SD211DE MOSFETs on eBay.  She has 10 left at $2.50+$5.00s/h   
   >> a pop.  ESD precautions unclear.  How is it that a 2ns DMOS transistor cost   
   >> less than $1.00 in 1983, when new types cost $50.00 today?   
   >>   
   >> Or better yet, instead of a VCO that has to switch frequencies on the fly,   
   >> why didn't Aerocomp just use two oscillators, a synchronizer, and a friggin'   
   >> mux?   
   >>   
   >> Yeah, I'm disgruntled, but I'm still gonna build this sucker.   
   >>   
   >> phb.   
   >>   
   > ...   
   >   
   >   
   > I think crystals were really expensive, but I have seen many strange   
   > circuits. Somtimes I get the idea that they have a load of stored   
   > components they need to use up so...   
   >   
   > I think I would get some of the circuit from the eaca dd-kit and some   
   > from the aerocomp one. I have yet another dd-kit by Arc and it is still   
   > differen, uses a differet but compatible floppycontroller with inbuilt   
   > precomp but has a strange circuit with a cmos switch for switching   
   > resistance in and out for something that is different for 8" and 5.25".   
      
   Could that be write enable/protect?   
      
   On 8", you put a tab over the side hole, called a "write enable" tab.   
   Otherwise, you cannot write to it.   
      
   On 5.25", you put a tab over the side hole, called a "write protect" tab.   
   To keep you from writing to it.   
      
   Over the years, I've begun to appreciate the 8" method, b/c write protect   
   tabs have a tendency to fall off. Some of the newer ones wouldn't last a day   
   before they'd come right off. Tape worked better.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)