From: si@si.si   
      
   On Sun, 10 Feb 2008 21:20:17 GMT, Richard VanHouten   
    wrote:   
      
   >> On Sun, 10 Feb 2008 01:55:37 -0800 (PST), Mal    
   >> wrote:   
   >>   
   >>> On Feb 10, 2:55 am, "thom527"  wrote:   
   >>>> Greetings!   
   >>>>   
   >>>> I have been looking for some time to purchase a flat cable that connects   
   >>>> expansion interface to floppy drive. Any suggestions?   
   >>>>   
   >>>> thanks in advance   
   >>>>   
   >>>> Manuel   
   >>> Two options: Either make the cable yourself, or try one of the vendors   
   >>> who sell cables on eBay.  I have previously found "twlf2" helpful for   
   >>> made-to-order cables (though the cost of frieght to Australia proved   
   >>> too expensive).  If you need an email address for twlf2, let me know.   
   >>> If you make the cable yourself, note that some pins need to be removed   
   >>>from the connectors (drive select is achieved by this means). If you   
   >>> need more details, I am happy to help.   
   >> Hi   
   >> I was just reading on a TRS yahoo group that if you connect a TRS-80   
   >> with a EI that needs a buffered cable tahat you short out the supply   
   >> voltage.   
   >> So you better make sure what your EI needs. I am sure that you can   
   >> find this out based on the partnumber or serialnumber.   
   >> Bu   
   >   
   >He was inquiring about the cable from the EI to the disk drives, not EI   
   >to the CPU.  The only concern with the drive cables is drive addressing;   
   >Tandy selected all drive selects at the drive, and pulled pins from the   
   >cable (all but the single select used by that drive position) which is   
   >completely different from how IBM did it (all drives have DS1 ONLY   
   >selected, and a twist is put in the cable to select between DS0 and DS1)   
      
   I believe he was talking about the flat cable between the keyboard and   
   the EI.   
   But maybe i am misinterpreting the issue.   
   Here it is to read for your self:   
   ->> I think the EI you had should have a buffered cable and needed a   
   ->> similarly modified "keyboard" as well as the actuall buffered   
   cable.   
   ->> EI's that have this modification are usually marked with a sticker   
   ->> 'WARNING Use only with buffered expansion interface cable'. Do you   
   have   
   ->> the buffered cable? I think something will burn if you use a   
   straight   
   ->> cable because you are connecting 5V to 0V. As well as the buffered   
   cable   
   ->> the "keyboard'" needs to have some signals in a 6pin DIN plug (RAS   
   CAS).   
   ->   
   ->Early EI's needed the buffered cable, later ones did not. Look up   
   your S/N   
   ->and model to be sure. Be sure that everything is powered on, there   
   are three   
   ->plugs - one for the Model 1, one for the EI, and one for the   
   monitor.   
   ->   
   Bu   
      
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