From: richvh@citlink.net   
      
   Bu wrote:   
   > 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   
   That's talking about the CPU to EI cable, but the original query in this   
   thread, to wit:   
    >I have been looking for some time to purchase a flat cable that   
    >connects expansion interface to *floppy*drive*. Any suggestions?   
   is not.  The cable to the floppy drive has nothing to do with whether or   
   not the EI is buffered or not.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)