From: jimd@panix1.panix.com   
      
   No, not yet, but I did mail myself a copy. It probably helps to have a   
   field service manual, and secondly, I am not sure I solved all the bus   
   problems. The DMA port supplies most of the printer port, and that does   
   not work, possibly because I killed it. And, after getting all the screws   
   back in, something came loose in the floppy drive circuit, and right now I   
   have little time, and somehow, more important things to do.   
      
   If you do not want things on the external SCSI bus, the problems are   
   fewer.   
      
   I do have a digital camera that should work with photopc for MiNT,   
   batteries, and a storage card. Just not enough time at the moment.   
      
   Jim   
      
   Tom Tom  writes:   
      
   : Hey Jim,   
      
   : Do you have a website with photos to help show what you did?  Maybe some   
   : component references.  Trying to follow your instructions is a little   
   : difficult without some additional clues to the specific locations you're   
   : referring to.   
      
   : Thanks,   
   : Glenn   
      
      
   : "Jim DeClercq"  wrote in message   
   : news:gelg6o$i7t$1@reader1.panix.com...   
   : > Having had a lot of trouble getting hard drives bigger than 4 gig   
   : > to work on a TT030, I thought I would try a Compact Flash card,   
   : > which does not draw much current, and to my surprise, I still had   
   : > bus problems.   
   : >   
   : > This problem has been getting worse, and having worked as a   
   : > failure analysis engineer, I thought I knew what the problem was,   
   : > and I was right, one more time. I went into great detail the   
   : > first time through, but the process is easy and quick.   
   : >   
   : > Five lengths of number 26 stranded wire, or metric equivalent, in   
   : > two colors, about 18 inches, or metric equivalent. Strip one end   
   : > of each, for a half inch (12 mm) twist together, and tin. One   
   : > color gets laid across the bottom end of pins 1 to 3 of the bottom   
   : > of the power connector, and soldered to them. The other color   
   : > gets laid across the bottom ends of pins 5 to 8. Avoid pin 4,   
   : > which is -5 v.   
   : >   
   : > Pins 1-3 are +5, pins 5-8 are ground. The empty pin is at the   
   : > other end.   
   : >   
   : > The free ends of one color, mine was green, and leaving one   
   : > spare, were connected to the plus ends of bypass caps   
   : > geographically closest to the SCSI chip, the TT memory socket,   
   : > the back ST memory socket, and the front ST memory socket.   
   : >   
   : > The free ends of the other color, mine was black, were connected   
   : > to the ground ends of those bypass caps.   
   : >   
   : > When I did this, for the first time, I measured resistance   
   : > between caps and socket pins, and found that the closest had the   
   : > least resistance.   
   : >   
   : > The cap ends, after measuring, using a DVM with a semiconductor   
   : > setting, to see which end was closer to power or ground, were   
   : > marked with two different colors of paint pen, although anything   
   : > that does not interfere with soldering can be used. After that,   
   : > the solution went fast.   
   : >   
   : > This is all done on the bottom side of the board. Having done   
   : > this, everything seems to work fine, and I have a DVD writer and   
   : > one ZIP drive on the external bus, and they both work. There is   
   : > no sign of anything wrong now, and if the printer port fouls up,   
   : > I have a set of spare wires for connecting to a bypass cap in   
   : > that area.   
   : >   
   : > If you look at a TT030 motherboard, you will see wide power   
   : > traces disappearing down very small plated through holes. If they   
   : > were not heavily plated, a little bit of corrosion, and a lot of   
   : > power is lost, and things that drive the bus do not get enough to   
   : > drive it to full voltage. If I had designed that board, the holes   
   : > would have been much bigger, and the plating thicker.   
   : >   
   : > I have not loaded this machine to its historical full, which was   
   : > a DVD writer, two ZIP drives, one tape backup, and a scanner, but   
   : > will get to that, and if on the slight chance that does not work,   
   : > I will find how to fix that. And I will report on how to do that.   
   : >   
   : > I use a windoze machine at work, and do get work done, but for   
   : > personal purposes, a TTM 195 monitor on a TT030 is the perfect   
   : > tool.   
   : >   
   : > This done in pico from MiNT 1.15.12.   
   : >   
   : > Jim DeClercq   
   : >   
   : >   
   : > --   
   : > --   
   : > /"\      Jim DeClercq--jimd@panix.com--Sylvania, Ohio, USA   
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   : >   
      
      
      
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