From: alpinist@petrofsky.org   
      
   Rogelio Perea  writes:   
      
   > While not a pressing matter, I have been looking for the Tandy issued   
   > graphics card hardware for both the TRS-80 Models III & 4. Have not   
   > seen any on Ebay nor Craigslist and beyond the references in some of   
   > the TRS-80 related websites, there is no pictures to go by in case I   
   > happen to stumble upon one at a flea market.   
   >   
   > Anyone with some insight on where to find more info on this hardware   
   > upgrade for the machines?   
      
   I don't know of any pictures of complete boards, but in the service   
   manuals you can find a lot of information, including the board circuit   
   traces and component-label silkscreens.  You could identify a board by   
   looking for the part number 8709297 or 8709397 (for Model III or 4)   
   written as part of the solder-side circuit trace.   
      
   The 26-1125 service manual, "TRS-80 Model III Computer Graphics   
   Upgrade Kit", was scanned by David J. Cooper in 2010 and made   
   available at his Marmotking archive, here:   
   http://marmotking.com/327a0f31bb7061464c18469d8dd1e999/downloads.html   
      
   For the Model 4 graphics board, see either the Model 4 service manual   
   or the Model 4P service manual.  A copy of the latter, scanned by   
   Larry Fosdick in 2005, can currently be found at multiple locations,   
   including these:   
   http://www.classiccmp.org/cpmarchives/trs80/Library/Manuals/Hard   
   are/Model%204P%20Service%20Manual%20(1984)(Tandy).pdf.7z   
   http://www.1000bit.it/support/manuali/trs/Model%204P%20Service%2   
   Manual%20%281984%29%28Tandy%29%28pdf%29.pdf   
      
   -al   
      
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