+OLD CS1 Posted June 15, 2018 Share Posted June 15, 2018 Anyone have schematics for the SNUG BwG? Suddenly external drives no longer work and I suspect I might have harmed a 74xx chip I still have not gotten around to building a Shugart break-out board but I think that shall be moved up on my list. Quote Link to comment Share on other sites More sharing options...
atrax27407 Posted June 15, 2018 Share Posted June 15, 2018 There is a good picture of the board on the SNUG site. Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted June 15, 2018 Author Share Posted June 15, 2018 There is a good picture of the board on the SNUG site. I will check it out. I can pull mine again and reverse it if I have to, I just want a chance to mull it over, first. Before it gets asked, I have SW3 and SW4 "ON" to enable DSK1-DSK4. Quote Link to comment Share on other sites More sharing options...
jens-eike Posted June 15, 2018 Share Posted June 15, 2018 https://www.s-n-u-g.de/bwg/php1245.pdf 2 Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted June 15, 2018 Author Share Posted June 15, 2018 https://www.s-n-u-g.de/bwg/php1245.pdf Many many thanks! Quote Link to comment Share on other sites More sharing options...
+OLD CS1 Posted June 16, 2018 Author Share Posted June 16, 2018 The schematic has been very edifying. It never occurred to me the WD1773 does not have a concept of sides as many times as I have reviewed the datasheet, but then I also never had to do anything this involved. I simply assumed based upon my knowledge of the Amiga floppy system and lack of deeper investigation of the WD117x-based Commodore 1571 and 1581. As well, the schematics have helped me work up a preliminary design for both passive and active floppy break-out boxes -- now to just get that translated from my brain and into KiCad. While, yes, a 74xx chip could have been responsible for my woes, it turns out, as is often the case, the problem is much simpler: the external cable connection to the BwG card-edge connector. The fingers were heavily corroded before and I scrubbed and cleaned them up to get things working with one particular cable I have on-hand. However, I have not been using that cable and was using both a cable I made and another pre-made cable. I am not certain if there is an electrical connection problem between the card-edge fingers and the cable connector or a problem with the two cables. Going with the simplest solution I believe it is a problem with the interface of the two. I have scrubbed, fluxed, and tinned the fingers to try to alleviate but to little avail. I still have to connect the cable at a wonky angle for my test external drive to operate. It is a comfort to know I have not damaged the electronics of the BwG. Quote Link to comment Share on other sites More sharing options...
+Ksarul Posted June 16, 2018 Share Posted June 16, 2018 There is also a schematic for the BWG controller in the Schematics thread. . .one that allow you to blow it up to any size you need without losing resolution. Quote Link to comment Share on other sites More sharing options...
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