cofford Posted February 28 Report Share Posted February 28 Anyone interested in developing a 68040 PDS card for a IIfx? I realize this would require replacing a chip on the logic board as well. I'd be happy to help in any way I can! Quote Link to post Share on other sites
olePigeon Posted February 28 Report Share Posted February 28 (edited) PM @Bolle. I was literally just talking to him about it. It will likely require someone lending an actual TokaMac so it can be reverse engineered. The problem is that they're really, really rare. I know that former engineer and co-founder of Fusion Data Systems used to run a mailing list for TokaMac owners. The website has since gone down, but there's still an email on Archive.org. I don't know if he owns or works at the company that hosted the page. It'd be worth contacting him. Maybe he still has the original schematics and/or code for the GAL that needs replacing. https://web.archive.org/web/20100102195041/http://www.ddg.com/TokaMac/index.html Edited February 28 by olePigeon Quote Link to post Share on other sites
ArmorAlley Posted February 28 Report Share Posted February 28 Would it only work with 40MHz 68040s or can the bus-speed be set by the PDS slot? Are there so many free 40MHz 68040s in the wild to make this a viable project? Quote Link to post Share on other sites
68kMLA Supporter Bolle Posted February 28 68kMLA Supporter Report Share Posted February 28 (edited) 19 hours ago, olePigeon said: Maybe he still has the original schematics and/or code for the GAL that needs replacing. I seem to remember I read somewhere that he doesn't has any of that kind of information anymore. Also as @olePigeon already said... Send me a Tokamak and the GAL they put on the logicboard and I'll make schematics and GAL/ROM/FPGA dumps available (and build a few reproductions) Edited February 28 by Bolle Quote Link to post Share on other sites
olePigeon Posted February 28 Report Share Posted February 28 (edited) @ArmorAlley Dunno, but Bolle's current clones just have sockets. The card is the important part. 68040s can be sourced in a number of different ways (or just borrowed from another computer you own.) You can also play the AliBaba lottery and hope to get a full 040. Edited February 28 by olePigeon Quote Link to post Share on other sites
68kMLA Supporter nickpunt Posted March 31 68kMLA Supporter Report Share Posted March 31 FYI @cofford @Bolle this 68040/33 accelerator is from Donoho Design Group, which would suggest it is related to / is part of the Tokamak II FX (according to DDG's website). https://www.ebay.com/itm/VINTAGE-CARD-by-Donoho-Design-FOR-APPLE-MAC-COMPUTER/274740925739?hash=item3ff7d5d52b:g:z-sAAOSwLOpgZMO5 Quote Link to post Share on other sites
68kMLA Supporter nickpunt Posted March 31 68kMLA Supporter Report Share Posted March 31 Well looks like I'm wrong, that card is the same as the Presto 040 by Sonnet according to this thread where a Tokamak is mentioned which shows the board using the IIfx special extended slot (attached images, since who knows when Google Photos will be discontinued). Quote Link to post Share on other sites
68kMLA Supporter Daniël Posted March 31 68kMLA Supporter Report Share Posted March 31 23 hours ago, nickpunt said: FYI @cofford @Bolle this 68040/33 accelerator is from Donoho Design Group, which would suggest it is related to / is part of the Tokamak II FX (according to DDG's website). https://www.ebay.com/itm/VINTAGE-CARD-by-Donoho-Design-FOR-APPLE-MAC-COMPUTER/274740925739?hash=item3ff7d5d52b:g:z-sAAOSwLOpgZMO5 This is indeed the same as the Sonnet Presto 040. Not sure what the story is, I'm guessing DDG designed it and Sonnet licensed/bought the design from them. For what it's worth, mine's currently at @Bolle in the hopes of getting it to work in an SE/30, but I'm more than fine if it's used for IIfx accelerator research, if it's non-destructive. Quote Link to post Share on other sites
68kMLA Supporter Bolle Posted March 31 68kMLA Supporter Report Share Posted March 31 I suspect the Presto040 (or whatever it was called under the Donoho brand) is the successor to the Tokamac SX made for the IIci. Btw: I contacted the person with the IIfx card from the thread linked above asking if they would send me the GAL from their logicboard and the accelerator to recreate everything. Didn't hear back from them though. Won't blame them though, having one of the few working Tokamac IIfx setups. Quote Link to post Share on other sites
olePigeon Posted April 1 Report Share Posted April 1 I also tried emailing the Tokamac engineer, but he didn't respond. Quote Link to post Share on other sites
Unknown_K Posted April 1 Report Share Posted April 1 23 hours ago, olePigeon said: I also tried emailing the Tokamac engineer, but he didn't respond. I had contact with Andrew W. Donoho back in 2005 and he didn't have any files saved for the ROM back then (just the driver software). Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.