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Re: Gryphon 68030 [message #768 is a reply to message #767] Fri, 10 June 2016 10:46 Go to previous messageGo to previous message
yoda is currently offline  yoda
Messages: 125
Registered: October 2015
Location: Cedar Rapids, IA
Senior Member
Hi Andrew,

I know we have talked privately about the board but might as well get some feed back in the open. I have to ask what is the final end game here? As it stands, the 1.1 version still has some issues in stability - maybe the updates will make it better as there were quite a few soft wires on the board. I fear the 1.1 board may be of limited use/interest. The small memory support is a problem and ROM mapped at address 0 will cause some problems (that can be over come). The video was never able to be checked because the foot print did not match the chip (rotated 90 degrees if I recall) I tried make a wiring jig for it and could not get it to communicate so there may be more issues there. The network interface has never been checked either. Both of these chips are fairly dense pin SMT devices which will not appeal to the casual hobbyist to solder. There are some very good design innovations in the board that should be carried forward but I am not sure making a replica of the original design is where we would want to start from. I think a subset would be better (a core with an I/O board add on). As you know I spent a lot of time with Paul on the bring up of this board and we got pretty far but I don't want to speak for Paul but I think we had agreed that 1.1 would be somewhat different that 1.0. I am pretty sure that the schematics would be a whole lot different and would have to be re-done (unless you have isolated things to separate sheets - not sure how much rework would occur even in that mode). Of course you know I am very interested in this so I guess a schematic is a good place to start from but I am just saying I don't think the final schematic is going to look anything like the 1.1 schematic. I just don't want to cause a lot of extra work. Again it is all about what is the end game. I would like to see a board that can run multi-user linux in the end so have a display, keyboard, and sound is not a high requirement for me initially which simplifies the board and board area significantly. Also I would like to use an Altera CPLD or two, to consolidate the GALs which would simplify the board layout and the patch work that happened in the other GALs as changes were made.

Dave
 
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