No updates to report yet :(
But now I have had but experiences with the level translators, and is going to continue this design with 5V stuff. You will take a fair while just to get the regular ROM connected up and working. But if doing the new board, I would want to put fast ram on there as well..
Though back to the point that the SRAM is about £10 per MB. This will give up to 50MHz fast-ram speeds. There are of course the maximum would generally be 8MB (£80) though I have suggested 10MB or 12MB before, but I think there was some problem with possible conflict with external graphics RAM or something..
So I will probably add on space for 8 chips for now.. Then they can be populated in 1MB steps. Likely I would only fit 1MB for testing purposes anyway. Cheaper to kill 1 chip than 8 :)
Really I just want to discontinue the V2.2 booster, and get this current design and running as it is the V2.2's successor. Of course I want to not just ramp up the speed, but add the new to it like the long-awaited fast ram. I have of course considered adding flash ROM, and and even IDE, but each new feature could take several months to test and debug individually. The trying to bring up everything on one card at once, is not really realistic to do.
Of course this project has been on hold for some months again, but I hope in the New Year I can spend bit more time on this again. Of course wiring up ROM & RAM really only comes down to PCB routing time. There is the firmware as well, but that should really be pretty simple to do as well.
Incidentally I do actually have 2 of the SEC prototypes somewhere which if anyone wants to purchase one, I will try and find them flash the firmware into them.. It is just the 50MHz CPU running... Benchmarks here...
https://www.exxosforum.co.uk/forum/viewt ... =160#p6266 Not terribly exciting to say the least...