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andym00
Registered: Jun 2009
Posts: 44 |
Ultimax unleashed..
Well, someone did what I've been wanting to do for some time.. Driving VIC fetches from external memory, and stuffing register writes over the bus.. Hooray for Ultimax mode I guess :)
Always wanted to build something like this, but kudos to Laurent for acutally getting there..
https://www.youtube.com/watch?v=yy4Gr11EXHM
He's got a few videos up of it in action.. Nothing ultra crazy, but proof it's all working..
https://www.youtube.com/channel/UCDfSVxlHK9AJHPRCoGqDYZQ |
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tlr
Registered: Sep 2003
Posts: 1714 |
Quote: i'd probably prefer some kind of fixed function pipeline that the C64 CPU can setup and use.... writing the payload in C for an ARM cpu just feels wrong :)
It feels weird to have the copper more powerful than the main cpu. :) |
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Krill
Registered: Apr 2002
Posts: 2839 |
Quoting tlrIt feels weird to have the copper more powerful than the main cpu. :) I guess it's very sensible to have the copper not be Turing complete. With that prerequisite, it's somewhat a question of perspective whether it's more powerful or not. |
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morphfrog
Registered: Mar 2002
Posts: 32 |
Quoting LaurentQuoting morphfrogCan you please tell us a little bit about the custom hardware you are useing for this? I have understand you use a external cpu in the cartport amongst others. 
(there are no components on the bottom side)
I used a multi-core ARM CPU, but for now i prefer not telling the exact part, i hope you won't mind :-P
Obviously the specs are outrageous compared to the 6510.
Still, one of the core had to be 'wasted' to solely handle the BUS, the GPIO speed was the bottleneck and barely allowed it.
It doesn't have much RAM, less than 512 KB. I believe with the firmware only about 400 KB will be left for the user.
I used a 8MBytes SPI Flash (the winbond part)
The components above the red line are not necessary for the cart to work, but nice to have for the dev version.
I populated a microSD slot for testing purpose, like you saw i ended up using the SD CARD to make these videos. Under the microSD slot (can't be seen) there is a footprint for a SD NAND flash chip.
The chip near the holes is a UART<->USB converter, most developers already have such converters on small breakaway boards, but i thought it would be nice to include it here.
The non-populated part on the right is for a small WIFI module based on the W600 chip.
Intresting thx for info! |
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