MiniMig with AGA

[Crom00]

I think this is pretty neat
How about a more A600/A1200 style one?

Sure that sounds cool. The A600/1200 styling is cool becuase if you cast in CD32 gray color it works out nice. You get an extra option.

[kolla]

Well, if you add a CD-drive to the Replay you very much have a souped up CD32... oh man!

[Crom00]

Yep. The problem with these FPGA projects is that for cases it'd be best to just make them all ITX compliant.

What I've done in the past for console modding projects is take say an XBOX 1 motherboard and mount it on a thin piece of plexi that has the correct holes drilled for a miniATX case mount.

there are tons of nice and cheap HTPC cases out there on NEWEGG. Fo the cost of the HTPC case you still come in cheaper than what you would pay for a custom tooled case design like my A500 or 520ST style.

[mikej]

Very nice!
I'll be releasing the mechanicals shortly, so you can see if the board will fit.
/Mike

[TheDaddy]

I looked, wondering what was wrong with my browser, fired up the next browser, no... same thing. Ah, it's a game. Duh.

Have another look Kolla :-)

[Crom00]

Cool deal mike will draw all the port cutouts when I get it.

If anyone has any case suggestions please let me know.

[basman74]

If anyone has any case suggestions please let me know.

Would be nice to see a tiny floppy disk 'facia' sculpted around the SD card slot

Valentin

_______________________

My retro-computer project

[wizard66]

@Crom00,
Nice case, best looking case in years ;-) I'm in for one.
Gives that retro feeling one needs..

[Crom00]

@Crom00,
Nice case, best looking case in years ;-) I'm in for one.
Gives that retro feeling one needs..

You get it Wiz... that's the goal. It's all about that Warm and Fuzzy retro feeling.
Crack open a beer...(or milk and cookies) and play some games.

[trekiej]

I have an idea about making the cases.
You would need to RP 4 pieces and use Silicon Rubber and possibly mold release.

[andy9841]

How about one in black?

[mikej]

I just tried one of the RevA boards in a ATX case to check the hole alignement and the holes are in the right place, and the IO lines up.

So, should be good for mini-ITX box.
/Mike

[tasmanian guy]

I just tried one of the RevA boards in a ATX case to check the hole alignement and the holes are in the right place, and the IO lines up.
 
So, should be good for mini-ITX box.
/Mike

Excellent news Mike!

[Crom00]

I have an idea about making the cases.
You would need to RP 4 pieces and use Silicon Rubber and possibly mold release.

But you would need a pressure pot to blow out any air bubbles... Otherwise you get wierd bubbles on the surface that will need lots of cleanup.

For those of you that have ever collected unlicensced garage resin kits... they are notorious for cleanup. Lots of sanding priming and painting. Then when you're done you have a nice photoshoot mueseum piece prototype but it's good for little else. Think of a nicely painted model kit when you were a kid. Sure it's plastic and painted but would you play with it? no you put it on display.

Belive me I've been through the ringer. To get a clean plastic case you have to tool it (steel mold) Or RP it with the most expensive method. An ABS injection color case is better in that it holds up to everyday use.

[trekiej]

Please keep us posted on it. Maybe, a big maybe, we could take up a collection.
Maybe it is out of our range.

[Captain Case]

The memory bus of the Minimig runs at 7.09 MHz so it was the simplest solution. The CPU can access the bus every clock cycle if it's not used by the chipset DMA.


The 16-bit opcodes are executed one per clock cycle. The performance could be even better if the data bus was 32-bit wide.

 
According to timing analysis results both these cores can run up to 20 MHz on Spartan-3E. I will try to run the CPU twice the speed of the memory clock. And with a prefetch buffer to improve memory throughput.



24 MHz SPI, no DMA.

:rtfm: At 7.1 MHZ the bus speed would be 14.2 Mb/sec, or twice the speed of the A1200 chipmem bus: From that limitation, I wouldn't expect any significant performance gain over the current speeds. The Sysinfo speeds as indicated by Yacube  1.85..2,5 x A1200 correspond to that. Could a future Minimig AGA core perhaps take a bigger slice out of the 133 MHz DRAM bandwidth of the FPGA- replay board to allow for greater speeds (perhaps up to 68040-25 level) in the future?