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Author Topic: MiniMig with AGA  (Read 317402 times)

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Offline mikej

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Re: MiniMig with AGA
« Reply #659 from previous page: September 30, 2010, 11:02:57 AM »
Not quite. The board has a high quality Wolson DAC (WM8729) with a decent analogue supply. This supports 192KHz at 24 bit audio.

The core is modified to drive the DAC, and will be expanded later for more bit-depth hopefully.
Mike
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Offline TheGoose

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Re: MiniMig with AGA
« Reply #660 on: September 30, 2010, 06:39:16 PM »
Ok, that sounds like some audio love, hope it works out good.
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Offline NovaCoder

Re: MiniMig with AGA
« Reply #661 on: October 01, 2010, 01:25:09 AM »
Quote from: mikej;582052
Not quite. The board has a high quality Wolson DAC (WM8729) with a decent analogue supply. This supports 192KHz at 24 bit audio..
Mike


Mmm a 24bit Paula to go with the new chunky and HAM10 modes would be lovely.

Then all we need is someone to hack (patch) the OS to take advantage of the updated hardware features ;)

I know, I know......one day.
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Offline minator

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Re: MiniMig with AGA
« Reply #662 on: October 01, 2010, 01:46:58 AM »
Quote from: mikej;582052
Not quite. The board has a high quality Wolson DAC (WM8729) with a decent analogue supply. This supports 192KHz at 24 bit audio.

The core is modified to drive the DAC, and will be expanded later for more bit-depth hopefully.
Mike



I'm wondering how will this compare with the original.

I don't know exactly how Commodore did it but I assume the Amiga had 4 DACs.  However these were not fixed frequency, they would have ran at the frequency of the sampling output which was variable.  Then there's analogue effects of the output and any filtering to consider.

How are you getting around that?
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Offline mikej

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Re: MiniMig with AGA
« Reply #663 on: October 01, 2010, 08:44:33 AM »
Essentially we model the analog mixing and filtering digitially in the FPGA now. For now, the four outputs are multiplied together, a simple low pass digital filter applied and then clocked out to the DAC at a fixed sampling frequency.

You can stop and start the data clock to the DAC, so I can send a new sample whenever the Amiga values are updated - so we can approximate the timing of the original DAC.

This will be something which is improved over time, both in new features and more closely emulating the original output.
/Mike
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Offline mikej

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Re: MiniMig with AGA
« Reply #664 on: October 05, 2010, 09:53:46 PM »
The PCB assembler just sent me this :

"I am actually preparing the setup on the pick&place tonight. It's almost done, as I have all the component packages in the vision library already. So when I get the packet with the components,  I'll be ready to load the feeders and start the production. From the  optimization process, it looks like approx 6 minutes assembly per board, on the slowest of my machines. I will most likely run the boards on friday, and I will shoot a little video of the process"

The components seem to be taking quite a while to get there, but hopefully tomorrow.
I'll post a video of the assembly when I get it.

/Mike
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Offline the_leander

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Re: MiniMig with AGA
« Reply #665 on: October 05, 2010, 09:57:45 PM »


Looking forward to seeing the results :)
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Offline Darrin

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Re: MiniMig with AGA
« Reply #666 on: October 05, 2010, 11:31:03 PM »
Quote from: mikej;583107
The PCB assembler just sent me this :

"I am actually preparing the setup on the pick&place tonight. It's almost done, as I have all the component packages in the vision library already. So when I get the packet with the components,  I'll be ready to load the feeders and start the production. From the  optimization process, it looks like approx 6 minutes assembly per board, on the slowest of my machines. I will most likely run the boards on friday, and I will shoot a little video of the process"

The components seem to be taking quite a while to get there, but hopefully tomorrow.
I'll post a video of the assembly when I get it.

/Mike


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Offline logikstate

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Re: MiniMig with AGA
« Reply #667 on: October 07, 2010, 11:14:04 AM »
Whoohoo!

Is it Friday yet? ;)
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Offline wizard66

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Re: MiniMig with AGA
« Reply #668 on: October 07, 2010, 03:49:37 PM »
Nice Going looks like the boards are comming to live this week ;-)
I hope the production run of the first 10 boards go without any problems.
My cash is burning a hole in my pocket, I realy look forward to this board.
Keep up the good work MikeJ...
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Offline Hattig

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Re: MiniMig with AGA
« Reply #669 on: October 07, 2010, 04:31:31 PM »
Best of luck with this! It's getting to the exciting stage. Looking forward to the photos of the board running something AGA!
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Offline Greg.0

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Re: MiniMig with AGA
« Reply #670 on: October 07, 2010, 05:03:05 PM »
It's really impressive to see a video of the assembly. I remember that for the 1541 Ultimate of Gideon Z.
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Offline mikej

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Re: MiniMig with AGA
« Reply #671 on: October 07, 2010, 08:00:04 PM »
Everything has arrived at the production site, so they should be built tomorrow...
Mike
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Offline RMK305

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Re: MiniMig with AGA
« Reply #672 on: October 07, 2010, 08:46:52 PM »
Great news. I look forward to seeing these board running. Just out of interest, what has the response been like from other communities? This now feels more like an Amiga product than anything else.
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Offline mikej

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Re: MiniMig with AGA
« Reply #673 on: October 07, 2010, 08:51:12 PM »
I do post here more than other groups, but the interest has been high from the Atari and arcade game bunch as well.

oh, If you haven't been yet, visit my mates page
http://www.harryfew.com

I put a link on the fpgaarcade page and he is very excited to go from 2 hits a month to hundreds a day :)

He lives in China and is helping me with sourcing there.
/Mike
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Offline Darrin

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Re: MiniMig with AGA
« Reply #674 on: October 07, 2010, 08:58:26 PM »
Quote from: mikej;583466
I do post here more than other groups, but the interest has been high from the Atari and arcade game bunch as well.

oh, If you haven't been yet, visit my mates page
http://www.harryfew.com

I put a link on the fpgaarcade page and he is very excited to go from 2 hits a month to hundreds a day :)

He lives in China and is helping me with sourcing there.
/Mike


One thing we keep forgetting is the other cores that will be available/developed.  What's the situation with them?

(I've given Harry another hit)  :)
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