FPGA Replay Board

[mikej]

The main part of the Amiga core is Minimig derived, but rapidly diverging.
I have had some contact with Boing4000 and will incorporate any fixes which are common.
/Mike

[Casey4147]

Apple didn't have a problem with the emulation.  I demostrated it to Scully and others at their facility in Cupertino.  I was trying to get Apple to make ROMs available for sale (by them) to make it easier for emulations to be made.  Their only concern was compatibility and how it was perceived.  When I showed them the A4000 running circles around their Mac Quadras their concerns were centered around the fact the Amiga was a better architecture.    But, at no time did they ever attempt to stop what I was doing.

@JimDrew -

Oh, wow, you're THAT Jim Drew?  There's a name I hadn't heard of in a long time.  Really missing my Amiga days...

[denli]

I really like the new design of your web site, Mike

http://fpgaarcade.com/dev/drupal/

It just need some content, too.

[denli]

Is this ready for shipping now, Faranheit?

http://faranheit.dyndns.org:8080/FPGA%20Arcade/FPGA%20Arcade%20Boards%20and%20Accessories%20Prices%20List.pdf

[freqmax]

060/Ethernet/USB Daughter Board coming in 2012 !

Maybe not?

[Faranheit]

Hi;

Oups, effectively

Thanks for the notice, I'll change this.

For the moment, until Mike is 100% satisfied of his new firmware, no boards will be shipped, as he has said it before

It's overall for pre-orderers

Thanks, Faranheit

[mikej]

The main part of the Amiga core is Minimig derived, but rapidly diverging.
I have had some contact with Boing4000 and will incorporate any fixes which are common.
/Mike

I've merged in the latest changes (mainly audio fix) and I'll ship a board of to Boing4000 for development.
/MikeJ

[wawrzon]

@mikej:

I've merged in the latest changes (mainly audio fix) and I'll ship a board of to Boing4000 for development.

great! will be following what boing will have to report on a1k!

meanwhile have you heard of this attempted italian fpga project:
http://www.tinaproject.it/
http://forum.tinaproject.it/

admittedly it doesnt look like much yet, but ive heard the guy behind it has a company that is going to carry part of the designing and manufacturing effort as a side project of a design they are working on anyway. ive been told they tried to contact you. i know there is both sides to that coin. still if its serious and some cooperative appointment profitable for both sides and the community could be found it would be worth a try. i proposed they might provide an fpgaarcade daughter board for a faster fpga core, which though isnt exactly the thing they are interested in i guess. i dont know, but maybe sharing 68k-emu and chipset-emu code could be of value. just a thought.

btw cesare di mauro accused of criticism towards os4 and ppc in this quarrel thread and responding there is apparently going to be involved with that tina project:
http://amigaworld.net/modules/newbb/viewtopic.php?mode=viewtopic&topic_id=37178&forum=33&start=0&viewmode=flat&order=0
i recommend this lecture only after work!! dont get side tracked.

[JimDrew]

@JimDrew -

Oh, wow, you're THAT Jim Drew?  There's a name I hadn't heard of in a long time.  Really missing my Amiga days...

LOL.... yep, it's me.. and I am back into producing new (and some old) products for Commodore computers.  I am looking forward to doing some FPGA work too.

[NorthWay]

If I have asked this already then nvm, but:
Has the board been designed for easy and frequent FPGA updates? I'd rather not be a disc-jockey (card-jockey?) if I ever try developing something. Thx.

[yaqube]

I've merged in the latest changes (mainly audio fix)

Mike, what was the problem with audio?

[mikej]

In audio.v
Changelog:
"//              Silences audio channel when replen is 1 - fix for Gods jump noise."
I haven't verified the fault or fix yet. The link to the code is posted slightly earlier in this thread.
I'm going to send you a complete WIP snapshot as soon as it is stable.
Cheers,
Mike

[gaula92]

The problem was that, in GODS, certain sound effects left a high pitch sound playing after they finished. It also happened in other games.
MMrobinsonb5 from http://www.retroramblings.net fixed it. It was supposed to be a temporal fix until a better sigma-delta filter was implemented.
More on it here:

http://minimig.net/viewtopic.php?f=7&t=516

It's a long thread, but the last pages have very good information on the problem.

[mikej]

The problem was that, in GODS, certain sound effects left a high pitch sound playing after they finished. It also happened in other games.
MMrobinsonb5 from http://www.retroramblings.net fixed it. It was supposed to be a temporal fix until a better sigma-delta filter was implemented.
More on it here:

http://minimig.net/viewtopic.php?f=7&t=516

It's a long thread, but the last pages have very good information on the problem.

Thanks for that, very useful.
The Replay core may not suffer this problem, we have a 24bit DAC hanging off the FPGA. If the error is a result of the delta-sigma converter then I won't see it.
I'll run some simulations and see if the silence change is necessary.
Boing can run some tests on the Replay core when he gets the board.
Best,
Mike

[Darrin]

I've merged in the latest changes (mainly audio fix) and I'll ship a board of to Boing4000 for development.
/MikeJ

Does that mean the rest of us beta board users can expect a new core to play with?  I'm off work in a week and I'll have 7 days off... hint, hint.  

[mikej]

I really hope so...