UMDK Manufacture: who wants one?

Hosted forum for UMDK related questions

Moderators: BigEvilCorporation, prophet36

BigEvilCorporation
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Post by BigEvilCorporation » Tue Aug 12, 2014 1:27 pm

Please put me down :) This gets me very, very excited!
A blog of my Megadrive programming adventures: http://www.bigevilcorporation.co.uk

Artemio
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Post by Artemio » Tue Aug 12, 2014 2:21 pm

I am in with one, this sounds great.

MintyTheCat
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Post by MintyTheCat » Tue Aug 12, 2014 2:43 pm

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MintyTheCat
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Post by MintyTheCat » Tue Aug 12, 2014 3:04 pm

I will not support this site any longer due to site censorship.
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Stef
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Post by Stef » Tue Aug 12, 2014 3:21 pm

MintyTheCat wrote:
Stef wrote:Of course i would love to have one (or two) =)
Good to hear. It would help you a lot which would only be fed back into helping the MD Community through your work on SGDK.

Btw: I just saw your post on the SFII Driver - good.
I have never written any Sound-Driver for the YM2612 but I shall perhaps start by looking at your work on SFII when I get to sound - cheers.

Does that take us up to 8+5?
It would really save me a lot of time to have one of those, definitely :)
About the SFII sound driver, you had better to look into the SGDK ones... more powerfuls and better designed. I just wanted to fix the horrible PCM playback in this game and it's on the way but i believe the code is not really nice to look at...

MintyTheCat
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Post by MintyTheCat » Tue Aug 12, 2014 6:30 pm

I will not support this site any longer due to site censorship.
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prophet36
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Post by prophet36 » Tue Aug 12, 2014 6:54 pm

There is no facility currently to debug Z80 with breakpoints, etc. Such a thing may be possible but I personally concentrated on the 68000. There are some games where the music stops when the 68000 hits a breakpoint (I guess where the 68K is feeding the Z80 with notes to play), and there are others where the music just carries on merrily, where the Z80 is doing its own sequencing.

Mask of Destiny
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Post by Mask of Destiny » Tue Aug 12, 2014 7:01 pm

prophet36 wrote:There is no facility currently to debug Z80 with breakpoints, etc. Such a thing may be possible but I personally concentrated on the 68000. There are some games where the music stops when the 68000 hits a breakpoint (I guess where the 68K is feeding the Z80 with notes to play), and there are others where the music just carries on merrily, where the Z80 is doing its own sequencing.
There are a fair number of games in which the music runs completely on the 68K with the Z80 only used for playing back samples if it's used at all. That's probably what you're seeing there.

MintyTheCat
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Post by MintyTheCat » Tue Aug 12, 2014 7:31 pm

I will not support this site any longer due to site censorship.
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prophet36
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Post by prophet36 » Wed Aug 13, 2014 1:39 am

It's not a question of available resources in the FPGA (although I suspect there are plenty remaining). It's a question of whether a mechanism actually exists that can be used to implement breakpoints and single-stepping on the Z80, given that the available channel into the MD is what's on the cart slot. I can imagine some kind of indirect system using the 68000 as a proxy, but whichever way you look at it, it's going to be nontrivial work. Also, IIRC there is no Z80 GDB target, so all the GDB stuff we get for free with the 68000 won't be there. And I imagine it would be pretty hard to find a general solution to the problem of where to locate the necessary Z80 monitor code, since all 64KiB of the address space is available for use.

BigEvilCorporation
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Post by BigEvilCorporation » Wed Aug 13, 2014 8:16 am

MintyTheCat wrote:
BigEvilCorporation wrote:Please put me down :) This gets me very, very excited!
Are you still working on the MD, Matt?

I have not looked at any of your Blog entries for a while but have you done any more on the sound or anything else?
Yep, still on it, just haven't typed up anything about it in a while. I'm sure with a working UMDK that will all change ;)
A blog of my Megadrive programming adventures: http://www.bigevilcorporation.co.uk

sirmorris
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Post by sirmorris » Wed Aug 13, 2014 8:24 am

I have contacted Stefan and he is up for helping out. I will supply him with the gerbers and BOM and he will come up with an estimated price. He is on holiday until Sept. 8th (Nice to have your own business, eh?!), but I've PM'd him to ask for direct contact details which I will pass on to you, Minty.

I think it looks like we'll be in for a minimum of 20. My UK contact would have been good for 4 < N < 10 but I'll ask anyway.

MintyTheCat
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Post by MintyTheCat » Wed Aug 13, 2014 9:58 am

I will not support this site any longer due to site censorship.
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MintyTheCat
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Post by MintyTheCat » Wed Aug 13, 2014 10:11 am

I will not support this site any longer due to site censorship.
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Helder
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Post by Helder » Thu Aug 14, 2014 2:50 pm

I just ordered 10 pcbs for myself and another person and it cost me $148.05 through Hackvana. The Components I got through Aliexpress which cost $254 to get components for 10 boards (this didn't include Resistors and caps and transistors since I have those). The good thing about the order is that I have enough parts to make a few more batches and will only need to order a few IC's since many of the items I bought came in a large quantity. Basically what I'm saying is that you need somewhere around $300 for 20 boards unless hackvana gives you a deal, and around another $400 for the components and only reason I say this is that 10 FPGA's cost me $81 and you will likely need 20 so double that price.

I gonna be putting them together this weekend for myself and if all goes well I can sell off a few like perhaps 3. If you want a list of the people I bought from on Aliexpress send me a PM as I looked all over Digikey and other similar distributors and it was ultimately cheaper through Aliexpress ( you just have to wait 2-3 weeks for everything to arrive)

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