Custom-built multi-bank Roland M-256/M-512 memory cards

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bassman4d521
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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by bassman4d521 » Thu Jun 25, 2015 10:01 pm

Another VG8EX user here that would definitely buy one!

6581Sound
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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by 6581Sound » Thu Jul 30, 2015 10:12 am

Great, this is an interesting project. I was looking for a roland memory card on the net, but would rather buy a new updated one instead of a used one of course. As owner of Roland D50 and Roland R8, I'd like to buy two M-256 cards if that is possible.

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by dojoe » Thu Jul 30, 2015 12:02 pm

Quick update -- oof, has it really been two months already?! Here's what I've been up to lately:

Image

That's Zaichornok's GC-8 sitting on my workbench -- he was having issues with the card that and friend and I could attribute to what appears like signal reflections at the card interface, causing intermittent fake write pulses that would slowly corrupt his card -- if you squint, you can almost make out the small yellow spike on the scope. Nothing a small capacitor at the right place can't fix =) This is a weird interaction between my card and the GC-8 specifically, and apparently none of the previous beta testers had any problems so far so they should be fine as long as they don't start using a GC-8 ;)

The remaining rev.B cards will be shipped with filtering capacitors botched onto the control signals, and I will eventually layout a rev.C (but I'll wait for feedback about the remaining rev.B cards first) and go though another prototype run of these before I think about mass production.

I have also gotten word from my parts supplier -- they will take back the bent ICs and I will be refunded, so I can order new ones. So I should be able to complete the remaining rev.B cards soon and send them out to beta testers.

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by SoundWerx » Thu Jul 30, 2015 11:56 pm

Thanks for the update :)

Anarkand
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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by Anarkand » Sat Aug 01, 2015 6:04 am

Wow that sounds real good :) let me know if you need testing. All the best from Denmark

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by martin8or » Sat Aug 15, 2015 10:18 am

I tried to do this myself and didn't get it working properly, was using a GC-8 for testing too which might explain why.

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by localhero » Sun Aug 30, 2015 11:13 am

Hi everybody,

I have received the multi bank memory card yesterday (thanks Joachim !).
It's a 16 banks of 256 Kbit each, so 1024 patches storage available :D

Very nice looking card. At the beginning it didn't want to be inserted in the JD990.
I didn't want to force and to break something, but I have tried again and this time the card was inserted.

Then I have sent some sysex files from my computer to the JD. And then saved the internal patches received to the card.
No problem. Next try was to switch banks and fill several banks from different sysex files.

I have filled 4 banks, the 4 JD banks with all the patches for the Vintage expansion card (as explained here http://www.donsolaris.com/?tag=roland-jd-990).

It works perfectly :) :) :)

A very happy user.
I can sell my old M256 original card now.

I will try the card in my Roland D5 when I will find time (the D5 is not plugged for the moment).

Happy sunday to you all and a big thank you to Joachim for the hard work :P
David

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by madtheory » Sun Aug 30, 2015 1:00 pm

Great news! :)

aladan
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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by aladan » Sun Aug 30, 2015 11:16 pm

localhero wrote:I have received the multi bank memory card yesterday (thanks Joachim !).
I think you must be a beta tester (like me). I don't think the cards are officially available for sale yet, until it is confirmed they work properly in all machines.

Cheers,
A.

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by dojoe » Mon Aug 31, 2015 9:54 am

aladan wrote: I think you must be a beta tester (like me). I don't think the cards are officially available for sale yet, until it is confirmed they work properly in all machines.
That is correct. I am currently hand-picking beta testers based on the hardware they have so I can maximise test coverage for the cards. I sent a card to aladan and localhero so far, still waiting on responses from Marpytoys and Headless68. It's vacation time right now, so I'm not expecting quick responses at the moment ;)

Very much looking forward to hearing of your experiences with your many synths, aladan =)

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by gj67 » Tue Sep 01, 2015 3:13 pm

Hi Joachim,

If you need any testing done on a Roland D70, let me know and I can arrange this for you. (I actually own 2 of them)

Kind regards,
GJ.
Roland D70 - Roland Integra 7

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by dojoe » Tue Sep 01, 2015 10:57 pm

gj67 wrote: If you need any testing done on a Roland D70, let me know and I can arrange this for you.
Thanks for the offer, but I got the D70 angle covered already.

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by baz99 » Wed Sep 02, 2015 12:58 am

localhero wrote: Very nice looking card. At the beginning it didn't want to be inserted in the JD990.
I didn't want to force and to break something, but I have tried again and this time the card was inserted.
Yes, insertion and extraction can be a bit difficult as the Roland card slots are so slim.

Roland used raw chips without any plastic casing inside their cards to make the chips fit in these slim cards (I opened up an original Roland card, that's why I know this). This is something dojoe obviously can't do so he has to work with the size of the standard commercially available chips. I don't think there is any way dojoe could have made the cards any slimmer.

Luckly dojoe's cards with the standard chips are just about slim enough to fit in the slot but it's a tight fit, so insertion and extraction has to be done carefully.

For me this is not a problem as with the 8 banks of 64K available on a single card (or 16 banks of 32K) I don't need to ever swap out the card, one card provides all the storage space I will ever need in my JV-1080. 8-)

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by localhero » Wed Sep 02, 2015 5:13 pm

baz99 wrote:
localhero wrote: Very nice looking card. At the beginning it didn't want to be inserted in the JD990.
I didn't want to force and to break something, but I have tried again and this time the card was inserted.
Yes, insertion and extraction can be a bit difficult as the Roland card slots are so slim.
Yes, as a beta tester I was reporting my first impressions, trying to avoid any damage to the lovely card. But the second try was good, no problem at all.
baz99 wrote: For me this is not a problem as with the 8 banks of 64K available on a single card (or 16 banks of 32K) I don't need to ever swap out the card, one card provides all the storage space I will ever need in my JV-1080. 8-)
I totally agree, once inserted I think I won't need to pull the card, with these 16 banks. 16 cards is enough :D

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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by ʝɵʝɵ » Thu Sep 03, 2015 2:08 am

baz99 wrote:Luckly dojoe's cards with the standard chips are just about slim enough to fit in the slot but it's a tight fit, so insertion and extraction has to be done carefully.
It's worth noting that as with all other dimensions of the cards (just remember that the original revision was designed to be a few cm shorter!), this varies from synth to synth though. On the D-50, the card sits rather loosely in the slot, for example.

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