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

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

Post by Evil Dragon » Thu Feb 18, 2016 12:16 pm

I am definitely interested in one card with 16 banks for my JD-990! :)


(Came here from Gearslutz, where this project was mentioned.)

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

Post by gj67 » Thu Feb 18, 2016 11:15 pm

Well...I did already give up on this as my Christmas present but perhapse a birthday present (May) would be possible? :D
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Re: Custom-built multi-bank Roland M-256/M-512 memory cards

Post by ʝɵʝɵ » Thu Feb 18, 2016 11:18 pm

If anything, rather hope for a Christmas present. As said on the previous page, dojoe ordered the first Revision C boards, and they first need to be tested. Hopefully we can conclude from this test that the card is good to go, but don't expect that to happen before May.

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

Post by dojoe » Sun Feb 28, 2016 3:17 pm

I'll just leave this here:
Image

My test jig is currently at madtheory's place, so I can't test the functionality, but electrically the two cards I built seem fine. I'll probably have eight cards to hand out this time; I'll build them over the next weeks.

I made one more small experimental mod for Akai compatibility that I'm going to send to madtheory if he agrees, and once I get my test jig back I can start testing cards and sending them out to some more hand-picked testers.

EDIT: Small changelog:
  • The tip of the card is a teensy bit wider now, and finally doesn't wiggle inside the slot any more :mrgreen:
  • MRAM chip moved a centimeter-ish towards the switches so that the cards don't get stuck in JV slots
  • Filters on the three control signals that should hopefully eliminate the spikes that caused Zaichornok trouble
  • Akai compatibility
  • Even nicer board design and sex-ay image on the back 8-)

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

Post by wjmwpg » Sun Feb 28, 2016 3:48 pm

Lookin' dade sexeh!

Can't wait for general availability.

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

Post by baz99 » Mon Feb 29, 2016 2:11 am

dojoe wrote: [*] The tip of the card is a teensy bit wider now, and finally doesn't wiggle inside the slot any more :mrgreen:
My Rev. B does not wiggle at all, it sits rock solid when inserted in the slot, presumably this was a problem in a different synth, not the JV-1080?

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

Post by ʝɵʝɵ » Mon Feb 29, 2016 2:23 am

The original rev. A does wiggle a bit in the D-50 I think, but nothing too bad. Sometimes it moves a bit when I remove the protection cover on my synth so the card is not recognized anymore, but simply moving it a bit around solves that issue for me.

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

Post by dojoe » Mon Feb 29, 2016 10:59 am

baz99 wrote:My Rev. B does not wiggle at all, it sits rock solid when inserted in the slot, presumably this was a problem in a different synth, not the JV-1080?
I've had reports of this for Zaichornok's GC-8 and madtheory's Akai keyboard, if I remember correctly. Just a smidgen, but enough to bother me. I actually ordered myself a bare D-50 slot assembly now to improve my test jig, and the RevC card fits in there snugly. No wiggling, no shearing off of plastic parts ;)
ʝɵʝɵ wrote:The original rev. A does wiggle a bit in the D-50 I think, but nothing too bad.
That's because the "original" RevA had no slimming at all and was trimmed down by hand, eyeballing the necessary width ;)

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

Post by SoundWerx » Thu Mar 03, 2016 6:44 pm

Very nice :D Have you done any more research into using a re-flow station for producing these? I'd imagine you're still producing each by hand but I suspect you're going to be able to sell several hundred when the design is finalised :D

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

Post by dojoe » Thu Mar 03, 2016 9:10 pm

SoundWerx wrote:Have you done any more research into using a re-flow station for producing these?
Trust me, once this gets out of beta phase, I have zero intention of soldering a single joint myself ;) I'm going to go with a professional assembly house -- costs money but saves nerves :D

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

Post by SoundWerx » Thu Mar 03, 2016 9:22 pm

Heh, somehow I thought you were going to say that :D smart move!! ;)

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

Post by Robert_M » Fri Mar 04, 2016 7:12 pm

I just signed up to the forum specifically to follow this thread and get in the queue when these are ready for sale/shipment.

I have a JV-880 that could use a data card, and this looks like the best way to go. The graphics look fantastic and, as someone who has a few Raspberry Pi boards kicking around, I kinda like the "unplugged" look of a card without a sleeve.

Looking really great so far!

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

Post by Anarkand » Sun Mar 06, 2016 10:55 am

Nice work. I volunteer for testing duty :) live in Denmark.

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

Post by V3nom » Wed Mar 09, 2016 4:33 pm

Hi,

I've been following this site for almost a year. You two are making a great job.

As owner of Roland JV-880, Roland GR-50 and Peavey Tubefex, all of them open mouthed for M256 card ;) , I'm patiently waiting for the final result.

Meanwhile, as I have one SRAM left from Tubefex when I change it with nvRAM, I've replicated memory card following the linked schematics. Everything is working fine on all three machines.

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

Post by ʝɵʝɵ » Wed Mar 09, 2016 5:26 pm

In the meanwhile, I had the chance to test a rev.C card in my D-50, and it still works as expected! :)

V3nom, nice to hear that rebuilding the original card worked for you. Since you asked this in private and I didn't put a warning when linking to the original schematics, I think I should post this here in case anyone else is going to build their own cards in the future: The linked schematics on page one claim that the card contacs should be 1.27mm apart, but 1.5mm seems to be a more realistic value - otherwise the card won't work at all. :)

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