Search found 110 matches

by dojoe
Thu Jan 16, 2020 10:50 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

Avro_Arrow wrote:
Thu Jan 16, 2020 1:21 am
I'm a wimp, I know.
But you also opt out of a buttload of headaches ;)

Good luck with your project, let us know how it goes!
by dojoe
Tue Jan 14, 2020 4:54 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

Hah, yeah, the 16A won't do you much good :) The D-50 uses 256kbit, i.e. 32kbyte, so that's A0 thru A14. Our card uses a 4mbit chip and supplies A15 thru A18 from the slide switches. Note that ordering the address bits in this way is not really necessary - you can freely rearrange address bits as yo...
by dojoe
Tue Jan 14, 2020 2:33 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

More precisely, we have two SP4T slide switches on the card. For each of those, the 1 position is left open, and the 2, 3, 4 positions have separate lines attached to them. The switch common is attached to VDD and each of the three lines is individually pulled to GND via a 10k resistor array. This g...
by dojoe
Wed May 15, 2019 10:40 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

Curious, are these cards also capable of being used to replace PCM cards? Or only the data cards? Forgive me if this is a stupid question or has been answered already. Not stupid at all :) It's been asked before but it's hidden deep inside the bowels of this thread ;) The cards can be used for PCM ...
by dojoe
Sun May 12, 2019 11:05 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

New MRAM cards in stock!

I've got good news and bad news! The good news is: We've got new stock of 140ish cards! :mrgreen: The bad news is: Due to a computer mishap (we blame PHP!) we lost all your pre-registrations so we can't send you an email to tell you about the good news :( So if you're reading this, go and place you...
by dojoe
Mon Dec 31, 2018 2:17 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

Is W/E only a command line from D-50 to card, and M/R the line which tells to the synth the card is protected ( as it was told somewhere on this post ) ? The WE/CE/OE lines are control lines from the synth to the RAM chip - it's a typical SRAM interface, even though the polarity of CE is reversed c...
by dojoe
Thu Dec 13, 2018 6:32 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

I have a Roland VG-8 Expanded and I'm interested in helping you make the card compatible with this unit. Are you still interested? It would certainly be technically interesting, but I don't have the time any more to spend on fully figuring the VG problem out, changing the card layout and going thro...
by dojoe
Thu Oct 11, 2018 8:28 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

Re: And we are live!

shipping will be between 5€ and 40€ depending on where you are and whether you want insured shipping. Good news! We found (as in "were pointed to") a much cheaper shipping option so we can offer worldwide shipping with tracking and insurance for 10€! The 5€ option without tracking and insurance wil...
by dojoe
Sun Oct 07, 2018 2:49 pm
Forum: Gear Services & Other Goods
Topic: DIY Kurzweil K2500 P/RAM expansion boards - any takers?
Replies: 0
Views: 3242

DIY Kurzweil K2500 P/RAM expansion boards - any takers?

Howdy, so as jojo already mentioned I made a parameter RAM expansion module compatible with the Kurzweil K2500 because we didn't think people should have to pay upwards of 100$ for an extension that's 10 bucks worth of parts at today's technology. I just open-sourced that card today - check out the ...
by dojoe
Sun Sep 30, 2018 10:17 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

And we are live!

Once I've got enough stock of completed cards, I can start taking orders -- around the end of September maybe? Quite literally so - 50 minutes to the end of September to be precise! :lol: We are taking orders again! I have 93 cards tested and ready to ship, with another 50 almost done. Hop on over ...
by dojoe
Tue Sep 04, 2018 1:15 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

New batch in the making!

Look what came in the mail today: http://dojoe.net/images/mr-batch2-assembled.jpg 168 memory cards, assembled but still on panels. I'll have to find the time now to perform the final assembly steps (break the cards out of their panels, add guard wires to protect the slide switches, configure the car...
by dojoe
Thu Aug 23, 2018 8:11 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

There's another batch of cards in the pipeline at the moment, but as jojo pointed out, we cannot give you any dates yet. Don't spend all your money on other things yet though ;)
by dojoe
Thu Dec 07, 2017 7:32 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

DANKE SCHOEN, dojoe and ʝɵʝɵ, for all your hard work in making this happen! I bought my D-50 earlier this year and hoped to get a multi-bank RAM card, and just found out about your years-long effort, so this was perfect timing! Hey, glad you got it and it's making you a happy camper! :D (and the na...
by dojoe
Tue Nov 21, 2017 1:16 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

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

Evil Dragon wrote:I actually inserted it the wrong way the first few times
I knew I should have added some text "This side up" on the card :lol:
Evil Dragon wrote:Happy camper here!
And here too :D Glad it's working for you!
by dojoe
Mon Nov 20, 2017 8:52 pm
Forum: Gear Services & Other Goods
Topic: Custom-built multi-bank Roland M-256/M-512 memory cards
Replies: 484
Views: 231292

Out of stock!

Aaaand we're out of stock! :blink: Well, that was quick. 120 cards are gone in a breeze. We switched the website back to the registration page you all love so much - feel free to register your email if you'd like to be notified when we have cards back in stock. I'm going to make new ones, but not b...