[sdiy] Roland M-16C Memory Cartridge

Ullrich Peter Peter.Ullrich at kapsch.net
Mon Dec 2 16:03:51 CET 2013

In general it sounds interesting but I wouldn't make it the same way with an SRAM.
I would use a MRAM or FRAM to get rid of the battery problem.

Most MRAMs / FRAMs are also bigger so you could add a bank switch and have more banks in one cartridge.

I would use this type as the voltage can be from 2.7V to 5.5V.

Also RAM cartridges that way for the Casio CZ-Series, Kawai K3m and Yamaha DX7 are on my ToDo/Want ToDesign list...



-----Ursprüngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von Jack Jackson
Gesendet: Montag, 2. Dezember 2013 14:34
An: synth-diy at dropmix.xs4all.nl
Betreff: Re: [sdiy] Roland M-16C Memory Cartridge

I think so, this bro upgraded one from 16 to 64 by swapping out the IC http://wolzow.mindworks.ee/analog/jx-10-m-16c.htm

You want to have gold edged right, so it doesn't wear off easily and maintains good conduction?

The edge connector is just an engineering problem, but I don't think it's one that's unsolvable. One could 3D print the case. I guess the cost would be ~£10 each.

If this something people on this list would be interested in, how about collaborating to solve the remaining problems and do a small run of them?


> Date: Mon, 2 Dec 2013 14:22:27 +0100
> Subject: Re: [sdiy] Roland M-16C Memory Cartridge
> From: cheater00 at gmail.com
> To: jackdamery at hotmail.co.uk
> CC: synth-diy at dropmix.xs4all.nl
> On 2 Dec 2013 14:17, "Jack Jackson" 
> <jackdamery at hotmail.co.uk<mailto:jackdamery at hotmail.co.uk>> wrote: 
>> Are there any examples of people building replacements for these? 
> There was this bro who built lots of new memory for Yamaha synths 
> http://www.sector101.co.uk/
>> This photo shows how simple the circuits are. One TC5517APL-2 CMOS
> static RAM IC (2048 word by 8 bit), a battery, a switch, two resistors 
> and a diode.
> http://www.joness.com/gr300/pics/M-16C/Roland_M-16C_Battery_Replacemen
> t_05.JPG
>> I assume there is no configuration done to the RAM, it's done in
> parallel from the synth. You can still get the RAM chips on ebay, so I 
> presume you could build a direct clone.
> I could use some more M-64C myself. I assume it's the same thing, just 
> more RAM. The question is where to find the edge connector (looks
> nonstandard) and cartridge case (not happy with running it open, but 
> worst case you can just heatshrink).
> Cheers, 
> D. 		 	   		  
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