[sdiy] Roland M-16C Memory Cartridge

[Jack Jackson]

Schematic right here:
http://www.joness.com/gr300/service/M-16C_SERVICE_NOTES.pdf
----------------------------------------
> From: jackdamery at hotmail.co.uk
> To: synth-diy at dropmix.xs4all.nl
> Date: Mon, 2 Dec 2013 13:33:46 +0000
> Subject: 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?
>
> Cheers,
> Jack
>
> ________________________________
>> 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_Replacement_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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