[sdiy] DIY Roland M-64C cartridge ?

[Bob Weigel]

Yeah I know...it's just a lot of tooling up to make a product that's 
decent looking and what's the potential volume?  Right now they're rare 
enough to where they sell for these crazy prices but once people know 
there is another source and they don't have to hoard them.... they won't 
sell for as much.   So my guess is with that and lack of nostalgic 
factor, they'll go right back to selling for 30 some dollars again like 
they were a few years ago. 

Gil W. wrote:

>Well I just got one of these M-64C and already have a M-16C here...
>
>I think I'll part them out and reverse engineer... Maybe make a few and sell over on ebay, that could be awesome as they are so rare and pricey to get  ! 
>
>;)
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>--- On Wed, 9/24/08, Bob Weigel <sounddoctorin at imt.net> wrote:
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>>From: Bob Weigel <sounddoctorin at imt.net>
>>Subject: Re: [sdiy] DIY Roland M-64C cartridge ?
>>To: gil_we at yahoo.com
>>Cc: "synth-diy at dropmix.xs4all.nl" <synth-diy at dropmix.xs4all.nl>
>>Date: Wednesday, September 24, 2008, 5:05 AM
>>I've built an attempt at making an expander for the
>>unit.  It...works to 
>>the degree that you can reliably store/retrieve patches
>>from 16 banks of 
>>memory.  I used a Cypress chip..can't recall
>>number..have more 
>>downstairs.  They are a bit of a battery hog though and you
>>have to use 
>>a good sized rechargeable to really work a decent solution
>>out on that 
>>one me thinks. 
>>
>>PROBLEM WAS when you'd try to do a bulk dump, something
>>funny would 
>>happen and I finally after building a second card and
>>having the 
>>IDENTICAL problem (It's totally predictable.  It screws
>>up the same byte 
>>of data the same way every time.  It's totally
>>consistent.  Usually bank 
>>A on an MKS70 loads fine.  Then things start gradually
>>corrupting into 
>>useless garbage) I threw my hands up.
>>
>>But recently...I thought "Hey..MKS30 doesn't do
>>bulk dump and they need 
>>a card like this even more! "  So I tested and it
>>worked fine.   So I'm 
>>getting some packaging together to release that product.  A
>>16 bank 
>>switch PLUS I should enable the other two data lines that
>>aren't used on 
>>the 16K cartridge interface that it uses so that it will
>>hold 64 banks 
>>of sounds!
>>
>>MKS30 is a great machine that lacks one thing everyone
>>would like to 
>>have.  A way to store more than 64 sounds :-)  It'd be
>>swell to have a 
>>machine that could just read/archive Roland cards for that
>>matter.   
>>Hmmm.  I guess you could do it indirectly through an MKS70
>>though.  
>>Maybe just...after backing up the 70, load the sounds from
>>the cartridge 
>>which would lack the 2 bits of course if the pins are
>>compatible 
>>otherwise..hehe... then..just midi dump the data and on
>>recalling it to 
>>the 70 and loading back onto the cartridge it might work? 
>>I dunno. 
>>Haven't checked into that thought.. -Bob
>>
>>Gil W. wrote:
>>
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>>>Is there any diagram/instructions existing for making a
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>>DIY Roland cartridge ?
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>>
>>>It seems like so many Roland vintage instruments use
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>>them...
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