- Boss SY-1000 Roland showed their continuing committment to guitar synthesizers with the announcement of the new Boss SY-1000.
- Behringer Deep Mind 12 The New Roland GR-700? Vintage Sounds in a Modern Analog Synth
- GR-300 Case Rare spotting of the Original Roland GR-300 Case!
- Roland Ready Les Paul Photos of Bob Welch's Custom Shop Les Paul Paul with Roland electronics.
- Peter Frampton With Roland G-303 Thank you Eric Fisher for finding this rare live video!
- Picture This 30th Anniversary Release - Wayne Scott Jones Album from November 1989.
- Converting the M-16C into an M-64C - Detailed tips on converting the M-16C into a M-64C with four times the memory capacity!
- Roland G-33 Major Update! 18 new photos, PLUS 4 YouTube videos!
- Switch Roland-Ready MIDI Guitar Complete details on the Switch Wild-IV, PLUS all the Switch Guitars!
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- Steve Hackett - Roland GR-500/GS-500 Performance - Please Don't Touch From the 'Please Don't Touch' tour, November 8, 1978. Great GR-500 showcase!
- Vintage Roland GR-300 Review from Electronics & Music Maker - Nov 1981
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- Roland GR-700 Blue - Remake with 'GR-300' blue finish, new handles, and handsome natural wood end blocks! Thank you Chuck Nin!
- PG-200 - Updated NOS New-Old-Stock photos of the Roland PG-700, programmer for the Roland GR-700. Thank you Eric Rusack!
- G-707 White Ever wonder what a G-707 would look like redone in a brilliant white finish? With Steinberger folding leg rest!
- 3D Printing Vintage Roland Guitar Parts - 24-to-25 pin Plate - Courtesy of Jusin Casey
- David Gilmour - Solo with Roland STK-1 and GR-700!
- Moog Voyager XL (with Casio MG-510 Cameo) Space Music - Melodic Downtempo, Ambient, Ambient& PsyChill Mix.
- Roland GM-70 Guitar-to-MIDI Converter - Review by Paul White, Music Technology Magazine, April 1987
- Theme from M*A*S*H. Arranged using only the ARP Odyssey for all sounds, synths, drums, efx, etc.
- Ibanez IMG2010 - Owned by George Benson. Rare 'Endorsee' finish with Silver hardware.
Using M-64C cartridge is the only way to load/dump tones and patches on a JX-10 with factory firmware. M-64C cartridges are pretty hard to find these days and they go for obnoxious prices on eBay. At least considering the 8K of static RAM inside a small plastic box. So I acquired an M-16C which can generally be found for half the price and opened the box with the goal of converting the M-16C into an M-64C. If anyone would like to follow the same procedure here are the steps.
This is what the original M-16C circuit board looks like:
Besides the TC5517 (which is a vanilla 8 x 2K static RAM chip) the board does not contain much more. The address lines 11 and 12 required to access full 8K address space reserved for memory cartridge are not connected.
The next step is to desolder the 2K static RAM to make room for a bigger (8K) chip leaving the board even less impressive:
The main problem with substituting an 8K static RAM for a 2K one is that the larger chip has 28 pins while the original one only has 24. Consequently there are 4 holes missing on the board, therefore legs 1, 2, 27 and 28 should be bent up at 90 degrees and the narrow part cut off. Standard 2K and 8K static RAMs are almost pin-compatible so the substitution is almost straightforward - except for pin 21 (R/W) on the 2K chip. On a 8K chip A11 has taken this position so pin 23 on the 8K chip has to be bent up and trimmed as well.
TC5517APL has 250nS access time so I guess any contemporary standard 8K x 8 chip qualifies as a substitute (mine happens to be HM6264LP-70). The only suggestion here is to pick one in plastic package (the reason for this will become clear below).
Now some additional wiring has to be added to take care of the new pins (from now on the pin numbers refer to the new 8K RAM chip):
- Pin 1 is not connected to anything
- Pin 2 (A12) is wired to the edge connector on the bottom side, 2nd pin from left (the wire crosses the side through battery hole)
- Pin 23 (A11) is wired to edge connector on the component side, 2nd pin from right
- Pin 26 (CE2) is wired to Pin 28 (Vdd) with a short bridge
- in 27 (R/W) is wired to the hole beneath Pin 23 (where Pin 21 of the original chip used to be). This wire was actually soldered in place BEFORE the RAM chip itself and is located under the chip but it could be put on the bottom side if this seems easier.
The new address lines (A11 and A12) lack pull-up resistors. Fortunately there are some spare ones in the resistor arrays so two more wires are added. They connect two lowest (closer to the edge connector) legs of the centermost resistor array on the bottom side with edge connector pins (2nd one from left on the bottom side and 2nd one from right on component side, respectively). Sorry for the green wires - they are a bit hard to follow on the pictures, but look pretty in real world :)
That's it. What's left is to squeeze the modified board back into the plastic cartridge. This is a tight fit as the new RAM chip is larger. I even had to cut off some innards of the cartridge and to file some plastic off the edge of the RAM chip. This was the most complex part of this mod, no kidding, so if you don't feel comfortable with knife, file and pliers consider getting a factory M-64C instead :) Any comments and suggestions are welcome.