- \n
- About this product<\/a>\n\n
- \n
- Compatible Hosts<\/a>\n<\/li>\n
- Parts and Function<\/a>\n<\/li>\n<\/ul>\n<\/li>\n
- Installation<\/a>\n\n
- \n
- Optional: Split Display Installation<\/a>\n<\/li>\n
- Optional: Flip Display Orientation<\/a>\n<\/li>\n<\/ul>\n<\/li>\n
- Configuration and Usage<\/a>\n\n
- \n
- Selecting Card Size<\/a>\n<\/li>\n
- Write Protection<\/a>\n<\/li>\n
- Selecting Card<\/a>\n<\/li>\n
- Usage<\/a>\n<\/li>\n<\/ul>\n<\/li>\n
- Open Source Hardware<\/a>\n<\/li>\n
- Buy-now<\/a>\n<\/li><\/ul>\n\n\n
About this product<\/h2>\n\n\n\n
![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250528_130344.jpg\")
<\/figure>\n\n\n\nThis product (P\/N: FR04) is a battery-less<\/strong> multi-bank<\/strong> RAM card based on the
dojoe<\/code><\/em> M-RAM card, with 7-seg display to show card number (orientation can be flipped), detachable display, rotary switch.<\/p>\n\n\n\nCompatible Hosts<\/h3>\n\n\n\n
This card is designed to be compatible with all Roland synthesizer which have slot for M-128\/256\/512 series RAM cards. However, not all hosts are tested. Green<\/mark> means the combination of hardware revision and host is tested to work, while orange<\/mark> means partial or complete incompatibility. Blank<\/strong> means it’s not tested but should work, feedback are welcome.<\/p>\n\n\n\n
Synthesizer<\/td> Compatibility<\/td><\/tr> A-90<\/td> Not tested<\/td><\/tr> D-5<\/td> Yes<\/mark><\/td><\/tr> D-50<\/td> Yes<\/mark><\/td><\/tr> D-550<\/td> Yes<\/mark><\/td><\/tr> D-10<\/td> Not tested<\/td><\/tr> D-110<\/td> Not tested<\/td><\/tr> D-20<\/td> Not tested<\/td><\/tr> D-70<\/td> Not tested<\/td><\/tr> GR-1<\/td> Not tested<\/td><\/tr> GR-50<\/td> Not tested<\/td><\/tr> JD-800<\/td> Yes<\/mark><\/td><\/tr> JD-990<\/td> Yes<\/mark><\/td><\/tr> JV-880<\/td> Yes<\/mark><\/td><\/tr> JV-1000<\/td> Yes<\/mark><\/td><\/tr> JV-1080<\/td> Yes<\/mark><\/td><\/tr> JV-2080<\/td> Yes<\/mark><\/td><\/tr> PM-16<\/td> Not tested<\/td><\/tr> R-880 (GC-8)<\/td> Not tested<\/td><\/tr> R-8M<\/td> Not tested<\/td><\/tr> TR-626<\/td> Not tested<\/td><\/tr> U-20<\/td> Not tested<\/td><\/tr> Akai MX-1000<\/td> Not tested<\/td><\/tr> Akai VX600<\/td> Not tested<\/td><\/tr> Roland TD-10, TD-20, Roland VG-8, Peavey Tubefex<\/td> No<\/mark><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Parts and Function<\/h3>\n\n\n\n
![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_123753.jpg\")
<\/figure>\n\n\n\nWithin the package you should have received the card itself, the handle for the rotary switch, a piece of 3M 300LSE double-sided tape, and a cable for split display connection.<\/p>\n\n\n\n
Installation<\/h2>\n\n\n\n
To avoid shipping damage the handle of the rotary switch is not mounted and you’ll need to mount it before using the card. To mount the handle, align the notch on the handle with the digit currently indicated with the arrow on the switch itself and push the handle firmly in until it sits flush.<\/p>\n\n\n\n
\n![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_123931-edited.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_180411-edited.jpg\")
<\/figure>\n\n\n\n![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_180426.jpg\")
<\/figure>\n<\/figure>\n\n\n\nOptional: Split Display Installation<\/h3>\n\n\n\n
Warning: Fiberglass content<\/mark><\/strong><\/p>\n\n\n\n
If you want to install the display onto your equipment, you can snap off the display section, connect it to t he card by using the supplied cable, and tape it to the front of your equipment by using the supplied double-sided tape. <\/p>\n\n\n\n
The supplied tape is 3M 300LSE. Do not stick onto silkscreened part to avoid damaging printed patterns. 300LSE provides high bond strength to most surfaces, including many low surface energy material. However you may want to supply your own higher or lower strength tape.<\/p>\n\n\n\n
\n![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_123959.jpg\")
Snap off display part and apply double sided tape<\/figcaption><\/figure>\n\n\n\n ![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_180350.jpg\")
Stick the display part onto your equipment<\/figcaption><\/figure>\n<\/figure>\n\n\n\n Note: Please wear glove to avoid cutting yourself. If you would like to trim the excess from snapping, please wear glove, mask and eye protection. Wet the area with water to avoid fiberglass escaping. Use vacuum cleaner to clean afterwards.<\/p>\n\n\n\n
Optional: Flip Display Orientation<\/h3>\n\n\n\n
Delicate craft work and soldering is required.<\/p>\n\n\n\n
If you want to flip the display orientation (for keyboarded synth use), there are 6 solder jumpers on the back side of the card. The center pad and default pad (indicated by little triangle) are connected by copper trace. To flip the display, you need to cut the trace (with x-acto knife or similar), and then connect the center pad with the other pad (not indicated with triangle) with solder. This will flip the display 180\u00b0.<\/p>\n\n\n\n
\n![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_183147.jpg\")
Cut trace<\/figcaption><\/figure>\n\n\n\n ![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_183441.jpg\")
Connect pad<\/figcaption><\/figure>\n\n\n\n ![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_183341.jpg\")
<\/figure>\n<\/figure>\n\n\n\nConfiguration and Usage<\/h2>\n\n\n\n
Selecting Card Size<\/h3>\n\n\n\n
You can select between 16 x 256 (M-256 equiv.) or 8 x 512 (M-512 equiv.) size bank. To change bank size you need to use an appropriate, point-headed tool to move the switch handle.<\/p>\n\n\n\n
![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250527_180547.jpg\")
<\/figure>\n\n\n\nWrite Protection<\/h3>\n\n\n\n
Whenever you would like to prevent writing to the card, you can move the “WRITE PROTECTION” switch to “WP” position.<\/p>\n\n\n\n
Please note: same as original Roland RAM card, the card does not actually inhibit writes to the card and it relies on your host synthesizer “respecting” the write protection signal. If the signal cannot be transmitted due the connector is dirty or other reasons, the write protection will fail. So try this function first.<\/p>\n\n\n\n
Selecting Card<\/h3>\n\n\n\n
The 7-segment display use 0~7 along with the dot to indicated 16 positions. To change bank, rotate the rotary switch. <\/p>\n\n\n\n
- \n
- In 256 mode, each detent represents a card, and the dot on the display is to be included. <\/li>\n<\/ul>\n\n\n\n
- \n
- In 512 mode, every 2 detent represent a card, and the dot on the display is ignored.<\/li>\n<\/ul>\n\n\n\n
- In 512 mode, every 2 detent represent a card, and the dot on the display is ignored.<\/li>\n<\/ul>\n\n\n\n
- Write Protection<\/a>\n<\/li>\n
- Optional: Flip Display Orientation<\/a>\n<\/li>\n<\/ul>\n<\/li>\n
- Parts and Function<\/a>\n<\/li>\n<\/ul>\n<\/li>\n
- Compatible Hosts<\/a>\n<\/li>\n
![\"\"](\"https:\/\/www.ddzheng.cc\/wp-content\/uploads\/2025\/05\/IMG_20250528_130322.jpg\")
<\/figure>\n\n\n\n