Finally! That’s great! I was waiting for something like this 31 years :-) Merci beaucoup.
Depending on the price I could be interested in such cart. If only you offer also programming that EPROM from SysEx data for 128 DX7 banks sent by customer. I haven’t possibility to do it myself.
Do you plan to make such cart also fir DX7 II D/FD and other machines using RAM4/5 cards, or SY99 and other Yamaha instruments using MCD32/64 cards?
BTW, do you know that some similar interesting devices are produced by Brian at Sector101? ?Check his page.
Daniel Forro
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[Attachment(s)?from?christophe.perrod@...?[YamahaDX] included below]?Hi everybody,I was fed up to boot the computer each time I wanted to try a new SYSEX...so I designed a ROM card for the DX7 built around a 27C801 EPROM ( 1MB ) and ended up with a perfectly working device able to store 256 x 32 = 4096 patches...whereof to stay awake late in the night before needing to erase and burn the EPROM again....There's no mystery in my design, based upon the original ROM card circuitry supplied by Yamaha, which I extended the adressing bus with 8 additional lines controlled by DIP switches for highest adress bits, allowing selection of one of the 256 banks.I had to write a ( rough for now ) Python script to extract datas from SYSEXes ( basically to remove the MIDI-dedicated bytes ) and to build the .bin file to be sent to the EPROM programmer. For now, I filled the ROM to the brim with 256 SYSEXes picked up at random ;-)As said, the prototype seems to work very well ( though I didn't test every single patch....)If someone is interested in such a device, I can launch a batch at OSH Park for PCBs and send them once I've received them. I can also supply rightly programmed 27C801 EPROM, or even a complete kit with all the components ( a few indeed ). Let me know !I attach to this message pictures of the card and the script I used ( in French, sorry....).Chris.
