the purchase of this old keyboard is the eager to teach my kidsmusic, and also got at home a good master keyboard. The GEM S-series is polyphonic aftertouch, ...
GEM S2 What better way than a MIDI keyboard to initiate kids to music!
After so many years playing guitar for leisure, I developped interest to discover other instruments, this time what trigger the purchase of this old keyboard is the eager to teach my kidsmusic, and also got at home a good master keyboard. The GEM S-series is polyphonic aftertouch, and contrary to other big name in music it is affordable and provide music player a lot of satisfaction. As an old piece of hardware of 90's, a first cleaning operation let me discover the inner parts of the beast. The rotary switch after disassembly and remove grease on contact came back to life, no more crazy jump in menu. I then start to play with the few floppy disk provided with the unit, and notice soon or later I would have no more working floppy disk, I start to search solution to replace floppy drive EPSON SMD 300. A cheap product GOTEK floppy emulator seems to flood the market for Amiga/Atari computers and lot of old MIDI keyboardas well. Although GEM S2/S3/S2R use a special format of 1.6MB, I tried the GOTEK floppy emulator and succeed to make it works. I flashed firmware FlashFloppy as I wanted several option such as OLED display.
Keep in mind jumper setting shall be setup as floppy drive 0. The first try with disk image format IMG didn't work, but as soon as I converted to HFE file with the correct bitrate everthing worked great.
Once the floppy emulator installed, I tried many sounds. I also found sample_translator disk tool interesting, it let the oportunity to import WAV and AKAI, and extend Midi usage with SDS . I wish the synth could always got those feature and notice the TurboKit would do it. After several weeks of readings, and helps from community to collect other information, I realized I should design and produce the board. I decided to remove unused SCSI connector as there is no hope to implement software for this kind of out dated feature. I managed to transform the design into a square PCB.
Original design:
New design:
Waiting to receive PCB, I noticed on motherboard of GEM S2 there is IC66 another EEPROM, I think I should dump it before future transition, I encounter few trouble while unsoldering, a pin (GND) get out of package, hopefully I manage to fix it again and add it on top of DIP socket. Synth is still working, it will let me enough time to dump content before next step.
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