Roland GR-30 Guitar Synthesizer teardown

Somewhat interesting, the construction is pretty boring, but the block diagram was fun to read and it was fun to find info on the chips. A lot more going on electronically than I would have expected, which is a pleasant surprise. EEVblog Thread: http://www.eevblog.com/forum/reviews/roland-gr-30-guitar-synthesizer-teardown/ Service Manual: http://www.synfo.nl/servicemanuals/Roland/GR-30_SERVICE_NOTES.pdf CPU_A SRAM: http://pdf1.alldatasheet.com/datasheet-pdf/view/31699/TOSHIBA/TC55257DFL-70L.html CPU_B SRAM: http://pdf1.alldatasheet.com/datasheet-pdf/view/40652/SANYO/LC33832M.html Mask ROM: http://www.datasheetarchive.com/dlmain/Datasheets-309/52382.pdf CPU: http://pdf1.alldatasheet.com/datasheet-pdf/view/792/MITSUBISHI/M37702M2-127FP.html Gate Array: http://pdf1.alldatasheet.com/datasheet-pdf/view/122371/HITACHI/HG62E43.html Op-Amp: http://pdf.datasheetcatalog.com/datasheet/MitsubishiElectricCorporation/mXtqqut.pdf