Presumably, any 1Mbit (128K x 8), 200ns or better, "non-JEDEC" EPROM (or comparable EEPROM) will work. Roland frequently used the Fujitsu MBM27C1000-20Z. You may already be aware of this, but if you're using a TL866-based programmer, you'll need to fashion or purchase an adapter to properly read/ …

Given that yours is an early 2.xx unit, Roland may have simply omitted the headphone jack due to needing to exhaust a remaining supply of 1.xx chassis components. That's my initial thought and it makes sense, yes. That post link has some valuable info right there. It's really hard to find that kind …

UPDATE I contacted the seller and could confirm that this is a completely original unit and it hasn't been serviced at any point. The seller is the original owner of the unit and bought it in 1988 and it was used only for a small period to compose a few samples. I imagine so because this unit it's …