Happy to answer any questions or send additional photos.
Includes two expansion cards!
1) Roland+Spectrasonics' Bass+Drums expansion board - features a large quantity of electric/acoustic basses, and acoustic drums.
2) M256E 16x multi-bank RAM card
16 position rotary knob on the card, allowing 16x times M256 card capacity.
Each switch position represents the entire memory available on a M256 card. You can switch banks while the card is inserted in your Roland instrument.
(I never actually got around to using it, but it's cool!)
The JD-990 is an enhanced version of the JD-800 and was the top o' the line JD-synth. Its rack-mount design and impressive power and functionality within the studio paved way for the hugely successful JV-series rack modules which lead, ultimately, to the XV-series monster-modules! The JD-990 is a digital synth with 6MB of ROM sounds with "analog-like" edit parameters and features. These include lowpass filtering, ring modulation, osc. sync, frequency cross-mod, etc. The JD-990 is also compatible with JV80 and JD800 expansion boards.