This is a video of the awesome Roland MC-202, the Roland SH-101 with a sequencer. The SH-101, if you don't know is a little tiny battery powered synthesizer that has AMAZING sound. The sad thing is if you saw it in a pawn shop somewhere you could mistake it for an older Yamaha PSR, but the SH-101 and the MC-202 are powerful.
Listen as the MC-202 starts out doing basic TB-303 acid stuff, than later moves into NES and C64 territory: