Whereas the sound is a Yamaha Audio Core with:
RISC CPU
DSP for real-time effects
64 sound channels
Full 3D sound support
Hardware-based audio compression
And the CD-ROM has:
1 Gbyte data storage
12x speed Constant Angular Velocity drive
The Control Pad has:
Digital and analog directional controls
Dual analog triggers
Visual Memory System data save unit
The VMS Unit has:
Energy-saving 8-bit CPU
128K byte memory
48x32 dot monochrome LCD display
37x26mm display size
Button battery x 2, auto off function
PWM 1 channel sound source
Size: 47mm(W) x 80mm(H) x 16mm(D)
Weight: 45g
And the add-on modem is a 33.6 KBytes per-second
and is upgradeable.
By-the-by, This information is all directly from
SEGA, and re-typed by a die-hard SEGA fan. (Okay, COPIED)