NEO-MGA

Multi-purpose chip found in CD systems and some late MVS boards:
 * NEO-MGA in the CD1 model (front loading).
 * in the CD2 model (top loading) and MVS boards, can be swapped with NEO-MGA.
 * in the CDZ, replaces the ?

It is used for address decoding, communication with the CD drive, for refreshing DRAM, and for buffering serial CDDA data.

=CD pinout=

Pin 93: GND !





=MV1A pinout=





=Signals=


 * DRM*, RAS, CAS, WRITE: See TC514400 DRAM datasheet.
 * X*: See LC8953 datasheet.