Revision as of 07:34, 11 May 2018

Multi-purpose chip found in CD systems and some late MVS boards:

NEO-MGA in the CD1 model (front loading).
NEO-MGA-T in the CD2 model (top loading) and MV1A MVS boards. Probably the same but made by Toshiba.
NEO-MGA-T2 in the CDZ, probably the exact same chip made with a different pinout or manufacturing process.

It is used for address decoding, communication with the CD drive, for refreshing 68k DRAM, and for buffering serial CDDA data.

CD pinout

@@ Line 8: / Line 8: @@
 }}
-NEO-MGA is found in CD systems and some late MVS boards:
+Multi-purpose chip found in CD systems and some late MVS boards:
 * NEO-MGA in the CD1 model (front loading).
 * {{Chipname|NEO-MGA-T}} in the CD2 model (top loading) and {{PCB|MV1A}} MVS boards. Probably the same but made by Toshiba.
-* {{Chipname|NEO-MGA-T2}} in the [[CDZ]], probably with a different pinout and maybe stuff related to the [[copy protection]] system.
+* {{Chipname|NEO-MGA-T2}} in the [[CDZ]], probably the exact same chip made with a different pinout or manufacturing process.
-It is used for communication with the [[CD drive]], for handling {{Chipname|68k}} program and work [[DRAM]] access, some address decoding and for buffering serial [[CDDA]] data.
+It is used for address decoding, communication with the [[CD drive]], for refreshing {{Chipname|68k}} [[DRAM]], and for buffering serial [[CDDA]] data.
-=Pinout=
+=CD pinout=
-[[File:Neo-mga_pinout.png|700px]]
+[[File:Neo-mga_CD_pinout.png|700px]]
-[[File:Neo-mga.odg]]
+[[File:Neo-mga_cd.odg]]
+=MV1A pinout=
+[[File:Neo-mga_MV1A_pinout.png|700px]]
+[[File:Neo-mga_mv1a.odg]]
 =Signals=