NEO-MGA: Difference between revisions

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NEO-MGA is a custom chip apparently noone knows (and wants to know) about, which is found in 3 versions in CD systems and some late MVS boards:
{{ChipInfo
|picture=cd1_neo-mga.jpg
|pkg=QFP160
|manu=fujitsu
|date=1994 ?
|gates=?
|used_on={{PCB|CDROM-2}}...
}}
 
NEO-MGA is a custom chip apparently noone knows about, which is found in 3 versions in CD systems and some late MVS boards:
* NEO-MGA in the CD1 model (front loading).
* 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.
* {{Chipname|NEO-MGA-T}} in the CD2 model (top loading) and {{PCB|MV1A}} MVS boards. Probably the same but made by Toshiba.
* 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 with a different pinout and maybe stuff related to the [[copy protection]] system.
 
It's used for communication between the main board and the [[CD modules|CD module]], for handling [[DRAM]] access (?), address decoding (?) and for buffering [[CDDA]] data.


<gallery>
It is used for communication between the main board and the [[CD modules|CD module]], for handling [[DRAM]] access (?), address decoding (?) and for buffering [[CDDA]] data.
cd1_neo-mga.jpg|NEO-MGA chip found in a CD1 system.
cd2_mga.jpg|NEO-MGA-T chip found in a CD2 system.
</gallery>


=Pinout=
=Pinout=
Line 15: Line 19:
[[File:Neo-mga.png]]
[[File:Neo-mga.png]]


=Pinout (NEO-MGA-T)=
1,10,15,16,18,30,41,50,59,70,81,90,110,121,130,139,150: Ground.


1,10,15,16,18,30,41,50,59,70,81,90,110,121,130,139,150: Ground.
=Signals=


[[Category:Chips]]
[[Category:Chips]]

Revision as of 10:24, 30 August 2016

File:Cd1 neo-mga.jpg
Package QFP160
Manufacturer
First use 1994 ?
Used on CDROM-2...

NEO-MGA is a custom chip apparently noone knows about, which is found in 3 versions 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 with a different pinout and maybe stuff related to the copy protection system.

It is used for communication between the main board and the CD module, for handling DRAM access (?), address decoding (?) and for buffering CDDA data.

Pinout

File:Neo-mga.png

1,10,15,16,18,30,41,50,59,70,81,90,110,121,130,139,150: Ground.

Signals

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