NEO-MGA
| File:Cd1 neo-mga.jpg | |
| Package | QFP160 |
| Manufacturer | 
|
| First use | 1994 ? |
| Used on | CDROM-2 board, MV1A... |
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
MV1A pinout
Signals
- DRM*, RAS, CAS, WRITE: See TC514400 DRAM datasheet.
- X*: See LC8953 datasheet.