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, can be swapped with NEO-MGA.
- NEO-MGA2-SA in the CDZ, replaces the LC8953 ?
It is used for address decoding, communication with the CD drive, for refreshing 68k 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.