NEO-D0
| |
| Package | QFP64R |
| Manufacturer | 
|
| First use | 1990 ? |
| Used on | MV4 and many more... |
- Clock divider
- Z80 memory and port control
- YM2610 interface
- Memory card bank selection
- Joypad outputs
Maybe similar to NEO-SUD on the NeoGeo CD. Close to the audio hardware.
Pinout
Note: The schematic has a typo and shows 4116CS instead of 6116CS.
Internal schematic
Signals
- D*: 68k data bus for joypad outputs
- BNK*: Memory card upper address lines to NEO-E0
- A4: 68k address line for decoding
- 6116CS: Z80 RAM select
- 2610*: YM2610 control outputs
- OUT*: Joypad outputs
- SDMRD: Z80 ROM/RAM read
- SDMRW: Z80 RAM write
- SDRD*: Z80 port read to NEO-ZMC in cartridge
- SDZ80CLR: Clear command code in NEO-C1
- SDZ80RD: Read command code from NEO-C1
- SDZ80WR: Write reply code to NEO-C1