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

File:Neo-d0 pinout.png

OpenOffice Draw file: File:Neo-d0.odg

Signals

• D0~D5: 68k data bus for joypad outputs
• BNK0~BNK2: Memory card upper address lines to NEO-E0
• A4: 68k address line
• 4116CS: Z80 RAM /CS
• 2610*: YM2610 control lines
• OUT1~OUT6: Joypad outputs
• SDMRD/SDMRW: Z80 ROM/RAM control lines
• SDRD0/SDRD1: Z80 port reads to NEO-ZMC in cartridge
• SDZ80*: Control lines to NEO-C1